Asus Computer Hardware B75MA User Manual

B75M-A  
 
Contents  
Chapter 1:  
iii  
Contents  
1.10.3 Intel® SBA support ........................................................ 1-34  
Chapter 2:  
iv  
Contents  
v
Safety information  
Electrical safety  
To prevent electrical shock hazard, disconnect the power cable from the electrical outlet  
before relocating the system.  
When adding or removing devices to or from the system, ensure that the power cables  
for the devices are unplugged before the signal cables are connected. If possible,  
disconnect all power cables from the existing system before you add a device.  
Before connecting or removing signal cables from the motherboard, ensure that all  
power cables are unplugged.  
Seek professional assistance before using an adapter or extension cord. These devices  
could interrupt the grounding circuit.  
Ensure that your power supply is set to the correct voltage in your area. If you are not  
sure about the voltage of the electrical outlet you are using, contact your local power  
company.  
If the power supply is broken, do not try to fix it by yourself. Contact a qualified service  
technician or your retailer.  
Operation safety  
Before installing the motherboard and adding components, carefully read all the manuals  
that came with the package.  
Before using the product, ensure all cables are correctly connected and the power  
cables are not damaged. If you detect any damage, contact your dealer immediately.  
To avoid short circuits, keep paper clips, screws, and staples away from connectors,  
slots, sockets and circuitry.  
Avoid dust, humidity, and temperature extremes. Do not place the product in any area  
where it may be exposed to moisture.  
Place the product on a stable surface.  
If you encounter technical problems with the product, contact a qualified service  
technician or your retailer.  
About this guide  
This user guide contains the information you need when installing and configuring the  
motherboard.  
How this guide is organized  
This guide contains the following parts:  
Chapter 1: Product introduction  
This chapter describes the features of the motherboard and the new technology it  
supports. It includes descriptions of the switches, jumpers, and connectors on the  
motherboard.  
Chapter 2: BIOS information  
This chapter discusses changing system settings through the BIOS Setup menus.  
Detailed descriptions fo the BIOS parameters are also provided.  
vi  
 
Where to find more information  
Refer to the following sources for additional information and for product and software  
updates.  
1.  
2.  
ASUS websites  
The ASUS website provides updated information on ASUS hardware and software  
products. Refer to the ASUS contact information.  
Optional documentation  
Your product package may include optional documentation, such as warranty flyers,  
that may have been added by your dealer. These documents are not part of the  
standard package.  
Conventions used in this guide  
To ensure that you perform certain tasks properly, take note of the following symbols used  
throughout this manual.  
DANGER/WARNING: Information to prevent injury to yourself when  
completing a task.  
CAUTION: Information to prevent damage to the components when  
completing a task  
IMPORTANT: Instructions that you MUST follow to complete a task.  
NOTE: Tips and additional information to help you complete a task.  
Typography  
Bold text  
Italics  
Indicates a menu or an item to select.  
Used to emphasize a word or a phrase.  
<Key>  
Keys enclosed in the less-than and greater-than sign  
means that you must press the enclosed key.  
Example: <Enter> means that you must press the Enter or  
Return key.  
<Key1> + <Key2> + <Key3> If you must press two or more keys simultaneously, the key  
names are linked with a plus sign (+).  
vii  
B75M-A specifications summary  
CPU  
LGA1155 socket for Intel® 3rd / 2nd Generation Core™ i7 / i5 / i3, Pentium®  
and Celeron® processors  
Supports Intel® 22/32nm CPU  
Supports Intel® Turbo Boost Technology 2.0  
* The Intel® Turbo Boost Technology 2.0 support depends on the CPU types.  
** Refer to www.asus.com for Intel® CPU support list.  
Chipset  
Memory  
Intel® B75 Express Chipset  
2 x DIMM, max. 16GB, DDR3 2200(O.C.) / 2000(O.C.) /1800 (O.C.) / 1600 /  
1333 / 1066 MHz, non-ECC, un-buffered memory  
Dual-channel memory architecture  
* Refer to www.asus.com for the latest Memory QVL (Qualified Vendors List).  
** When you install a total memory of 4GB capacity or more, Windows® 32-bit  
operating system may only recognize less than 3GB. We recommend a  
maximum of 3GB system memory if you are using a Windows® 32-bit operating  
system.  
*** Intel® 3rd generation processors support DDR3 1600 MHz and higher frequency.  
Graphics  
Integrated graphics processor  
Multi-VGA output support: HDMI, DVI-D, and D-Sub ports  
- Supports HDMI with max.resolution of 1920 x 1200 @60Hz  
- Supports DVI-D with max.resolution of 1920 x 1200 @60Hz  
- Supports D-Sub with max. resolution of 2048 x 1536 @75Hz  
Maximum shared memory of 1 GB  
1 x PCI Express 3.0/2.0 x16 slot  
2 x PCI Express 2.0 x1 slots  
1 x PCI slot  
Expansion slots  
Storage  
Intel® B75 Express Chipset:  
- 5 x Serial ATA 3.0 Gb/s connectors (blue)  
- 1 x Serial ATA 6.0 Gb/s connector (gray)  
Realtek® 8111F-VB-CG Gigabit LAN controller  
LAN  
Audio  
6+2 Channels Realtek® ALC887-VD High Definition Audio CODEC  
-
Supports jack-detection, multi-streaming, anti-pop function, and front  
panel jack-retasking  
*
Use a chassis with HD audio module in the front panel to support an 8-channel  
audio output.  
USB  
4 x USB 3.0 ports (2 ports at midboard, 2 ports at back panel)  
8 x USB 2.0 ports (4 ports at midboard, 4 ports at back panel)  
(continued on the next page)  
viii  
 
B75M-A specifications summary  
ASUS unique features  
ASUS Exclusive Features:  
- ASUS USB 3.0 Boost  
- ASUS Network iControl  
- ASUS AI Suite II  
- ASUS AI Charger  
- ASUS Anti-Surge Protection  
- ASUS UEFI BIOS  
ASUS Quiet Thermal Solution:  
- ASUS Fan Xpert  
ASUS EZ DIY:  
- ASUS CrashFree BIOS 3  
- ASUS EZ Flash 2  
- ASUS MyLogo 2™  
Other features  
- 100% All high-quality conductive polymer capacitors  
Rear panel I/O ports  
1 x PS/2 keyboard port (purple)  
1 x PS/2 mouse port (green)  
1 x HDMI port  
1 x DVI-D port  
1 x D-Sub port  
1 x LAN (RJ-45) port  
4 x USB 2.0/1.1 ports  
2 x USB 3.0 ports  
3 x Audio jacks  
Internal connectors/  
switches/ buttons  
1 x USB 3.0 connector supports additional 2 USB 3.0 ports  
2 x USB 2.0 connectors support additional 4 USB 2.0 ports  
5 x SATA 3.0 Gb/s connectors  
1 x SATA 6.0 Gb/s connector  
1 x CPU fan connector  
1 x Chassis fan connectors  
1 x Front panel audio connector (AAFP)  
1 x System panel connector  
1 x Speaker connector  
1 x 24-pin ATX power connector  
1 x 4-pin ATX 12V power connector  
(continued on the next page)  
ix  
B75M-A specifications summary  
BIOS features  
128 Mb Flash ROM, AMI BIOS, PnP, DMI2.0, WfM2.0, SM BIOS 2.5,  
ACPI 2.0a, Multi-language BIOS, ASUS EZ Flash 2, ASUS CrashFree  
BIOS 3  
Manageability  
Support DVD  
WfM 2.0, DMI 2.0, WOL by PME, WOR by PME, PXE  
Drivers  
ASUS utilities  
ASUS Update  
Anti-virus software (OEM version)  
Form factor  
MicroATX form factor: 9.6”x 7.0” (24.4cm x 17.8cm)  
Specifications are subject to change without notice.  
x
Package contents  
Check your motherboard package for the following items.  
DVI_VGA  
L G A 1 1 5 5  
DDR3 DIMM_A1 (64bit, 240-pin module)  
DDR3 DIMM_B1 (64bit, 240-pin module)  
SATA3G_5 SATA3G_3 SATA3G_1  
EATXPWR  
SATA6G_1  
SATA3G_4 SATA3G_2  
1 x Serial ATA 3.0Gb/s cable  
1 x Serial ATA 6.0Gb/s cable  
ASUS B75M-A motherboard  
User Manual  
1 x I/O-Shield  
User Guide  
Support DVD  
If any of the above items are damaged or missing, contact your retailer.  
The illustrated items above are for reference only. Actual product specifications may  
vary with different models.  
xi  
 
xii  
Product introduction  
1
1.1  
Special features  
Product highlights  
1.1.1  
LGA1155 socket for Intel® 3rd/2nd Generation Core™ i7 / Core™ i5 / Core™  
i3 processors  
This motherboard supports the Intel® 3rd/2nd generation Core™ i7 / Core™ i5 / Core™ i3  
processors in the LGA1155 package It provides great graphics performance with its iGPU,  
dual-channel DDR3 memory slots, and PCI Express 2.0/3.0 slots.  
Intel® B75 Express Chipset  
The Intel® B75 Express Chipset is the latest single-chipset designed to support the 1155  
socket Intel® 3rd/2nd generation Core™ i7 / Core™ i5 / Core™ i3 processors. It provides  
improved performance by utilizing serial point-to-point links, allowing increased bandwidth  
and stability. In addition, B75 chipset provides 4 USB 3.0 ports that retrieves data 10 times  
faster. Moreover, Intel® B75 Express Chipset also supports iGPU function, letting users enjoy  
the latest Intel integrated graphic performance.  
Dual-Channel DDR3 2200 (O.C.)*/ 2000 (O.C.) / 1800 (O.C.) / 1600 / 1333 / 1066  
MHz support  
The motherboard supports DDR3 memory that features data transfer rates of 2200 (O.C.)/  
2000 (O.C.) / 1800 (O.C.) / 1600 / 1333 / 1066 MHz to boost the system’s performance, and  
to meet the higher bandwidth requirements of the latest 3D graphics, multimedia, and Internet  
applications.  
*
Intel® 3rd generation processors support DDR3 1600 MHz and higher frequency.  
1.1.2  
ASUS Exclusive features  
Native SATA 6.0 Gb/s support  
With Intel® B75 Express Chipset native support for the next-generation Serial ATA (SATA)  
storage interface, this motherboard delivers up to 6.0 Gb/s data transfer rates. It also  
provides enhanced scalability, faster data retrieval, and double the bandwidth of current bus  
systems.  
1-1  
ASUS B75M-A  
Complete USB 3.0 Integration  
This motherboard offers you the strategic USB 3.0 accessibility for both the front and rear  
panels, allowing you to experience the convenience of the latest plug and play connectivity  
solution at speed up to ten times faster than USB 2.0.  
PCI Express® 3.0  
PCI Express® 3.0 (PCIe 3.0) is the PCI Express bus standard that provides twice the  
performance and speed of PCIe 2.0. It provides an optimal graphics performance,  
unprecedented data speed, and seamless transition with its complete backward compatibility  
to PCIe 1.0/2.0 devices.  
* Intel® 3rd generation Core™ processors support PCIe 3.0  
ASUS UEFI BIOS (EZ Mode)  
ASUS UEFI BIOS, a UEFI compliant architecture, offers the first mouse-controlled intuitive  
graphical BIOS interface that goes beyond the traditional keyboard-only BIOS controls,  
providing you with more flexibility, convenience, and easy to navigate EFI BIOS than the  
traditional BIOS versions. It offers you with dual selectable modes and native support for hard  
drives larger than 2.2 TB.  
ASUS UEFI BIOS includes the following new features:  
F12 BIOS snapshot hotkey  
F3 Shortcut for most accessed information  
ASUS DRAM SPD (Serial Presence Detect) information detecting faulty DIMMs, and  
helping with difficult POST situations.  
Ai Charger  
Ai Charger is a unique fast-charging software that supports iPods, iPhones, and iPads.  
* Check your USB mobile device if it fully supports the BC 1.1 function.  
** The actual charging speed may vary with your USB device’s conditions.  
*** Ai Charger is only supported when you set the USB device wake-up jumpers to +5VSB. See section 1.7 Jumpers  
for details.  
USB 3.0 Boost  
With USB 3.0 Boost technology, a USB device’s transmission speed is significantly  
increased, adding to an already impressive USB 3.0 transfer speed. ASUS software  
automatically accelerates data speeds for compatible USB 3.0 peripherals without the need  
for any user interaction.  
AI Suite II  
With its user interface, ASUS AI Suite II integrates several ASUS utilities and allows you to  
launch and operate these utilities simultaneously. It allows you to configure the overclocking  
settings, adjust the frequencies and related voltages, remotely control the system via a  
mobile device, and other easy-to-use helpful utilities.  
1-2  
Chapter 1: Product introduction  
ASUS MyLogo 2™  
This feature allows you to convert your favorite photo into a 256-color boot logo for a more  
colorful and vivid image on your screen.  
ASUS CrashFree BIOS 3  
ASUS CrashFree BIOS 3 is an auto-recovery tool that allows you to restore a corrupted BIOS  
file using the bundled support DVD or USB flash disk that contains the latest BIOS file.  
ASUS Fan Xpert  
ASUS Fan Xpert intelligently allows you to adjust both the CPU and chassis fan speeds  
based on different ambient temperatures, resulting to a quiet and cool computing  
environment.  
Network iControl  
Network iControl is an intuitive one-step network control center that makes it easier for you to  
manage your bandwidth and allows you to set, monitor, and schedule the bandwidth priorities  
for your network programs. It allows you to automatically connect to a PPPoE network for a  
more convenient online experience.  
ASUS Anti-Surge Protection  
This special design prevents expensive devices and the motherboard from damage caused  
by power surges from switching power supply (PSU).  
C.P.R. (CPU Parameter Recall)  
The BIOS C.P.R. feature automatically restores CPU default settings when the system  
crashes due to overclocking failure. C.P.R. eliminates the need to open the system  
chassis and clear the RTC data. Simply shut down and reboot the system, and the BIOS  
automatically restores the CPU parameters to their default settings.  
ErP ready  
This motherboard is European Union´s Energy-related Products (ErP) ready, and ErP  
requires products to meet certain energy efficiency requirements with regard to energy  
consumption. This is in line with ASUS’ vision of creating environment-friendly and energy-  
efficient products through product design and innovation aimed at reducing carbon footprint  
and mitigating environmental impact.  
1-3  
ASUS B75M-A  
1.2  
Before you proceed  
Take note of the following precautions before you install motherboard components or change  
any motherboard settings.  
Unplug the power cord from the wall socket before touching any component.  
Before handling components, use a grounded wrist strap or touch a safely grounded  
object or a metal object, such as the power supply case, to avoid damaging them due  
to static electricity.  
Hold components by the edges to avoid touching the ICs on them.  
Whenever you uninstall any component, place it on a grounded antistatic pad or in the  
bag that came with the component.  
Before you install or remove any component, ensure that the ATX power supply is  
switched off or the power cord is detached from the power supply. Failure to do so  
may cause severe damage to the motherboard, peripherals, or components.  
1.3  
Motherboard overview  
Before you install the motherboard, study the configuration of your chassis to ensure that the  
motherboard fits.  
Unplug the power cord before installing or removing the motherboard. Failure to do so can  
cause you physical injury and damage to motherboard components.  
1.3.1  
Placement direction  
When installing the motherboard, place it into the chassis in the correct orientation. The edge  
with external ports goes to the rear part of the chassis as indicated in the image.  
1-4  
Chapter 1: Product introduction  
1.3.2  
Screw holes  
Place six screws into the holes indicated by circles to secure the motherboard to the chassis.  
Do not overtighten the screws! Doing so can damage the motherboard.  
B75M-A  
Place this side  
towards the rear  
of the chassis  
1-5  
ASUS B75M-A  
1.3.3  
Motherboard layout  
1
2
3
4
5
4
6
17.8cm(7.0in)  
PS2_USBPW34  
KBMS  
CPU_FAN  
DIGI  
+VRM  
USB34  
ATX12V  
HDMI  
USBPW12  
2
USB3_12  
LAN1_USB12  
AUDIO  
BATTERY  
B75M-A  
PCIEX16  
CHA_FAN  
RTL  
8111F  
7
PCIEX1_1  
PCIEX1_2  
Intel®  
B75  
Super  
I/O  
128Mb  
BIOS  
8
9
ALC  
887  
PCI1  
USB56  
SB_PWR  
USB78  
USB3_34  
SPEAKER  
CLRTC  
USBPW5-8  
15  
AAFP  
F_PANEL  
13  
1
12  
11 10  
14  
1-6  
Chapter 1: Product introduction  
1.3.4  
Layout contents  
Connectors/Jumpers/Slots/LED  
Page  
1. USB device wake-up (USBPW12)  
1-22  
2. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)  
3. P/S 2 device wakeup (PS_USBPW34)  
1-26  
1-21  
1-27  
1-8  
4. CPU and chassis fan connectors (4-pin CPU_FAN, 4-pin CHA_FAN)  
5. Intel® LGA1155 CPU socket  
6. DDR3 DIMM slots  
1-13  
1-29  
1-30  
1-30  
1-28  
1-29  
1-31  
1-32  
1-20  
1-25  
7. Intel® B75 Serial ATA 3.0Gb/s connectors (7-pin SATA3G_1~5 [blue])  
8. Intel® B75 Serial ATA 6.0Gb/s connector (7-pin SATA6G_1 [gray])  
9. USB 3.0 connector (20-1 pin USB3_34)  
10. System panel connector (10-1 pin F_PANEL)  
11. Speaker connector (4-pin SPEAKER)  
12. USB 2.0 connectors (10-1 pin USB56, USB78)  
13. Onboard LED (SB_PWR)  
14. Clear RTC RAM (3-pin CLRTC)  
15. Front panel audio connector (10-1 pin AAFP)  
1-7  
ASUS B75M-A  
1.4  
Central Processing Unit (CPU)  
This motherboard comes with a surface mount LGA1155 socket designed for the Intel  
3rd/2nd generation Core™ i7 / Core™ i5 / Core™ i3 / Pentium® / Celeron® processors.  
B75M-A  
B75M-A CPU socket LGA1155  
Unplug all power cables before installing the CPU.  
Upon purchase of the motherboard, ensure that the PnP cap is on the socket and  
the socket contacts are not bent. Contact your retailer immediately if the PnP cap  
is missing, or if you see any damage to the PnP cap/socket contacts/motherboard  
components. ASUS will shoulder the cost of repair only if the damage is shipment/  
transit-related.  
Keep the cap after installing the motherboard. ASUS will process Return Merchandise  
Authorization (RMA) requests only if the motherboard comes with the cap on the  
LGA1155 socket.  
The product warranty does not cover damage to the socket contacts resulting from  
incorrect CPU installation/removal, or misplacement/loss/incorrect removal of the PnP  
cap.  
1-8  
Chapter 1: Product introduction  
1.4.1  
Installing the CPU  
The LGA1156 CPU is incompatible with the LGA1155 socket. DO NOT install a LGA1156  
CPU on the LGA1155 socket.  
1
A
B
3
2
1-9  
ASUS B75M-A  
4
C
A
B
5
1-10  
Chapter 1: Product introduction  
1.4.2  
CPU heatsink and fan assembly installation  
Apply the Thermal Interface Material  
to the CPU heatsink and CPU  
before you install the heatsink and  
fan if necessary.  
To install the CPU heatsink and fan assembly  
A
1
2
B
B
A
3
4
1-11  
ASUS B75M-A  
To uninstall the CPU heatsink and fan assembly  
1
2
A
B
B
A
1-12  
Chapter 1: Product introduction  
1.5  
System memory  
Overview  
1.5.1  
This motherboard comes with two Double Data Rate 3 (DDR3) Dual Inline Memory Module  
(DIMM) sockets. A DDR3 module has the same physical dimensions as a DDR2 DIMM but  
is notched differently to prevent installation on a DDR2 DIMM socket. DDR3 modules are  
developed for better performance with less power consumption. The figure illustrates the  
location of the DDR3 DIMM sockets:  
Channel  
Sockets  
Channel A  
Channel B  
DIMM_A1  
DIMM_B1  
B75M-A  
B75M-A 240-pin DDR3 DIMM sockets  
1-13  
ASUS B75M-A  
1.5.2  
Memory configurations  
You may install 1GB, 2GB, 4GB, and 8GB unbuffered non-ECC DDR3 DIMMs into the DIMM  
sockets.  
You may install varying memory sizes in Channel A and Channel B. The system maps  
the total size of the lower-sized channel for the dual-channel configuration. Any excess  
memory from the higher-sized channel is then mapped for single-channel operation.  
Always install DIMMs with the same CAS latency. For optimal compatibility, we  
recommend that you install memory modules of the same version or date code (D/C)  
from the same vendor. Check with the retailer to get the correct memory modules.  
Due to the memory address limitation on 32-bit Windows® OS, when you install 4GB  
or more memory on the motherboard, the actual usable memory for the OS can be  
about 3GB or less. For effective use of memory, we recommend that you do any of the  
following:  
-
-
Use a maximum of 3GB system memory if you are using a 32-bit Windows® OS.  
Install a 64-bit Windows® OS if you want to install 4GB or more on the  
motherboard.  
This motherboard does not support DIMMs made up of 512 megabits (Mb) chips or  
less.  
Memory modules with memory frequency higher than 2133 MHz and its corresponding  
timing or the loaded X.M.P. Profile is not the JEDEC memory standard. The stability  
and compatibility of these memory modules depend on the CPU’s capabilities and  
other installed devices.  
The maximum 16GB memory capacity can be supported with 8GB or above DIMMs.  
ASUS will update the memory QVL once the DIMMs are available in the market.  
The default memory operation frequency is dependent on its Serial Presence Detect  
(SPD), which is the standard way of accessing information from a memory module.  
Under the default state, some memory modules for overclocking may operate at a  
lower frequency than the vendor-marked value. To operate at the vendor-marked  
or at a higher frequency, refer to section 2.4 Ai Tweaker menu for manual memory  
frequency adjustment.  
For system stability, use a more efficient memory cooling system to support a full  
memory load (2 DIMMs) or overclocking condition.  
1-14  
Chapter 1: Product introduction  
B75M-A Motherboard Qualified Vendors Lists (QVL)  
SS: Single-sided / DS: Double-sided  
DIMM support:  
1 DIMM: Supports one module inserted into either slot as single-channel memory  
configuration.  
2 DIMMs: Supports one pair of modules inserted into both the blue slots as one  
pair of dual-channel memory configuration.  
Intel® 3rd generation processors support DDR3 1600 MHz and higher memory  
frequency.  
Due to Intel® 3rd generation processors' behavior, DDR3 2250 (and above)/2133/1866  
MHz memory module will run at DDR3 2200/2000/1800 MHz frequency as default.  
DDR3-2400 MHz capability  
DIMM socket  
Chip  
Brand  
support (optional)  
Vendors  
Part No.  
Size  
SS/DS  
Chip No. Timing  
Voltage  
1DIMM  
2DIMMs  
KINGSTON KHX2400C11D3K4/8GX(XMP)  
Team TXD38G2400HC10QBK  
8GB (4GBx2)  
8GB  
SS  
DS  
-
-
-
-
-
1.65V  
10-12-12-31 1.65V  
DDR3-2200 (O.C.) MHz capability  
DIMM socket  
Chip  
Brand  
support (optional)  
Vendors  
Part No.  
Size  
SS/DS  
Chip No. Timing  
Voltage  
1DIMM  
2DIMMs  
GEIL  
GET34GB2200C9DC(XMP)  
2GB  
2GB  
DS  
DS  
-
-
-
-
9-10-9-28  
-
1.65V  
-
KINGMAX  
FLKE85F-B8KJAA-FEIS(XMP)  
DDR3-2133 MHz capability  
DIMM socket  
Chip  
Brand  
support (optional)  
Vendors  
Part No.  
Size  
SS/DS  
Chip No. Timing  
Voltage  
1DIMM  
2DIMMs  
KINGSTON KHX2133C11D3K4/16GX(XMP)  
ADATA AX3U2133XW8G10-2X(XMP)  
16GB (4GB x4) DS  
-
-
-
-
-
1.65V  
8GB  
DS  
10-11-11-30 1.65V  
DDR3-2000 (O.C.) MHz capability  
DIMM socket  
Chip  
Brand  
support (optional)  
Vendors  
Part No.  
Size  
SS/DS  
Chip No. Timing  
Voltage  
1DIMM  
2DIMMs  
Apacer  
78.AAGD5.9KD(XMP)  
6GB (3 x 2GB) DS  
4GB (2x 2GB) DS  
-
-
-
-
9-9-9-27  
-
1.65V  
1.65V  
KINGSTON KHX2000C9AD3T1K2/4GX(XMP)  
1-15  
ASUS B75M-A  
DDR3-1066 MHz capability  
DIMM socket  
Chip  
Brand  
support (optional)  
Vendors  
Part No.  
Size  
SS/DS  
Chip No.  
Timing  
Voltage  
1DIMM  
2DIMMs  
Crucial  
CT25664BA1067.16FF  
2GB  
2GB  
DS  
DS  
Micron  
9HF22D9KPT  
7
-
-
J1108BFSE-  
DJ-F  
KINGSTON KVR1066D3N7/2G  
ELPIDA  
1.5V  
DDR3-1866 MHz capability  
DIMM socket  
Chip  
Brand  
support (optional)  
Vendors  
Part No.  
Size  
SS/DS  
Chip No. Timing  
Voltage  
1DIMM  
2DIMMs  
CRUCIAL  
BLT4G3D1869DT1TX0.13FKD(XMP) 4GB  
DS  
-
-
-
-
9-9-9-27  
-
1.5V  
KINGSTON KHX1866C9D3K4/16GX(XMP)  
16GB (4GB x4) DS  
1.65V  
DDR3-1600 MHz capability  
DIMM socket support  
(Optional)  
SS/  
Vendors  
Part No.  
Size  
Chip Brand  
DS  
Chip No.  
Timing  
Voltage  
1 DIMM  
2 DIMM  
APACER  
4GB UNB PC3-  
12800  
4GB  
SS  
APACER  
AM5D6008  
BQQSCK  
-
-
CL11  
CORSAIR  
Crucial  
CMD12GX3M6  
A1600C8(XMP)  
12GB  
(6x2GB)  
DS  
DS  
-
-
-
-
8-8-8-24  
-
1.65V  
-
BL25664BN  
1608.16FF(XMP)  
6GB  
(3 x  
2GB)  
KINGSTON  
KHX1600C9D3  
K4/16GX(XMP)  
16GB  
(4GB  
x4 )  
DS  
-
-
-
1.65V  
KINGSTON  
PSC  
KVR16N11/4  
4GB  
4GB  
8GB  
8GB  
4GB  
8GB  
DS  
SS  
DS  
DS  
DS  
DS  
KINGSTON  
D2568GE  
ROPGGBU  
-
1.5V  
AL9F8L93B-  
GN2E  
PSC  
XHP284  
C3G-M  
-
-
Transcend  
ADATA  
TEAM  
8G DDR3 1600  
DIMM CL11  
Transcend  
E223X8B  
O648S  
-
-
-
AD3U1600W  
8G11-B  
ADATA  
F211X8  
B0640A  
-
1.5V  
-
TLD34G1600H  
C9BK(XMP)  
-
-
-
-
9-9-24  
Team  
TED38G1600  
HC11BK  
11-11-  
11-28  
1-16  
Chapter 1: Product introduction  
DDR3-1333 MHz capability  
DIMM socket  
support (Optional)  
SS/  
DS  
Chip  
Brand  
Vendors  
Part No.  
Size  
Chip No.  
Timing  
Voltage  
2
1 DIMM  
DIMM  
A-DATA  
Apacer  
AD3U1333  
C2G9  
2GB  
SS  
DS  
DS  
A-DATA  
Apacer  
-
3CCD-1509HN  
A1126L  
-
-
-
AU02GFA33  
C9NBGC  
2GB  
AM5D5808  
APQSBG  
-
CORSAIR  
CMD8GX3  
M4A1333C7  
8GB  
(4 x  
2GB)  
-
-
-
7-7-7-20  
7-7-7-24  
7-7-7-21  
9-9-9-24  
1.60V  
Crucial  
G.SKILL  
GEIL  
BL25664BN  
1337.16FF  
(XMP)  
6GB  
(3 x  
2GB)  
DS  
DS  
DS  
-
1.65V  
1.5V  
F3-10666C  
L7D-  
8GBRH(XMP)  
8GB  
(2 x  
4GB)  
-
GG34GB13  
33C9DC  
4GB  
(2 x  
GEIL  
GL1L128M  
88BA12N  
1.3V  
(low  
2GB)  
voltage)  
Hynix  
HMT351U6  
BFR8C-H9  
4GB  
2GB  
2GB  
4GB  
4GB  
4GB  
4GB  
8GB  
DS  
SS  
DS  
DS  
DS  
DS  
DS  
DS  
Hynix  
H5TQ2G83  
BFRH9C  
-
-
-
-
-
-
-
-
-
KINGMAX  
KINGSTON  
KINGSTON  
Micron  
FLFE85F-  
C8KF9 CAES  
KINGMAX  
KTC  
KFC8FMFX  
F-DXX-15A  
-
KVR1333  
D3N9/2G-SP  
D1288JEM  
FNGD9U  
1.5V  
KVR1333  
D3N9/4G  
Hynix  
H5TQ2G  
83AFR  
-
-
-
-
-
MT16JTF512  
64AZ-1G4D1  
Micron  
NANYA  
SAMSUNG  
-
OLD22D  
9LGK  
NANYA  
NT4GC64B8  
HG0NF-CG  
NT5CB256  
M8GN-CG  
SAMSUNG  
Transcend  
M378B5273  
CH0-CH9  
K4B2G0846C  
N/A  
8G DDR3  
1333 DIMM  
CL9  
1-17  
ASUS B75M-A  
1.5.3  
Installing a DIMM  
Unplug the power supply before adding or removing DIMMs or other system components.  
Failure to do so can cause severe damage to both the motherboard and the components.  
1.  
2.  
Press the retaining clips outward  
to unlock a DIMM socket.  
2
DIMM notch  
Align a DIMM on the socket  
such that the notch on the DIMM  
matches the DIMM slot key on the  
socket.  
1
1
DIMM slot key  
Unlocked retaining clip  
A DIMM is keyed with a notch so that it fits in only one direction. DO NOT force a DIMM into  
a socket in the wrong direction to avoid damaging the DIMM.  
3.  
Firmly insert the DIMM into the socket  
until the retaining clips snap back  
3
in place and the DIMM is properly  
seated.  
Locked Retaining Clip  
1.5.4  
Removing a DIMM  
To remove a DIMM:  
1.  
Simultaneously press the retaining clips  
outward to unlock the DIMM.  
Support the DIMM lightly with  
your fingers when pressing the  
2
retaining clips. The DIMM might  
get damaged when it flips out  
with extra force.  
1
1
DIMM notch  
2.  
Remove the DIMM from the socket.  
1-18  
Chapter 1: Product introduction  
1.6  
Expansion slots  
In the future, you may need to install expansion cards. The following sub-sections describe  
the slots and the expansion cards that they support.  
Unplug the power cord before adding or removing expansion cards. Failure to do so may  
cause you physical injury and damage motherboard components.  
1.6.1  
Installing an expansion card  
To install an expansion card:  
1.  
Before installing the expansion card, read the documentation that came with it and  
make the necessary hardware settings for the card.  
2.  
3.  
Remove the system unit cover (if your motherboard is already installed in a chassis).  
Remove the bracket opposite the slot that you intend to use. Keep the screw for later  
use.  
4.  
Align the card connector with the slot and press firmly until the card is completely  
seated on the slot.  
5.  
6.  
Secure the card to the chassis with the screw you removed earlier.  
Replace the system cover.  
1.6.2  
Configuring an expansion card  
After installing the expansion card, configure it by adjusting the software settings.  
1.  
Turn on the system and change the necessary BIOS settings, if any. See Chapter 2 for  
information on BIOS setup.  
2.  
3.  
Assign an IRQ to the card.  
Install the software drivers for the expansion card.  
When using PCI cards on shared slots, ensure that the drivers support “Share IRQ” or that  
the cards do not need IRQ assignments. Otherwise, conflicts will arise between the two PCI  
groups, making the system unstable and the card inoperable.  
1.6.3  
PCI slot  
The PCI slots support LAN cards, SCSI cards, USB cards, and other cards that comply with  
PCI specifications.  
1.6.4  
PCI Express 2.0 x1 slots  
This motherboard supports PCI Express x1 network cards, SCSI cards, and other cards that  
comply with the PCI Express specifications.  
1-19  
ASUS B75M-A  
1.6.5  
PCI Express 3.0/2.0 x16 slot  
This motherboard supports PCI Express x1 network cards, SCSI cards, and other cards that  
comply with the PCI Express specifications.  
IRQ assignments for this motherboard  
A
B
C
D
E
F
G
H
Intel PCH SATA controller #0  
shared  
Intel PCH SATA controller #1  
Realtek 8111F controller  
shared  
shared  
1.7  
Jumpers  
1.  
Clear RTC RAM (3-pin CLRTC)  
This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can  
clear the CMOS memory of date, time, and system setup parameters by erasing  
the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in  
CMOS, which include system setup information such as system passwords.  
B75M-A  
CLRTC  
1
2
2
3
Normal  
Clear RTC  
(Default)  
B75M-A Clear RTC RAM  
To erase the RTC RAM:  
1.  
2.  
Turn OFF the computer and unplug the power cord.  
Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3  
for about 5-10 seconds, then move the cap back to pins 1-2.  
3.  
4.  
Plug the power cord and turn ON the computer.  
Hold down the <Del> key during the boot process and enter BIOS setup to re-  
enter data.  
1-20  
Chapter 1: Product introduction  
Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default  
position. Removing the cap will cause system boot failure!  
If the steps above do not help, remove the onboard battery and move the jumper  
again to clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the  
battery.  
You do not need to clear the RTC when the system hangs due to overclocking. For  
system failure due to overclocking, use the CPU Parameter Recall (C.P.R.) feature.  
Shut down and reboot the system, then the BIOS automatically resets parameter  
settings to default values.  
2.  
P/S2 device wake-up (PS_USBPW34)  
This jumper allows you to enable or disable the P/S 2 device wake-up feature. When  
you set this jumper to pins 2-3 (+5VSB), you can wake up the computer by pressing a  
key on the P/S 2 keyboard or by clicking on the P/S 2 mouse. This feature requires an  
ATX power supply that can supply at least 1A on the +5VSB lead, and a corresponding  
setting in the BIOS.  
PS2_USBPW34  
1
2
2
3
+5VSB  
+5V  
(Default)  
B75M-A  
B75M-A Keyboard Power Setting  
1-21  
ASUS B75M-A  
3.  
USB device wake-up (USBPW12, USBPW5-8)  
Set this jumper to +5V to wake up the computer from S1 sleep mode (CPU stopped,  
DRAM refreshed, system running in low power mode) using the connected USB  
devices. Set to +5VSB to wake up from S3 and S4 sleep modes (no power to CPU,  
DRAM in slow refresh, power supply in reduced power mode).  
USBPW12  
1
2
2
3
+5VSB  
+5V  
(Default)  
USBPW5-8  
B75M-A  
1
2
2
3
+5VSB  
+5V  
(Default)  
B75M-A USB device wake up  
The USB device wake-up feature requires a power supply that can provide 500mA on  
the +5VSB lead for each USB port; otherwise, the system would not power up.  
The total current consumed must NOT exceed the power supply capability (+5VSB)  
whether under normal condition or in sleep mode.  
1-22  
Chapter 1: Product introduction  
1.8  
Connectors  
1.8.1  
Rear panel connectors  
1
2
3
4 5  
12  
11  
10  
9
8
7
6
1.  
2.  
PS/2 mouse port. This port is for a PS/2 mouse.  
Video Graphics Adapter (VGA) port. This 15-pin port is for a VGA monitor or other  
VGA-compatible devices.  
3.  
LAN (RJ-45) port. This port allows Gigabit connection to a Local Area Network (LAN)  
through a network hub.  
LAN port LED indications  
Speed  
LED  
Activity Link  
LED  
Activity/Link LED  
Speed LED  
Description Status Description  
10Mbps connection  
ORANGE 100Mbps connection  
1Gbps connection  
Status  
OFF  
No link  
Linked  
OFF  
ORANGE  
BLINKING Data activity GREEN  
LAN port  
4.  
5.  
6.  
Line In port (light blue). This port connects to the tape, CD, DVD player, or other  
audio sources.  
Line Out port (lime). This port connects to a headphone or a speaker. In the 4, 6 and  
8-channel configurations, the function of this port becomes Front Speaker Out.  
Microphone port (pink). This port connects to a microphone.  
Refer to the audio configuration table for the function of the audio ports in 2, 4, 6, or 8-  
channel configuration.  
1-23  
ASUS B75M-A  
Audio 2, 4, 6, or 8-channel configuration  
Headset  
2-channel  
Port  
4-channel  
6-channel  
8-channel  
Light Blue (Rear  
panel)  
Line In  
Rear Speaker Out  
Rear Speaker Out  
Rear Speaker Out  
Lime (Rear panel)  
Pink (Rear panel)  
Lime (Front  
panel)  
Line Out  
Mic In  
Front Speaker Out  
Mic In  
Front Speaker Out  
Bass/Center  
Front Speaker Out  
Bass/Center  
-
-
-
Side Speaker Out  
To configure an 8-channel audio output:  
Use a chassis with HD audio module in the front panel to support an 8-channel audio  
output.  
7.  
8.  
USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are for USB  
2.0/1.1 devices.  
USB 3.0 ports 1 and 2. These two 9-pin Universal Serial Bus (USB) ports are for USB  
3.0 devices.  
DO NOT connect a keyboard / mouse to any USB 3.0 port when installing Windows®  
operating system.  
Due to USB 3.0 controller limitations, USB 3.0 devices can only be used under a  
Windows® OS environment and after USB 3.0 driver installation.  
USB 3.0 devices can only be used for data storage.  
We strongly recommend that you connect USB 3.0 devices to USB 3.0 ports for faster  
and better performance from your USB 3.0 devices.  
9.  
HDMI port. This port is for a High-Definition Multimedia Interface (HDMI) connector,  
and is HDCP compliant allowing playback of HD DVD, Blu-ray, and other protected  
content.  
10. DVI-D port. This port is for any DVI-D compatible device. DVI-D can’t be converted to  
output RGB Signal to CRT and is not compatible with DVI-I.  
11. USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports are for USB  
2.0/1.1 devices.  
12. PS/2 keyboard port. This port is for a PS/2 keyboard.  
1-24  
Chapter 1: Product introduction  
1.8.2  
Internal connectors  
1.  
Front panel audio connector (10-1 pin AAFP)  
This connector is for a chassis-mounted front panel audio I/O module that supports  
either HD Audio or legacy AC`97 audio standard. Connect one end of the front panel  
audio I/O module cable to this connector.  
AAFP  
PIN 1  
PIN 1  
B75M-A  
HD-audio-compliant  
pin definition  
Legacy AC’97  
compliant definition  
B75M-A Front panel audio connector  
We recommend that you connect a high-definition front panel audio module to this  
connector to avail of the motherboard’s high-definition audio capability.  
If you want to connect a high-definition front panel audio module to this connector,  
set the Front Panel Type item in the BIOS setup to [HD]. If you want to connect an  
AC’97 front panel audio module to this connector, set the item to [AC97]. By default,  
this connector is set to [HD]. See section 2.5.7 Onboard Devices Configuration for  
details.  
1-25  
ASUS B75M-A  
2.  
ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)  
These connectors are for ATX power supply plugs. The power supply plugs are  
designed to fit these connectors in only one orientation. Find the proper orientation and  
push down firmly until the connectors completely fit.  
ATX12V  
EATXPWR  
+3 Volts  
GND  
+12 Volts  
+12 Volts  
+5V Standby  
Power OK  
GND  
+5 Volts  
+5 Volts  
+5 Volts  
-5 Volts  
GND  
PIN 1  
+5 Volts  
GND  
GND  
GND  
B75M-A  
+5 Volts  
GND  
PSON#  
GND  
+3 Volts  
+3 Volts  
-12 Volts  
+3 Volts  
PIN 1  
B75M-A ATX power connectors  
We recommend that you use an ATX 12V Specification 2.0-compliant power supply  
unit (PSU) with a minimum of 300W power rating. This PSU type has 24-pin and 4-pin  
power plugs.  
DO NOT forget to connect the 4-pin ATX +12V power plug. Otherwise, the system will  
not boot up.  
We recommend that you use a PSU with higher power output when configuring a  
system with more power-consuming devices or when you intend to install additional  
devices. The system may become unstable or may not boot up if the power is  
inadequate.  
If you are uncertain about the minimum power supply requirement for your system,  
refer to the Recommended Power Supply Wattage Calculator at http://support.asus.  
1-26  
Chapter 1: Product introduction  
3.  
CPU and chassis fan connectors (4-pin CPU_FAN, 4-pin CHA_FAN)  
Connect the fan cables to the fan connectors on the motherboard, ensuring that the  
black wire of each cable matches the ground pin of the connector.  
CPU_FAN  
CHA_FAN  
B75M-A  
B75M-A Fan connectors  
Do not forget to connect the fan cables to the fan connectors. Insufficient air flow inside  
the system may damage the motherboard components. These are not jumpers! Do not  
place jumper caps on the fan connectors! The CPU_FAN connector supports a CPU fan of  
maximum 2A (24 W) fan power.  
Only the 4-pin CPU fan supports the ASUS Fan Xpert feature.  
1-27  
ASUS B75M-A  
4.  
System panel connector (10-1 pin PANEL)  
This connector supports several chassis-mounted functions.  
F_PANEL  
PWR LED PWR BTN  
PIN 1  
B75M-A  
+HD_LED RESET  
B75M-A System panel connector  
System power LED (2-pin PLED)  
This 2-pin connector is for the system power LED. Connect the chassis power LED  
cable to this connector. The system power LED lights up when you turn on the system  
power, and blinks when the system is in sleep mode.  
Hard disk drive activity LED (2-pin IDE_LED)  
This 2-pin connector is for the HDD Activity LED. Connect the HDD Activity LED cable  
to this connector. The IDE LED lights up or flashes when data is read from or written to  
the HDD.  
ATX power button/soft-off button (2-pin PWRSW)  
This connector is for the system power button.  
Reset button (2-pin RESET)  
This 2-pin connector is for the chassis-mounted reset button for system reboot without  
turning off the system power.  
1-28  
Chapter 1: Product introduction  
5.  
Speaker connector (4-pin SPEAKER)  
The 4-pin connector is for the chassis-mounted system warning speaker. The speaker  
allows you hear system beeps and warnings.  
SPEAKER  
B75M-A  
PIN 1  
B75M-A Speaker Out Connector  
6.  
Intel® B75 Serial ATA 3.0Gb/s connectors (7-pin SATA3G_1~5 [blue])  
These connectors connect to Serial ATA 3.0 Gb/s hard disk drives and optical drives via  
Serial ATA 3.0 Gb/s signal cables.  
SATA3G_1  
SATA3G_2  
GND  
RSATA_TXP2  
GND  
RSATA_RXP1  
RSATA_TXN2  
GND  
RSATA_RXN2  
RSATA_RXP2  
GND  
RSATA_RXN1  
GND  
RSATA_TXN1  
RSATA_TXP1  
GND  
SATA3G_3  
SATA3G_4  
GND  
RSATA_TXP4  
RSATA_TXN4  
GND  
RSATA_RXN4  
RSATA_RXP4  
GND  
GND  
RSATA_RXP3  
RSATA_RXN3  
GND  
RSATA_TXN3  
RSATA_TXP3  
GND  
SATA3G_5  
B75M-A  
GND  
RSATA_RXP5  
RSATA_RXN5  
GND  
RSATA_TXN5  
RSATA_TXP5  
GND  
B75M-A SATA 3.0Gb/s connectors  
You must install Windows. XP® Service Pack 3 or later version before using Serial ATA  
hard disk drives.  
• When using hot-plug and NCQ, set the SATA Mode Selection item in the BIOS to [AHCI].  
See section 2.5.3 SATA Configuration for details.  
1-29  
ASUS B75M-A  
7.  
Intel® B75 Serial ATA 6.0Gb/s connector (7-pin SATA6G_1 [gray])  
This connector connects to Serial ATA 6.0 Gb/s hard disk drives via Serial ATA 6.0 Gb/s  
signal cables.  
SATA6G_1  
B75M-A  
GND  
RSATA_TXP1  
RSATA_TXN1  
GND  
RSATA_RXN1  
RSATA_RXP1  
GND  
B75M-A SATA 6.0Gb/s connector  
You must install Windows. XP Service Pack 3 or later version before using Serial ATA  
hard disk drives.  
• When using hot-plug and NCQ, set the SATA Mode Selection item in the BIOS to [AHCI].  
See section 2.5.3 SATA Configuration for details.  
8.  
USB 3.0 connector (20-1 pin USB3_34)  
This connector is for additional USB 3.0 ports. Connect the USB 3.0 bracket cable to  
this connector, then install the USB 3.0 bracket to the rear side of the chassis. If your  
chassis supports front panel ports, you can use the ASUS USB 3.0 header to install  
additional front panel USB 3.0 ports.  
USB3_34  
PIN  
1
B75M-A  
B75M-A USB3.0 Front panel connector  
The USB 3.0 module is purchased separately.  
1-30  
Chapter 1: Product introduction  
9.  
USB 2.0 connectors (10-1 pin USB56, USB78)  
These connectors are for USB 2.0 ports. Connect the USB module cable to any of  
these connectors, then install the module to a slot opening at the back of the system  
chassis. These USB connectors comply with USB 2.0 specifications and supports up to  
480Mbps connection speed.  
USB56  
USB78  
B75M-A  
PIN 1  
PIN 1  
B75M-A USB2.0 connectors  
Never connect a 1394 cable to the USB connectors. Doing so will damage the  
motherboard!  
The USB 2.0 module is purchased separately.  
1-31  
ASUS B75M-A  
1.9  
Onboard LEDs  
1.  
Standby Power LED  
The motherboard comes with a standby power LED that lights up to indicate that the  
system is ON, in sleep mode, or in soft-off mode. This is a reminder that you should  
shut down the system and unplug the power cable before removing or plugging in any  
motherboard component. The illustration below shows the location of the onboard LED.  
SB_PWR  
B75M-A  
ON  
OFF  
Standby Power Powered Off  
B75M-A Onboard LED  
1.10  
Software support  
1.10.1  
Installing an operating system  
This motherboard supports Windows® XP and Windows 7® Operating Systems (OS). Always  
install the latest OS version and corresponding updates to maximize the features of your  
hardware.  
Motherboard settings and hardware options vary. Refer to your OS documentation for  
detailed information.  
Ensure that you install Windows® XP Service Pack 3 or later versions / Windows®  
Vista Service Pack 1 or later versions before installing the drivers for better  
compatibility and system stability.  
1.10.2  
Support DVD information  
The Support DVD that comes with the motherboard package contains the drivers, software  
applications, and utilities that you can install to avail all motherboard features.  
The contents of the Support DVD are subject to change at any time without notice. Visit the  
1-32  
Chapter 1: Product introduction  
To run the Support DVD  
Place the Support DVD into the optical drive. If Autorun is enabled in your computer, the  
DVD automatically displays the Specials screen which lists the unique features of your ASUS  
motherboard. Click Drivers, Utilities, Make Disk, Manual, and Contact tabs to display their  
respective menus.  
The following screen is for reference only.  
Click an icon to  
display Support  
DVD/motherboard  
information  
Click an item to install  
If Autorun is NOT enabled in your computer, browse the contents of the Support DVD to  
locate the file ASSETUP.EXE from the BIN folder. Double-click the ASSETUP.EXE to run  
the DVD.  
1-33  
ASUS B75M-A  
1.10.3  
Intel® SBA support  
Intel® SBA (Small Business Advantage) is a combination of hardware and software that  
provides unique security and productivity capabilities designed for small businesses.  
Intel® SBA requires MEI driver (AMT host software kit) installed.  
Platform requirements:  
Windows® 7 (32/64bit)  
Panther Point PCH with Core™ Ivy Bridge CPU or Sandy Bridge CPU (Chief River/  
Maho Bay platforms) with 5MB vPro ME 8.0 firmware load  
CPU and chipsets requirements:  
* Intel® Core™ i3 with B75  
* Intel® Core™ i5 with B75  
* Intel® Core™ i7 with B75  
* Intel® Core™ i5 vPro with one of these chipsets: B75, Q77  
* Intel® Core™ i7 vPro with one of these chipsets: B75, Q77  
The Intel® Management Engine software kit must be installed (The Local Manageability  
Service and the Intel® Management Engine Interface must be installed and running.)  
Local Administrator rights on the target machine  
The Intel® SBA does not support the 800 x 600 screen resolution.  
Visit the ASUS website at www.asus.com for the latest CPU QVL (Qualified Vendors List).  
1-34  
Chapter 1: Product introduction  
BIOS information  
2
2.1  
Managing and updating your BIOS  
Save a copy of the original motherboard BIOS file to a USB flash disk in case you need to  
restore the BIOS in the future. Copy the original motherboard BIOS using the ASUS Update  
utility.  
2.1.1  
ASUS Update utility  
The ASUS Update is a utility that allows you to manage, save, and update the motherboard  
BIOS in Windows® environment.  
ASUS Update requires an Internet connection either through a network or an Internet  
Service Provider (ISP).  
This utility is available in the support DVD that comes with the motherboard package.  
Installing ASUS Update  
To install ASUS Update:  
1.  
2.  
3.  
Place the support DVD in the optical drive. The Drivers menu appears.  
Click the Utilities tab, then click AI Suite II.  
Follow the onscreen instructions to complete the installation.  
Quit all Windows® applications before you update the BIOS using this utility.  
Updating the BIOS  
To update the BIOS:  
1.  
From the Windows® desktop, click Start > Programs > ASUS > AI Suite II > AI Suite  
II X.XX.XX to launch the AI Suite II utility. The AI Suite II Quick Bar appears.  
2.  
Click Update button from the Quick Bar, and then click ASUS Update from the popup  
menu. The ASUS Update main screen appears. From the list, select either of the  
following methods:  
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ASUS B75M-A  
Updating from the Internet  
a. Select Update BIOS from the Internet, then click Next.  
b. Select the ASUS FTP site nearest you to avoid network traffic, then click Next.  
c. From the FTP site, select the BIOS version that you wish to download then click  
Next.  
The ASUS Update utility is capable of updating itself through the Internet. Always update  
the utility to avail all its features.  
Updating from a BIOS file  
a. Select Update BIOS from file, then click Next.  
b. Locate the BIOS file from the Open window, then click Open.  
Follow the onscreen instructions to complete the updating process.  
3.  
2.1.2  
ASUS EZ Flash 2  
The ASUS EZ Flash 2 feature allows you to update the BIOS without using an OS-based  
utility.  
Before you start using this utility, download the latest BIOS file from the ASUS website at  
To update the BIOS using EZ Flash 2:  
1.  
Insert the USB flash disk that contains the latest BIOS file to the USB port.  
2.  
Enter the Advanced Mode of the BIOS setup program. Go to the Tool menu to select  
ASUS EZ Flash Utility and press <Enter> to enable it.  
3.  
Press <Tab> to switch to the Drive field.  
4.  
Press the Up/Down arrow keys to find the USB flash disk that contains the latest BIOS,  
and then press <Enter>.  
5.  
Press <Tab> to switch to the Folder Info field.  
6.  
Press the Up/Down arrow keys to find the BIOS file, and then press <Enter> to perform  
the BIOS update process. Reboot the system when the update process is done.  
This function supports USB flash disks formatted using FAT32/16 on a single partition  
only.  
DO NOT shut down or reset the system while updating the BIOS to prevent system  
boot failure!  
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Chapter 2: Getting started  
2.1.3  
ASUS CrashFree BIOS 3 utility  
The ASUS CrashFree BIOS 3 is an auto recovery tool that allows you to restore the BIOS file  
when it fails or gets corrupted during the updating process. You can restore a corrupted BIOS  
file using the motherboard support DVD or a USB flash drive that contains the updated BIOS  
file.  
Before using this utility, rename the BIOS file in the removable device into  
B75MA.CAP.  
The BIOS file in the support DVD may not be the latest version. Download the latest  
BIOS file from the ASUS website at www.asus.com.  
Recovering the BIOS  
To recover the BIOS:  
1.  
Turn on the system.  
2.  
Insert the support DVD to the optical drive or the USB flash drive that contains the  
BIOS file to the USB port.  
3.  
The utility automatically checks the devices for the BIOS file. When found, the utility  
reads the BIOS file and enters ASUS EZ Flash 2 utility automatically.  
4.  
The system requires you to enter BIOS Setup to recover BIOS settings. To ensure  
system compatibility and stability, we recommend that you press <F5> to load default  
BIOS values.  
DO NOT shut down or reset the system while updating the BIOS! Doing so can cause  
system boot failure!  
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ASUS B75M-A  
2.1.4  
ASUS BIOS Updater  
The ASUS BIOS Updater allows you to update BIOS in a DOS environment. This utility also  
allows you to copy the current BIOS file that you can use as a backup when the BIOS fails or  
gets corrupted during the updating process.  
The succeeding utility screens are for reference only. The actual utility screen displays may  
not be same as shown.  
Before updating BIOS  
1.  
Prepare the motherboard support DVD and a USB flash drive formatted using  
FAT32/16 on a single partition.  
2.  
Download the latest BIOS file and BIOS Updater from the ASUS website at  
http://support.asus.com and save them on the USB flash drive.  
NTFS is not supported under DOS environment. Do not save the BIOS file and BIOS  
Updater to a hard disk drive or USB flash drive in NTFS format.  
3.  
Turn off the computer and disconnect all SATA hard disk drives (optional).  
Booting the system to a DOS environment  
1.  
Insert the USB flash drive with the latest BIOS file and BIOS Updater to the USB port.  
2.  
Boot your computer. When the ASUS Logo appears, press <F8> to show the BIOS  
Boot Device Select Menu. Insert the support DVD into the optical drive and select the  
optical drive as the boot device.  
3.  
4.  
When the Make Disk menu appears, select the FreeDOS command prompt item by  
pressing the item number.  
At the FreeDOS prompt, type d: and press <Enter> to switch the disk from Drive C  
(optical drive) to Drive D (USB flash drive).  
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Chapter 2: Getting started  
Updating the BIOS file  
To update the BIOS file using BIOS Updater:  
1.  
At the FreeDOS prompt, type bupdater /pc /g and press <Enter>.  
2.  
The BIOS Updater screen appears as below.  
B75M-A  
0212  
02/17/2013  
B75MA.CAP 8194 2013-02-17 15:25:48  
3.  
Press <Tab> to switch between screen fields and use the <Up/Down/Home/End> keys  
to select the BIOS file and press <Enter>. BIOS Updater checks the selected BIOS file  
and prompts you to confirm BIOS update.  
4.  
Select Yes and press <Enter>. When BIOS update is done, press <ESC> to exit BIOS  
Updater. Restart your computer.  
DO NOT shut down or reset the system while updating the BIOS to prevent system boot  
failure!  
For BIOS Updater version 1.04 or later, the utility automatically exits to the DOS  
prompt after updating BIOS.  
Ensure to load the BIOS default settings to ensure system compatibility and stability.  
Select the Load Optimized Defaults item under the Exit menu. Refer to section 2.9  
Exit menu for details.  
Ensure to connect all SATA hard disk drives after updating the BIOS file if you have  
disconnected them.  
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ASUS B75M-A  
2.2  
BIOS setup program  
Use the BIOS Setup program to update the BIOS or configure its parameters. The BIOS  
screens include navigation keys and brief online help to guide you in using the BIOS Setup  
program.  
Entering BIOS Setup at startup  
To enter BIOS Setup at startup:  
Press <Delete> during the Power-On Self Test (POST). If you do not press <Delete>,  
POST continues with its routines.  
Entering BIOS Setup after POST  
To enter BIOS Setup after POST:  
Press <Ctrl>+<Alt>+<Del> simultaneously.  
Press the reset button on the system chassis.  
Press the power button to turn the system off then back on. Do this option only if you  
failed to enter BIOS Setup using the first two options.  
Using the power button, reset button, or the <Ctrl>+<Alt>+<Del> keys to force reset from a  
running operating system can cause damage to your data or system. We recommend you  
always shut down the system properly from the operating system.  
The BIOS setup screens shown in this section are for reference purposes only, and  
may not exactly match what you see on your screen.  
Visit the ASUS website at www.asus.com to download the latest BIOS file for this  
motherboard.  
Ensure that a USB mouse is connected to your motherboard if you want to use the  
mouse to control the BIOS setup program.  
If the system becomes unstable after changing any BIOS setting, load the default  
settings to ensure system compatibility and stability. Select the Load Optimized  
Defaults item under the Exit menu. See section 2.9 Exit Menu for details.  
If the system fails to boot after changing any BIOS setting, try to clear the CMOS and  
reset the motherboard to the default value. See section 1.7 Jumpers for information  
on how to erase the RTC RAM.  
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Chapter 2: Getting started  
BIOS menu screen  
The BIOS setup program can be used under two modes: EZ Mode and Advanced Mode.  
You can change modes from the Exit menu or from the Exit/Advanced Mode button in the EZ  
Mode/Advanced Mode screen.  
EZ Mode  
By default, the EZ Mode screen appears when you enter the BIOS setup program. The EZ  
Mode provides you an overview of the basic system information, and allows you to select  
the display language, system performance mode and boot device priority. To access the  
Advanced Mode, click Exit/Advanced Mode, then select Advanced Mode.  
The default screen for entering the BIOS setup program can be changed. Refer to the  
Setup Mode item in section 2.7 Boot menu for details.  
Displays the CPU/motherboard  
temperature, CPU voltage output,  
and CPU/chassis fan speed  
Selects the display language  
of the BIOS setup program  
Exits the BIOS setup program without  
saving the changes, saves the changes  
and resets the system, or enters the  
Advanced Mode  
Selects the boot  
device priority  
Displays the system  
Power  
Saving  
mode  
Loads  
optimized  
default  
Normal  
mode  
properties of the  
selected mode on the  
right hand side  
Selects the boot  
device priority  
ASUS Optimal  
mode  
Selects the  
Advanced mode  
functions  
The boot device options vary depending on the devices you installed to the system.  
The Boot Menu(F8) button is available only when the boot device is installed to the  
system.  
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ASUS B75M-A  
Advanced Mode  
The Advanced Mode provides advanced options for experienced end-users to configure the  
BIOS settings. The figure below shows an example of the Advanced Mode. Refer to the  
following sections for the detailed configurations.  
To access the EZ Mode, click Exit, then select ASUS EZ Mode.  
Back button  
Menu items  
Menu bar  
Configuration fields  
General help  
Pop-up window  
Submenu item  
Navigation keys  
Menu bar  
The menu bar on top of the screen has the following main items:  
Main  
For changing the basic system configuration  
For changing the overclocking settings  
For changing the advanced system settings  
Ai Tweaker  
Advanced  
For displaying the system temperature, power status, and changing the  
fan settings  
Monitor  
Boot  
Tool  
Exit  
For changing the system boot configuration  
For configuring options for special functions  
For selecting the exit options and loading default settings  
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Chapter 2: Getting started  
Menu items  
The highlighted item on the menu bar displays the specific items for that menu. For example,  
selecting Main shows the Main menu items.  
The other items (Ai Tweaker, Advanced, Monitor, Boot, Tool, and Exit) on the menu bar have  
their respective menu items.  
Back button  
This button appears when entering a submenu. Press <Esc> or use the USB mouse to click  
this button to return to the previous menu screen.  
Submenu items  
A greater than sign (>) before each item on any menu screen means that the item has a  
submenu. To display the submenu, select the item and press <Enter>.  
Pop-up window  
Select a menu item and press <Enter> to display a pop-up window with the configuration  
options for that item.  
Scroll bar  
A scroll bar appears on the right side of a menu screen when there are items that do not fit on  
the screen. Press the Up/Down arrow keys or <Page Up> / <Page Down> keys to display the  
other items on the screen.  
Navigation keys  
At the bottom right corner of the menu screen are the navigation keys for the BIOS setup  
program. Use the navigation keys to select items in the menu and change the settings.  
General help  
At the top right corner of the menu screen is a brief description of the selected item.  
Configuration fields  
These fields show the values for the menu items. If an item is user-configurable, you can  
change the value of the field opposite the item. You cannot select an item that is not  
user-configurable.  
A configurable field is highlighted when selected. To change the value of a field, select it and  
press <Enter> to display a list of options.  
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ASUS B75M-A  
2.3  
Main menu  
The Main menu screen appears when you enter the Advanced Mode of the BIOS Setup  
program. The Main menu provides you an overview of the basic system information, and  
allows you to set the system date, time, language, and security settings.  
2.3.1  
System Language [English]  
Allows you to choose the BIOS language version from the options.  
Configuration options: [English] [Francais] [Español] [Deutsch] [Русский] [日本語 ] [繁體中文]  
[簡体中文]  
2.3.2  
System Date [Day xx/xx/xxxx]  
Allows you to set the system date.  
2.3.3  
System Time [xx:xx:xx]  
Allows you to set the system time.  
2.3.4  
Security  
The Security menu items allow you to change the system security settings.  
If you have forgotten your BIOS password, erase the CMOS Real Time Clock (RTC)  
RAM to clear the BIOS password. See section 1.7 Jumpers for information on how to  
erase the RTC RAM.  
The Administrator or User Password items on top of the screen show the default  
Not Installed. After you set a password, these items show Installed.  
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Chapter 2: Getting started  
Administrator Password  
If you have set an administrator password, we recommend that you enter the administrator  
password for accessing the system. Otherwise, you might be able to see or change only  
selected fields in the BIOS setup program.  
To set an administrator password:  
1.  
2.  
3.  
Select the Administrator Password item and press <Enter>.  
From the Create New Password box, key in a password, then press <Enter>.  
Confirm the password when prompted.  
To change an administrator password:  
1.  
2.  
Select the Administrator Password item and press <Enter>.  
From the Enter Current Password box, key in the current password, then press  
<Enter>.  
3.  
From the Create New Password box, key in a new password, then press <Enter>.  
4.  
Confirm the password when prompted.  
To clear the administrator password, follow the same steps as in changing an administrator  
password, but press <Enter> when prompted to create/confirm the password. After you clear  
the password, the Administrator Password item on top of the screen shows Not Installed.  
User Password  
If you have set a user password, you must enter the user password for accessing the system.  
The User Password item on top of the screen shows the default Not Installed. After you set  
a password, this item shows Installed.  
To set a user password:  
1.  
2.  
3.  
Select the User Password item and press <Enter>.  
From the Create New Password box, key in a password, then press <Enter>.  
Confirm the password when prompted.  
To change a user password:  
1.  
2.  
Select the User Password item and press <Enter>.  
From the Enter Current Password box, key in the current password, then press  
<Enter>.  
3.  
From the Create New Password box, key in a new password, then press <Enter>.  
4.  
Confirm the password when prompted.  
To clear the user password, follow the same steps as in changing a user password, but press  
<Enter> when prompted to create/confirm the password. After you clear the password, the  
User Password item on top of the screen shows Not Installed.  
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ASUS B75M-A  
2.4  
Ai Tweaker menu  
The Ai Tweaker menu items allow you to configure overclocking-related items.  
Be cautious when changing the settings of the Ai Tweaker menu items. Incorrect field  
values can cause the system to malfunction.  
The configuration options for this section vary depending on the CPU and DIMM model you  
installed on the motherboard.  
Target DRAM Speed : xxxxMHz  
Displays the current DRAM speed.  
2.4.1  
Memory Frequency [Auto]  
Allows you to set the memory operating frequency. Configuration options: [Auto] [DDR3-  
800MHz][DDR3-1066MHz][DDR3-1333MHz][DDR3-1600MHz][DDR3-1866MHz][DDR-  
2133MHz][DDR-2400MHz]  
Selecting a very high memory frequency may cause the system to become unstable! If this  
happens, revert to the default setting.  
2.4.2  
EPU Power Saving Mode [Disabled]  
Allows you to enable or disable the EPU power saving function. Configuration options:  
[Disabled] [Enabled]  
EPU Setting [Auto]  
This item appears only when you set the EPU Power Saving MODE item to [Enabled.] and  
allows you to select the EPU power saving mode. Configuration options: [Auto] [Light Power  
Saving Mode] [Medium Power Saving Mode] [Max Power Saving Mode]  
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Chapter 2: Getting started  
2.4.3  
DRAM Timing Control  
The subitems in this menu allow you to set the DRAM timing control features. Use the <+>  
and <-> keys to adjust the value. To restore the default setting, type [auto] using the keyboard  
and press the <Enter> key.  
Changing the values in this menu may cause the system to become unstable! If this  
happens, revert to the default settings.  
Primary Timings  
DRAM CAS# Latency [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]  
DRAM RAS# to CAS# Delay [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]  
DRAM RAS# PRE Time [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]  
DRAM RAS# ACT Time [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [255 DRAM Clock]  
DRAM COMMAND Mode [Auto]  
Configuration options: [Auto] [1 DRAM Clock] [2 DRAM Clock] [3 DRAM Clock]  
Secondary Timings  
DRAM RAS# to RAS# Delay [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]  
DRAM REF Cycle Time [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [511 DRAM Clock]  
DRAM Refresh Interval [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [65535 DRAM Clock]  
DRAM WRITE Recovery Time [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [31 DRAM Clock]  
DRAM READ to PRE Time [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]  
DRAM FOUR ACT WIN Time [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [63 DRAM Clock]  
DRAM WRITE to READ Delay [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]  
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ASUS B75M-A  
DRAM CKE Minimum pulse width [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]  
DRAM CAS# Write to Latency [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]  
DRAM RTL (CHA) [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [63 DRAM Clock]  
DRAM RTL (CHB) [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [63 DRAM Clock]  
DRAM I0-L (CHA) [Auto]  
Configuration options: [Auto] [Delay 1 Clock] - [Delay 15 Clock]  
DRAM IO-L (CHB) [Auto]  
Configuration options: [Auto] [Delay 1 Clock] - [Delay 15 Clock]  
Third Timings  
tWRDR (DD) [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [8 DRAM Clock]  
tRWDR (DD) [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [8 DRAM Clock]  
tRWSR [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [8 DRAM Clock]  
tRR (DD) [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [8 DRAM Clock]  
tRR (DR) [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [8 DRAM Clock]  
tRRSR [Auto]  
Configuration options: [Auto] [4 DRAM Clock] – [7 DRAM Clock]  
tWW (DD) [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [8 DRAM Clock]  
tWW (DR) [Auto]  
Configuration options: [Auto] [1 DRAM Clock] – [8 DRAM Clock]  
tWWSR [Auto]  
Configuration options: [Auto] [4 DRAM Clock] – [7 DRAM Clock]  
MISC  
MRC Fast Boot [Enabled]  
Allows you to enable or disable the MRC fast boot.  
[Enabled]  
Enables the MRC fast boot.  
[Disable]  
Disables the MRC fast boot.  
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Chapter 2: Getting started  
DRAM CLK Period [Auto]  
Configuration options: [Auto] [2] [3] [4]  
Transmitter Slew (CHA) [Auto]  
Configuration options: [Auto] [1] – [7]  
Transmitter Slew (CHB) [Auto]  
Configuration options: [Auto] [1] – [7]  
Receiver Slew (CHA) [Auto]  
Configuration options: [Auto] [1] – [7]  
Receiver Slew (CHB) [Auto]  
Configuration options: [Auto] [1] – [7]  
MCH Duty Sense (CHA) [Auto]  
Configuration options: [Auto] [1] – [31]  
MCH Duty Sense (CHB) [Auto]  
Configuration options: [Auto] [1] – [31]  
Channel A DIMM Control [Enable Bot...]  
Configuration options: [Enable Both DIMMS] [Disable DIMM0] [Disable DIMM1]  
[Disable Both DIMMS]  
Channel B DIMM Control [Enable Bot...]  
Configuration options: [Enable Both DIMMS] [Disable DIMM0] [Disable DIMM1]  
[Disable Both DIMMS]  
DRAM Read Additional Swizzle [Auto]  
Configuration options: [Auto] [Enabled] [Disabled]  
DRAM Write Additional Swizzle [Auto]  
Configuration options: [Auto] [Enabled] [Disabled]  
2.4.4  
CPU Power Management  
The subitems in this menu allow you to set the CPU ratio and features.  
CPU Ratio [Auto]  
Allows you to manually adjust the maximum non-turbo CPU ratio. Use <+> and <-> keys to  
adjust the value. The valid value ranges vary according to your CPU model.  
Enhanced Intel® SpeedStep Technology [Enabled]  
Allows you to enable or disable the Enhanced Intel® SpeedStep Technology (EIST).  
[Disabled]  
[Enabled]  
Disables this function.  
The operating system dynamically adjusts the processor voltage and  
core frequency which may result in decreased average consumption and  
decreased average heat production.  
Turbo Mode [Enabled]  
Allows you to enable your core processor’s speed to run faster than the marked frequency in  
a specific condition. Configuration options: [Disabled] [Enabled]  
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ASUS B75M-A  
Turbo Mode is only available on selected CPU models only.  
The following items appear only when you set the Turbo Mode to [Enabled].  
Turbo Mode Parameters  
Long Duration Power Limit [Auto]  
Allows you to limit the turbo ratio’s long duration power.  
Use the <+> and <-> keys to adjust the value.  
Long Duration Maintained [Auto]  
Allows you to maintain the turbo ratio’s long duration power.  
Use the <+> and <-> keys to adjust the value.  
Short Duration Power Limit [Auto]  
Allows you to limit the turbo ratio’s long duration power.  
Use the <+> and <-> keys to adjust the value.  
Primary Plane Current Limit [Auto]  
Maximum instantaneous current allowed at any given time for CPU cores  
Use <+> and <-> key to adjust the value at 0.125A increment.  
Secondary Plane Current Limit [Auto]  
Maximum instantaneous current allowed at any given time for Internal  
Graphics cores. Use <+> and <-> key to adjust the value at 0.125A  
increment.  
2.4.5  
DIGI+ VRM  
CPU Load-Line Calibration [Auto]  
Load-line is defined by Intel VRM spec and affects CPU voltage. The CPU working voltage  
will decrease proportionally to CPU loading. Higher value gets a higher voltage and better  
overclocking performance, but increases the CPU and VRM thermal. This item allows you to  
adjust the voltage range from the following percentages to boost the system performance:  
0% (Regular), 25% (Medium), 50% (High), 75% (Ultra High) and 100% (Extreme).  
Configuration options: [Auto] [Regular] [Medium] [High] [Ultra High] [Extreme]  
The actual performance boost may vary depending on your CPU specification.  
CPU Fixed Frequency [xxx]  
Switching frequency will affect the VRM transient response and component thermal. Setting  
a higher frequency gets faster transient response.The values range from 200K to 350K with a  
50K interval. Use <+>/<-> to adjust the value.  
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Chapter 2: Getting started  
CPU Power Phase Control [Standard]  
Allows you to control the power phase based on the CPU’s demands.  
Configuration options: [Standard] [Optimized] [Extreme] [Manual Adjustment]  
DO NOT remove the thermal module when switching to Extreme and Manual Mode. The  
thermal conditions should be monitored.  
CPU Power Duty Control [T.Probe]  
DIGI + VRM Duty control adjusts the current and thermal conditions of every component’s  
phase.  
[T. Probe]  
[Extreme]  
Select to maintain the VRM thermal balance.  
Select to maintain the current VRM balance.  
CPU Current Capability [100%]  
Allows you to configure the total power range, and extends the overclocking frequency range  
simultaneously. Configuration options: [100%] [110%] [120%]  
Choose a higher value when overclocking, or under a high CPU loading for extra power  
support.  
iGPU Load-line Calibration [Auto]  
Load-line Calibration is defined by Intel VRM specifications and affects iGPU voltage. The  
iGPU working voltage will decrease proportionally to the integrated graphics loading. Higher  
load-line calibration would get higher voltage and better overclocking performance, but  
increase the CPU and VRM thermal. This item allows you to adjust the voltage range from  
the following percentages to boost the system performance: 0% (Regular), 50% (High) and  
100% (Extreme). Configuration options: [Auto] [Regular] [High] [Extreme]  
iGPU Current Capability [100%]  
Allows you to set the iGPU Current Capability. Configuration options: [100%] [110%] [120%]  
Do not remove the thermal module while changing the DIGI+ VRM related parrameters .  
The thermal conditions should be monitored.  
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ASUS B75M-A  
2.5  
Advanced menu  
The Advanced menu items allow you to change the settings for the CPU and other system  
devices.  
Be cautious when changing the settings of the Advanced menu items. Incorrect field values  
can cause the system to malfunction.  
2.5.1  
CPU Configuration  
The items in this menu show the CPU-related information that the BIOS automatically  
detects.  
The items shown in submenu may be different due to the CPU you installed.  
Intel® Adaptive Thermal Monitor [Enabled]  
[Enabled]  
[Disabled]  
Enables the overheated CPU to throttle its clock speed to cool down.  
Disables the CPU thermal monitor function.  
Active Processor Cores [All]  
Allows you to choose the number of CPU cores to activate in each processor package.  
Configuration options: [All] [1] [2] [3]  
Limit CPUID Maximum [Disabled]  
[Enabled]  
Allows legacy operating systems to boot even without support for CPUs  
with extended CPUID functions.  
[Disabled]  
Disables this function.  
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Chapter 2: Getting started  
Execute Disable Bit [Enabled]  
[Enabled]  
Enables the No-Execution Page Protection Technology.  
Forces the XD feature flag to always return to zero (0).  
[Disabled]  
Intel® Virtualization Technology [Disabled]  
[Enabled]  
[Disabled]  
Allows a hardware platform to run multiple operating systems separately  
and simultaneously, enabling one system to virtually function as several  
systems.  
Disables this function.  
Hardware Prefetcher [Enabled]  
[Enabled]  
Allows a hardware platform to automatically analyze the requirements and  
prefetch data and codes for the CPU.  
[Disabled]  
Disables this function.  
Adjacent Cache Line Prefetch [Enabled]  
[Enabled]  
[Disabled]  
Allows a hardware platform to perform adjacent cache line prefetching.  
Disables this function.  
CPU Power Management Configuration  
This item allows you to manage and configure the CPU’s power.  
CPU Ratio [Auto]  
Allows you to set the ratio between the CPU Core Clock and the BCLK Frequency. Use  
<+> and <-> keys to adjust the ratio. The valid value ranges vary according to your  
CPU model.  
Enhanced Intel® SpeedStep Technology [Enabled]  
Allows you to enable or disable the Enhanced Intel® SpeedStep Technology (EIST).  
[Disabled]  
[Enabled}  
The CPU runs at its default speed.  
The operating system controls the CPU speed.  
Turbo Mode [Enabled]  
Allows you to set the processor cores to run faster than the marked frequency in a  
specific condition. Configuration options: [Enabled] [Disabled]  
Turbo Mode is only available on selected CPU models only.  
CPU C1E [Auto]  
[Auto]  
Automatically enables the C1E support function.  
[Enabled]  
Enables the C1E support function. This function must be enabled to  
enable or disable the Intel® Turbo Mode Technology.  
[Disabled]  
Disables the function.  
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ASUS B75M-A  
CPU C3 Report [Auto]  
Allows you to disable or enable the CPU C3 report to OS. Configuration options: [Auto]  
[Disabled] [Enabled]  
CPU C6 Report [Auto]  
Allows you to disable or enable the CPU C6(ACPI C3) report to OS. Configuration  
options: [Auto] [Disabled] [Enabled]  
Package C State Support [Auto]  
Allows you to disable or enable the Package C State support. Configuration options:  
[Auto] [Disabled] [Enabled]  
2.5.2  
PCH Configuration  
High Precision Timer [Enabled]  
Allows you to enable or disable the High Precision Event Timer.  
Configuration options: [Enabled] [Disabled]  
Intel® Rapid Start Technology  
Allows you to enable or disable Intel® Rapid Start Technology.  
Configuration options: [Enabled] [Disabled]  
Intel® Rapid Start Technology [Disabled]  
Allow you to enable or disable Intel® Rapid Start Technology.  
Configuration options: [Enabled] [Disabled]  
The following items appear only when you set the Intel® Rapid Start Technology to  
[Enabled].  
Entry on S3 RTC Wake [Enabled]  
The system automatically wakes up and set to Rapid Start Technology S4 mode.  
Configuration options: [Enabled] [Disabled  
Entry After [Immediately]  
Allows you to set the wake-up time.  
Configuration options: [Immediately] [1 minute] [2 minutes] [5 minutes] [10 minutes]  
[15 minutes] [30 minutes] [1 hour] [2 hours]  
Active Page Threshold Support [Enabled]  
The system automatically set itself to sleep when the partition size is not enough for  
Rapid Start Technology to work. Configuration options: [Enabled] [Disabled]  
Active Memory Threshold [0]  
Key in the value for the additional partition size for Rapid Start Technology to work.  
Ensure that the caching partition size is larger than the total memory size.  
2-20  
Chapter 2: Getting started  
Intel® Smart Connect Technology [Disabled]  
ICST Configuration [Disabled]  
Allows you to enable or disable the ISCT configuration. Configuration options:  
[Enabled] [Disabled]  
2.5.3  
SATA Configuration  
While entering Setup, the BIOS automatically detects the presence of SATA devices. The  
SATA Port items show Not Present if no SATA device is installed to the corresponding SATA  
port.  
SATA Mode Selection [AHCI]  
Allows you to set the SATA configuration.  
[Disabled]  
[IDE]  
Disables the SATA function.  
Set to [IDE] when you want to use the Serial ATA hard disk drives as  
Parallel ATA physical storage devices.  
[AHCI]  
Set to [AHCI] when you want the SATA hard disk drives to use the AHCI  
(Advanced Host Controller Interface). The AHCI allows the onboard storage  
driver to enable advanced Serial ATA features that increases storage  
performance on random workloads by allowing the drive to internally  
optimize the order of commands.  
S.M.A.R.T. Status Check [Enabled]  
S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) is a monitor system. When  
read/write of your hard disk errors occur, this feature allows the hard disk to report warning  
messages during the POST. Configuration options: [Enabled] [Disabled]  
Hot Plug [Disabled]  
These items appear only when you set the SATA Mode Selection item to [AHCI] and allow  
you to enable/disable SATA Hot Plug Support.  
Configuration options: [Disabled] [Enabled]  
2.5.4  
System Agent Configuration  
Memory Remap Feature [Enabled]  
Allows you to enable remapping the memory above 4GB.  
[Enabled]  
[Disabled]  
Enables the function.  
Disables this function.  
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ASUS B75M-A  
Graphics Configuration  
Allows you to select a primary display from iGPU, and PCIe graphical devices.  
Primary Display [Auto]  
Allows you to select which of the iGPU/PCIE Graphics device should be the Primary  
Display. Configuration options: [Auto] [iGPU] [PCIE] [PCI]  
iGPU Memory [Auto]  
Allows you to select the amount of system memory allocated to DVMT 5.0 used by the  
iGPU. Configuration options: [Auto] [32M]~[1024M]  
Render Standby [Enabled]  
Allows you to enable the Intel® Graphics Render Standby support to reduce the iGPU  
power use when idle. Configuration options: [Disabled] [Enabled]  
iGPU Multi-Monitor [Disabled]  
Allows you to enable the iGPU Multi-Monitor. For Lucid Virtu MVP function supports,  
set this item to [Enabled] to empower both integrated and discrete graphics. iGPU  
shared system memory size is fixed in 64MB.  
Configuration options: [Disabled] [Enabled]  
NB PCIe Configuration  
Allows you to configure the NB PCI Express settings.  
PCIEx16 Link Speed [Auto]  
Allows you to configure the PCIEx16 speed.  
Configuration options: [Auto] [Gen1] [Gen2] [Gen3]  
2.5.5  
AMT Configuration  
The items in this menu allow you to change the Intel® Active Management Technology (AMT)  
feature.  
Intel® AMT [Enabled]  
Allow you to enable or disable the Intel® Active Management Technology (AMT) in the BIOS  
extension. Configuration options: [Enabled] [Disabled]  
iAMT H/W is always enabled. This option just controls the BIOS extension execution.  
If enabled, this requires additional firmware in the SPI device.  
The following two items become configurable only when you set the Intel®AMT item to  
[Enabled].  
Invoke MEBx [Disabled]  
This item become configurable only when the previous item is set to [Enabled] and allows  
you to enable or disable this function. Configuration options: [Enabled] [Disabled]  
Un-Configure ME [Disabled]  
Sets this item to [Disabled] to unconfigure AMT/ME without using a password or set it to  
[Enabled] to use a password. Configuration options: [Enabled] [Disabled]  
2-22  
Chapter 2: Getting started  
WatchDog [Disabled]  
When set to [Enabled], the WatchDog Timer will monitor the time taken for each task  
performed by a software or hardware. Configuration options: [Enabled] [Disabled]  
The following two items become configurable only when you set the WatchDog Timer item  
to [Enabled].  
OS Timer [0]  
Use the <+> and <-> keys to adjust the value or key in a number directly.  
BIOS Timer [0]  
Use the <+> and <-> keys to adjust the value or key in a number directly.  
2.5.6  
USB Configuration  
The items in this menu allow you to change the USB-related features.  
The USB Devices item shows the auto-detected values. If no USB device is detected, the  
item shows None.  
Intel USB2.0 EHCI Controller [Enabled]  
[Disabled]  
[Enabled]  
Disables the Intel® USB2.0 EHCI controller.  
Enables the Intel® USB2.0 EHCI controller.  
Legacy USB Support [Enabled]  
[Enabled]  
[Disabled]  
[Auto]  
Enables the support for USB devices on legacy operating systems (OS).  
The USB devices can be used only for the BIOS setup program.  
Allows the system to detect the presence of USB devices at startup. If  
detected, the USB controller legacy mode is enabled. If no USB device is  
detected, the legacy USB support is disabled.  
Legacy USB3.0 Support [Enabled]  
[Enabled]  
Enables the support for USB 3.0 devices on legacy operating systems  
(OS).  
[Disabled]  
Disables the function.  
Intel® xHCI Mode [Smart Auto]  
[Auto]  
Keeps the last operation of xHCI controller in OS during bootup.  
[Smart Auto]  
[Enabled]  
[Disabled]  
Enables the operation of xHCI controller.  
Enables the function.  
Disables the function.  
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ASUS B75M-A  
EHCI Hand-off [Disabled]  
[Enabled]  
Enables the support for operating systems without an EHCI hand-off  
feature.  
[Disabled]  
Disables the function.  
USB Single Port Control  
USB3_1~USB3_4 [Enabled]  
Allows you to enable or disable an individual USB port. Refer to the section 1.3.3  
Motherboard layout in this user manual for the locations of the USB ports.  
USB1~8 [Enabled]  
Allows you to enable or disable an individual USB port. Refer to the section 1.3.3  
Motherboard layout in this user manual for the locations of the USB ports.  
2.5.7  
Onboard Devices Configuration  
HD Audio Controller [Enabled]  
[Enabled]  
[Disabled]  
Enables the HD Audio Device.  
Disables the HD Audio Device.  
The following item appears only when you set the HD Audio Controller item to [Enabled].  
Front Panel Type [HD]  
Allows you to set the front panel audio connector (AAFP) mode to legacy AC’97 or high-  
definition audio depending on the audio standard that the front panel audio module supports.  
[HD]  
Sets the front panel audio connector (AAFP) mode to high definition audio.  
[AC97]  
Sets the front panel audio connector (AAFP) mode to legacy AC’97  
Realtek LAN Controller [Enabled]  
[Enabled]  
[Disabled]  
Enables the Realtek LAN controller.  
Disables the controller.  
Realtek PXE OPROM [Disabled]  
This item appears only when you set the previous item to [Enabled] and allows you to enable  
or disable the PXE OptionRom of the Realtek LAN controller.  
Configuration options: [Enabled] [Disabled]  
2.5.8  
APM  
Restore AC Power Loss [Power Off]  
[Power On]  
[Power Off]  
[Last State]  
The system goes into on state after an AC power loss.  
The system goes into off state after an AC power loss.  
The system goes into either off or on state, whatever the system state was  
before the AC power loss.  
2-24  
Chapter 2: Getting started  
Power On By PCIE/PCI [Disabled]  
[Disabled]  
Disables the PCIE/PCI devices to generate a wake-on-LAN feature of the  
Intel®/Realtek LAN device.  
[Enabled]  
Enables the PCIE/PCI devices to generate a wake-on-LAN feature of the  
Intel®/Realtek LAN device.  
Power On By RTC [Disabled]  
[Disabled]  
[Enabled]  
Disables RTC to generate a wake event.  
When set to [Enabled], the items RTC Alarm Date (Days) and Hour/  
Minute/Second will become user-configurable with set values.  
2.5.9  
Network Stack  
Network Stack [Disabled]  
This item allows user to disable or enable the UEFI network stack. Configuration options:  
[Disabled] [Enabled]  
The following two items appear only when you set the previous item to [Enabled].  
Ipv4 PXE Support [Enabled]  
This item allows user to disable or enable the Ipv4 PXE Boot support. Configuration options:  
[Disabled] [Enabled]  
Ipv6 PXE Support [Enabled]  
This item allows user to disable or enable the Ipv6 PXE Boot support. Configuration options:  
[Disabled] [Enabled]  
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ASUS B75M-A  
2.6  
Monitor menu  
The Monitor menu displays the system temperature/power status, and allows you to change  
the fan settings.  
2.6.1  
CPU Temperature / MB Temperature [xxxºC/xxxºF]  
The onboard hardware monitor automatically detects and displays the CPU and motherboard  
temperatures. Select Ignore if you do not wish to display the detected temperatures.  
2.6.2  
CPU / Chassis Fan Speed [xxxx RPM] or [Ignore] /  
[N/A]  
The onboard hardware monitor automatically detects and displays the CPU / chassis fan  
speeds in rotations per minute (RPM). If the fan is not connected to the motherboard, the field  
shows N/A. Select Ignore if you do not wish to display the detected speed.  
2.6.3  
[Disabled]  
CPU Q-Fan Control [Enabled]  
Disables the CPU Q-Fan control feature.  
Enables the CPU Q-Fan control feature.  
[Enabled]  
CPU Fan Speed Low Limit [200 RPM]  
This item appears only when you enable the CPU Q-Fan Control feature and allows you to  
disable or set the CPU fan warning speed.  
Configuration options: [Ignore] [100RPM] [200RPM] [300 RPM] [400 RPM] [500 RPM]  
2-26  
Chapter 2: Getting started  
CPU Fan Profile [Standard]  
This item appears only when you enable the CPU Q-Fan Control feature and allows you to  
set the appropriate performance level of the CPU fan.  
[Standard]  
Sets to [Standard] to make the CPU fan automatically adjust depending on  
the CPU temperature.  
[Silent]  
[Turbo]  
[Manual]  
Sets to [Silent] to minimize the fan speed for quiet CPU fan operation.  
Sets to [Turbo] to achieve maximum CPU fan speed.  
Sets to [Manual] to assign detailed fan speed control parameters.  
The following four items appear only when you set CPU Fan Profile to [Manual].  
CPU Upper Temperature [70]  
Use the <+> and <-> keys to adjust the upper limit of the CPU temperature. The values  
range from 20ºC to 75ºC.  
CPU Fan Max. Duty Cycle(%) [100]  
Use the <+> and <-> keys to adjust the maximum CPU fan duty cycle. The values  
range from 0% to 100%. When the CPU temperature reaches the upper limit, the CPU  
fan will operate at the maximum duty cycle.  
CPU Lower Temperature [20]  
Displays the lower limit of the CPU temperature.  
CPU Fan Min. Duty Cycle(%) [20]  
Use the <+> and <-> keys to adjust the minimum CPU fan duty cycle. The values  
range from 0% to 100%. When the CPU temperature is under the lower limit, the CPU  
fan will operate at the minimum duty cycle.  
2.6.4  
[Disabled]  
Chassis Q-Fan Control [Enabled]  
Disables the Chassis Q-Fan control feature.  
Enables the Chassis Q-Fan control feature.  
[Enabled]  
Chassis Fan Speed Low Limit [600 RPM]  
This item appears only when you enable the Chassis Q-Fan Control feature and allows you  
to disable or set the chassis fan warning speed.  
Configuration options: [Ignore] [200RPM] [300 RPM] [400 RPM] [500 RPM] [600 RPM]  
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ASUS B75M-A  
Chassis Fan Profile [Standard]  
This item appears only when you enable the Chassis Q-Fan Control feature and allows you  
to set the appropriate performance level of the chassis fan.  
[Standard]  
Sets to [Standard] to make the chassis fan automatically adjust depending  
on the chassis temperature.  
[Silent]  
[Turbo]  
[Manual]  
Sets to [Silent] to minimize the fan speed for quiet chassis fan operation.  
Sets to [Turbo] to achieve maximum chassis fan speed.  
Sets to [Manual] to assign detailed fan speed control parameters.  
The following four items appear only when you set Chassis Fan Profile to [Manual].  
Chassis Upper Temperature [70]  
Use the <+> and <-> keys to adjust the upper limit of the CPU temperature. The values  
range from 20ºC to 90ºC.  
Chassis Fan Max. Duty Cycle(%) [100]  
Use the <+> and <-> keys to adjust the maximum chassis fan duty cycle. The values  
range from 40% to 100%. When the chassis temperature reaches the upper limit, the  
chassis fan will operate at the maximum duty cycle.  
Chassis Lower Temperature [20]  
Displays the lower limit of the chassis temperature.  
CPU Fan Min. Duty Cycle(%) [40]  
Use the <+> and <-> keys to adjust the minimum chassis fan duty cycle. The values  
range from 40% to 100%. When the chassis temperature is under 40ºC, the chassis  
fan will operate at the minimum duty cycle.  
2.6.5  
CPU Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage  
The onboard hardware monitor automatically detects the voltage output through the onboard  
voltage regulators. Select Ignore if you do not want to detect this item.  
2.6.6  
Anti Surge Support [Enabled]  
This item allows you to enable or disable the Anti Surge function.  
Configuration options: [Disabled] [Enabled]  
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Chapter 2: Getting started  
2.7  
Boot menu  
The Boot menu items allow you to change the system boot options.  
2.7.1  
Fast Boot [Enabled]  
[Enabled]  
Select to accelerate the boot speed.  
[Disabled]  
Select to go back to normal boot.  
The following four items appear when you set Fast Boot to [Enabled].  
USB Support [Partial Initialization]  
[Disabled]  
All USB devices will not be available until OS boot up for the  
fastest POST time.  
[Full Initialization]  
[Partial Initialization]  
All USB devices will be available during POST. This process will  
extend the POST time.  
For a faster POST time, only the USB ports with keyboard and  
mouse connections will be detected.  
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ASUS B75M-A  
PS/2 Keyboard and Mouse Support [Auto]  
Select any of these settings when PS/2 keyboard and mouse are installed. These settings  
only apply when Fast Boot is enabled.  
[Auto]  
For a faster POST time, PS/2 devices will only be available when the  
system boots up or rebooted when the PS/2 devices have not been  
reconnected or changed. If you disconnect or change PS/2 devices before  
restarting the system, PS/2 devices will not be available and BIOS setup  
program will not be accessible via PS/2 devices.  
[Full Initialization] For full system control, PS/2 devices will be available during POST at any  
circumstances. This process will extend POST time.  
[Disabled]  
For the fastest POST time, all PS/2 devices will not be available until your  
computer enters the operating system.  
Network Stack Driver Support [Disabled]  
[Disabled]  
[Enabled]  
Select to skip the network stack driver from loading during POST.  
Select to load the network stack driver during POST.  
Next Boot after AC Power Loss [Normal Boot]  
[Normal Boot]  
[Fast Boot]  
Returns to normal boot on the next boot after AC power loss.  
Accelerates the boot speed on the next boot after AC power loss.  
2.7.2  
[Enabled]  
Boot Logo Display [Enabled]  
Displays the boot logo during POST.  
Hides the boot logo during POST.  
[Disabled]  
Boot Logo Size Control [Auto]  
[Auto]  
Alutomatically adjusts the boot logo size for Windows® requirements.  
[Full screen]  
Maximizes the boot logo size.  
POST Delay Time [3 sec]  
This item appears only when you set Boot Logo Display to [Enabled]. This item allows you  
to select the desired additional POST wait time to easily enter the BIOS setup. You can only  
execute the POST delay time during Normal Boot. The values range from 0 to 10 seconds.  
Post Report [5 sec]  
This item appears only when you set Boot Logo Display to [Disabled] and allows you to set  
the waiting time for the system to display the post report. Configuration options: [1 sec] [2  
sec] [3 sec] [4 sec] [5 sec] [6 sec] [7 sec] [8 sec] [9 sec] [10 sec] [Until Press ESC]  
2.7.3  
[On]  
Bootup NumLock State [On]  
Sets the power-on state of the NumLock to [On].  
[Off]  
Sets the power-on state of the NumLock to [Off].  
2.7.4  
Wait for ‘F1’ If Error [Enabled]  
When this item is set to [Enabled], the system waits for the F1 key to be pressed when error  
occurs. Configuration options: [Disabled] [Enabled]  
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Chapter 2: Getting started  
2.7.5  
Option ROM Messages [Force BIOS]  
[Force BIOS]  
The third-party ROM messages will be forced to display during the boot  
sequence.  
[Keep Current] The third-party ROM messages will be displayed only if the third-party  
manufacturer had set the add-on device to do so.  
2.7.6  
[Enabled]  
Interrupt 19 Capture [Disabled]  
Allows the option ROMs to trap Interrupt 19.  
Disables this function.  
[Disabled]  
2.7.7  
Setup Mode [EZ Mode]  
[Advanced Mode] Sets Advanced Mode as the default screen for entering the BIOS setup  
program.  
[EZ Mode]  
Sets EZ Mode as the default screen for entering the BIOS setup program.  
2.7.8  
CSM (Compatibility Support Module)  
Allows you to configure the CSM (Compatibility Support Module) items to fully support the  
various VGA, bootable devices and add-on devices for better compatibility.  
Launch CSM [Enabled]  
[Auto]  
The system automatically detects the bootable devices and the add-on  
devices.  
[Enabled]  
[Disabled]  
For better compatibility, enable the CSM to fully support the non-UEFI  
driver add-on devices or the Windows® UEFI mode.  
Disable the CSM to fully support the Windows® Security Update and  
Security Boot.  
The following four items appear when you set Launch CSM to [Enabled].  
Boot Devices Control [UEFI and Legacy OpROM]  
Allows you to select the type of devices that you want to boot up. Configuration options:  
[UEFI and Legacy OpROM] [Legacy OpROM only] [UEFI only]  
Boot from Network Devices [Legacy OpROM first]  
Allows you to select the type of network devices that you want to launch. Configuration  
options: [Legacy OpROM first] [UEFI driver first] [Ignore]  
Boot from Storage Devices [Legacy OpROM first]  
Allows you to select the type of storage devices that you want to launch. Configuration  
options: [Both, Legacy OpROM first] [Both, UEFI first] [Legacy OpROM first] [UEFI driver first]  
[Ignore]  
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ASUS B75M-A  
Boot from PCIe/PCI Expansion Devices [Legacy OpROM first]  
Allows you to select the type of PCIe/PCI expansion devices that you want to launch.  
Configuration options: [Legacy OpROM first] [UEFI driver first]  
2.7.10  
Security Boot  
Allows you to configure the Windows® Secure Boot settings and manage its keys to protect  
the system from unauthorized access and malwares during POST.  
OS Type [Windows UEFI Mode]  
Allows you to select your installed operating system.  
[Windows UEFI mode]  
Executes the Microsoft® Secure Boot check. Only select this  
option when booting on Windows® UEFI mode or other Microsoft®  
Secure Boot compliant OS.  
[Other OS]  
Get the optimized function when booting on Windows® non-UEFI  
mode, Windows® Vista/XP, or other Microsoft® Secure Boot  
non-compliant OS. Only on Windows® UEFI mode that Microsoft®  
Secure Boot can function properly.  
The following item appears when OS Type is set to [Windows UEFI Mode].  
Key Management  
This item appears only when you set Secure Boot Mode to [Custom]. It allows you to manage  
the Secure Boot keys.  
Manage the Secure Boot Keys (PK, KEK, db, dbx)  
Clear Secure Boot keys  
This item appears only when you load the default Secure Boot keys. This  
item allows you to clear all default Secure Boot keys.  
PK Management  
The Platform Key (PK) locks and secures the firmware from any non-permissible  
changes. The system verifies the PK before your system enters the OS.  
Load PK from File  
Allows you to load the downloaded PK from a USB storage device.  
Copy PK to File  
Allows you to store the PK to a USB storage device.  
Delete PK  
Allows you to delete the PK from your system. Once the PK is deleted, all  
the system’s Secure Boot keys will not be active. Configuration options:  
[Yes] [No]  
The PK file must be formatted as a UEFI variable structure with time-based authenticated  
variable.  
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Chapter 2: Getting started  
KEK Management  
The KEK (Key-exchange Key or Key Enrollment Key) manages the Signature database  
(db) and Revoked Signature database (dbx).  
Key-exchange Key (KEK) refers to Microsoft® Secure Boot Key-Enrollment Key (KEK).  
Load KEK from File  
Allows you to load the downloaded KEK from a USB storage device.  
Copy KEK to File  
Allows you to store the KEK to a USB storage device.  
Delete the KEK  
Allows you to delete the KEK from your system. Configuration options:  
[Yes] [No]  
Append KEK from file  
Allows you to load the additional KEK from a storage device for an  
additional db and dbx loaded management.  
The KEK file must be formatted as a UEFI variable structure with time-based authenticated  
variable.  
DB Management  
The db (Authorized Signature database) lists the signers or images of UEFI  
applications, operating system loaders, and UEFI drivers that you can load on the  
single computer.  
Load DB from File  
Allows you to load the downloaded DB from a USB storage device.  
Copy DB to file  
Allows you to store the db to a USB storage device.  
Delete the DB  
Allows you to delete the db file from your system. Configuration options:  
[Yes] [No]  
Append DB from file  
Allows you to load the additional DB from a storage device so that more  
images can be loaded securely.  
The DB file must be formatted as a UEFI variable structure with time-based authenticated  
variable.  
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ASUS B75M-A  
DBX Management  
The dbx (Revoked Signature database) lists the forbidden images of db items that are  
no longer trusted and cannot be loaded.  
Load DBX from File  
Allows you to load the downloaded DBX from a USB storage device.  
Copy DBX to file  
Allows you to store the DBX to a USB storage device.  
Delete the DBX  
Allows you to delete the DBX file from your system. Configuration options:  
[Yes] [No]  
Append DBX from file  
Allows you to load the additional DBX from a storage device so that more  
db’s images cannot be loaded.  
The DBX file must be formatted as a UEFI variable structure with time-based authenticated  
variable.  
2.7.11  
Boot Option Priorities  
These items specify the boot device priority sequence from the available devices. The  
number of device items that appears on the screen depends on the number of devices  
installed in the system.  
To select the boot device during system startup, press <F8> when ASUS Logo  
appears.  
To access Windows OS in Safe Mode, do any of the following:  
Press <F5> when ASUS Logo appears.  
Press <F8> after POST.  
2.7.12  
Boot Override  
These items displays the available devices. The number of device items that appears on  
the screen depends on the number of devices installed in the system. Click an item to start  
booting from the selected device.  
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Chapter 2: Getting started  
2.8  
Tools menu  
The Tools menu items allow you to configure options for special functions. Select an item  
then press <Enter> to display the submenu.  
2.8.1  
ASUS EZ Flash 2 Utility  
Allows you to run ASUS EZ Flash 2. Press [Enter] to launch the ASUS EZ Flash 2 screen.  
For more details, see section 2.1.2 ASUS EZ Flash 2.  
2.8.2  
ASUS O.C. Profile  
This item allows you to store or load multiple BIOS settings.  
The Setup Profile Status items show Not Installed if no profile is created.  
Save to Profile  
Allows you to save the current BIOS settings to the BIOS Flash, and create a profile. Key in a  
profile number from one to eight, press <Enter>, and then select Yes.  
Load from Profile  
Allows you to load the previous BIOS settings saved in the BIOS Flash. Key in the profile  
number that saved your CMOS settings, press <Enter>, and then select Yes.  
DO NOT shut down or reset the system while updating the BIOS to prevent the  
system boot failure!  
We recommend that you update the BIOS file only coming from the same memory/  
CPU configuration and BIOS version.  
2.8.3  
ASUS SPD Information  
DIMM Slot # [DIMM_A1]  
Displays the Serial Presence Detect (SPD) information of the DIMM module installed on the  
selected slot. Configuration options: [DIMM_A1] [DIMM_B1]  
2-35  
ASUS B75M-A  
2.9  
Exit menu  
The Exit menu items allow you to load the optimal default values for the BIOS items, and  
save or discard your changes to the BIOS items. You can access the EZ Mode from the Exit  
menu.  
Load Optimized Defaults  
This option allows you to load the default values for each of the parameters on the Setup  
menus. When you select this option or if you press <F5>, a confirmation window appears.  
Select Yes to load the default values.  
Save Changes & Reset  
Once you are finished making your selections, choose this option from the Exit menu to  
ensure the values you selected are saved. When you select this option or if you press <F10>,  
a confirmation window appears. Select Yes to save changes and exit.  
Discard Changes & Exit  
This option allows you to exit the Setup program without saving your changes. When you  
select this option or if you press <Esc>, a confirmation window appears. Select Yes to discard  
changes and exit.  
ASUS EZ Mode  
This option allows you to enter the EZ Mode screen.  
Launch EFI Shell from filesystem device  
This option allows you to attempt to launch the EFI Shell application (shellx64.efi) from one of  
the available devices that have a filesystem.  
2-36  
Chapter 2: Getting started  
Appendices  
Notices  
Federal Communications Commission Statement  
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two  
conditions:  
This device may not cause harmful interference.  
This device must accept any interference received including interference that may cause  
undesired operation.  
This equipment has been tested and found to comply with the limits for a Class B digital  
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide  
reasonable protection against harmful interference in a residential installation. This  
equipment generates, uses and can radiate radio frequency energy and, if not installed  
and used in accordance with manufacturer’s instructions, may cause harmful interference  
to radio communications. However, there is no guarantee that interference will not occur  
in a particular installation. If this equipment does cause harmful interference to radio or  
television reception, which can be determined by turning the equipment off and on, the user  
is encouraged to try to correct the interference by one or more of the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and receiver.  
Connect the equipment to an outlet on a circuit different from that to which the receiver is  
connected.  
Consult the dealer or an experienced radio/TV technician for help.  
The use of shielded cables for connection of the monitor to the graphics card is required  
to assure compliance with FCC regulations. Changes or modifications to this unit not  
expressly approved by the party responsible for compliance could void the user’s authority  
to operate this equipment.  
IC: Canadian Compliance Statement  
Complies with the Canadian ICES-003 Class B specifications. This device complies with RSS  
210 of Industry Canada. This Class B device meets all the requirements of the Canadian  
interference-causing equipment regulations.  
This device complies with Industry Canada license exempt RSS standard(s). Operation is  
subject to the following two conditions: (1) this device may not cause interference, and (2)  
this device must accept any interference, including interference that may cause undesired  
operation of the device.  
Cut appareil numérique de la Classe B est conforme à la norme NMB-003 du Canada.  
Cet appareil numérique de la Classe B respecte toutes les exigences du Règlement sur le  
matériel brouilleur du Canada.  
Cet appareil est conforme aux normes CNR exemptes de licence d’Industrie Canada. Le  
fonctionnement est soumis aux deux conditions suivantes :  
(1) cet appareil ne doit pas provoquer d’interférences et  
(2) cet appareil doit accepter toute interférence, y compris celles susceptibles de provoquer  
un fonctionnement non souhaité de l’appareil.  
A-1  
B75M-A  
Canadian Department of Communications Statement  
This digital apparatus does not exceed the Class B limits for radio noise emissions from  
digital apparatus set out in the Radio Interference Regulations of the Canadian Department  
of Communications.  
This class B digital apparatus complies with Canadian ICES-003.  
VCCI: Japan Compliance Statement  
VCCI Class B Statement  
KC: Korea Warning Statement  
REACH  
Complying with the REACH (Registration, Evaluation, Authorisation, and Restriction of  
Chemicals) regulatory framework, we published the chemical substances in our products at  
DO NOT throw the motherboard in municipal waste. This product has been designed to  
enable proper reuse of parts and recycling. This symbol of the crossed out wheeled bin  
indicates that the product (electrical and electronic equipment) should not be placed in  
municipal waste. Check local regulations for disposal of electronic products.  
DO NOT throw the mercury-containing button cell battery in municipal waste. This symbol  
of the crossed out wheeled bin indicates that the battery should not be placed in municipal  
waste.  
ASUS Recycling/Takeback Services  
ASUS recycling and takeback programs come from our commitment to the highest standards  
for protecting our environment. We believe in providing solutions for you to be able to  
responsibly recycle our products, batteries, other components as well as the packaging  
materials. Please go to http://csr.asus.com/english/Takeback.htm for detailed recycling  
information in different regions.  
A-2  
Appendices  
ASUS contact information  
ASUSTeK COMPUTER INC.  
Address  
Telephone  
Fax  
E-mail  
Web site  
15 Li-Te Road, Peitou, Taipei, Taiwan 11259  
+886-2-2894-3447  
+886-2-2890-7798  
Technical Support  
Telephone  
Online support  
+86-21-38429911  
support.asus.com  
ASUS COMPUTER INTERNATIONAL (America)  
Address  
Telephone  
Fax  
800 Corporate Way, Fremont, CA 94539, USA  
+1-812-282-3777  
+1-510-608-4555  
usa.asus.com  
Web site  
Technical Support  
Telephone  
Support fax  
+1-812-282-2787  
+1-812-284-0883  
support.asus.com  
Online support  
ASUS COMPUTER GmbH (Germany and Austria)  
Address  
Fax  
Harkort Str. 21-23, D-40880 Ratingen, Germany  
+49-2102-959911  
Web site  
Online contact  
Technical Support  
Telephone  
Support Fax  
+49-1805-010923*  
+49-2102-9599-11  
support.asus.com  
Online support  
* EUR 0.14/minute from a German fixed landline; EUR 0.42/minute from a mobile phone.  
Manufacturer:  
Address:  
ASUSTeK Computer Inc.  
4F, No. 150, LI-TE RD., PEITOU, TAIPEI 112,  
TAIWAN R.O.C.  
Authorised representative in  
Europe:  
ASUS Computer GmbH  
Address:  
HARKORT STR. 21-23, 40880 RATINGEN,  
GERMANY  
A-3  
B75M-A  
A-4  
Appendices  

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