Asus Computer Hardware F2A55 M LK User Manual

F2A55-M LK Series  
• F2A55-M LK  
• F2A55-M LK PLUS  
Contents  
Chapter 1:  
Chapter 2:  
iii  
iv  
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 devices on it, 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 become wet.  
Place the product on a stable surface.  
If you encounter technical problems with the product, contact a qualified service  
technician or your retailer.  
vi  
 
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.  
Chapter 2: BIOS information  
This chapter tells how to change system settings through the BIOS Setup menus.  
Detailed descriptions of the BIOS parameters are also provided.  
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.  
vii  
 
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 trying to  
complete a task.  
CAUTION: Information to prevent damage to the components when trying to  
complete 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 (+).  
viii  
F2A55-M LK Series specifications summary  
APU  
FM2 socket for AMD® A-Series accelerated processors (APU) with AMD  
Radeon™ HD 7000 Series graphics, up to 4 CPU cores  
AMD® Turbo Core Technology 3.0 support  
Microsoft® DirectX® 11 support  
The AMD® Turbo Core Technology 3.0 support depends on the APU types.  
Refer to www.asus.com for the AMD® APU support list.  
Chipset  
Memory  
AMD® A55 FCH  
2 x 240-pin DIMM slots support maximum 32GB unbuffered non-ECC  
DDR3 2400(O.C.) / 2250(O.C.) / 2200(O.C.) / 2133(O.C.) / 2000(O.C.) /  
1866 / 1600 / 1333 / 1066 MHz memory modules  
Dual-channel memory architecture  
The maximum 32GB memory capacity can be supported with 16GB or above  
DIMMs. ASUS will update the memory QVL once the DIMMs are available in the  
market.  
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.  
Graphics  
Integrated AMD® Radeon™ HD 7000 series graphics in Trinity APU  
Supports DVI-D and D-Sub ports  
Supports DVI with max. resolution 2560x1600@60Hz  
Supports D-Sub with max. resolution 1920x1600@60Hz  
Supports Microsoft® DirectX 11  
Expansion slots  
Storage / RAID  
1 x PCIe 2.0 x16 slot  
2 x PCIe 2.0 x1 slots  
1 x PCI slot  
AMD® A55 FCH:  
-
6 x Serial ATA 3.0Gb/s connectors support RAID 0, RAID 1, RAID 10  
and JBOD configurations  
LAN  
Realtek® 8111F PCIe Gigabit LAN controller  
Audio  
ALC887 8-channel High Definition Audio CODEC  
Use a chassis with HD audio module in the front panel to support an 8-channel  
audio output.  
USB  
AMD® A55 FCH:  
10 x USB 2.0/1.1 ports (6 ports at the mid-board, 4 ports at the back  
panel)  
-
(continued on the next page)  
ix  
 
F2A55-M LK Series specifications summary  
ASUS unique  
features  
ASUS DIGI+ VRM  
ASUS 3+2 Phase Power Design  
Network iControl  
ASUS EPU  
ASUS AI Suite II  
ASUS UEFI BIOS EZ Mode featuring friendly graphics user interface  
ASUS TurboV  
ASUS Anti-Surge Protection  
ASUS Fan Xpert  
ASUS CrashFree BIOS 3  
ASUS EZ Flash 2  
ASUS MyLogo 2™  
Special features  
100% All high quality conductive polymer (F2A55-M LK PLUS only)  
Back Panel I/O  
ports  
1 x PS/2 mouse port (green)  
1 x PS/2 keyboard port (purple)  
1 x DVI-D port  
1 x D-Sub output port  
1 x LAN (RJ-45) port  
4 x USB 2.0/1.1 ports  
8-channel audio I/O ports (3-jack)  
Internal I/O  
connectors /  
buttons / switches  
3 x USB 2.0/1.1 connectors support additional 6 USB 2.0/1.1 ports  
6 x SATA 3.0Gb/s connectors  
1 x COM connector  
1 x LPT connector  
1 x CPU fan connector (4-pin)  
1 x Chassis fan connector (3-pin)  
1 x Front panel audio connector  
1 x S/PDIF output connector  
1 x System panel connector  
1 x Speaker connector  
1 x 24-pin EATX power connector  
1 x 4-pin ATX 12V power connector  
BIOS  
64 Mb Flash ROM, UEFI AMI BIOS, PnP, DMI 2.0, WfM 2.0, SM  
BIOS 2.7, ACPI 2.0a, Multi-language BIOS, ASUS EZ Flash 2, ASUS  
CrashFreen BIOS 3, F12 Printscreen function, F3 Shortcut function and  
ASUS DRAM SPD (Serial Presence Detect) memory information  
Support DVD  
Drivers  
ASUS Update  
ASUS utilities  
Anti-Virus software (OEM version)  
Form factor  
uATX form factor: 9.6 in x 8.2 in (24.4 cm x 20.8 cm)  
Specifications are subject to change without notice.  
x
Package contents  
Check your motherboard package for the following items.  
20.8cm(8.2in)  
KBMS  
CPU_FAN  
DIGI  
+VRM  
ATX12V  
USB34  
COM  
LAN_USB12  
CHA_FAN  
AUDIO  
F2A55-M LK PLUS  
SB_PWR  
PCIEX16  
RTL  
8111F  
SATA3G_4  
Lithium Cell  
CMOS Power  
PCIEX1_1  
AMD®  
A55  
SATA3G_3  
Super  
I/O  
PCIEX1_2  
SATA3G_2  
SATA3G_1  
PCI1  
64Mb  
BIOS  
USBPW5-10  
USB56  
CLRTC  
ALC  
887  
SPDIF_OUT  
USB910  
USB78  
LPT  
AAFP  
SPEAKER F_PANEL  
2 x Serial ATA 3.0 Gb/s  
cables  
ASUS F2A55-M LK Series motherboard  
User Guide  
1 x I/O Shield  
User Guide  
Support DVD  
F2A55-M LK Series motherboards include F2A55-M LK PLUS and F2A55-M LK  
models. The package contents vary from models.  
If any of the above items is 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  
AMD® A-series accelerated processors with AMD® Radeon™ HD 7000 series  
graphics  
This motherboard supports AMD® A-series accelerated processor with AMD® Radeon™  
HD 7000 series graphics. This revolutionary APU (Accelerated Processing Unit) combines  
processing power and advanced DirectX 11 graphics in one small, energy-efficient design to  
enable accelerated performance and an industry-leading visual experience. It features Dual-  
channel DDR3 memory support and accelerates data transfer rate up to 5GT/s.  
AMD® A55 FCH chipset  
AMD® A55 FCH is designed to support up to 5GT/s interface speed and 6 x SATA 3.0Gb/s  
ports.  
Dual-Channel DDR3 2400(O.C.) / 2250(O.C.) / 2200(O.C.) / 2133(O.C.) / 2000(O.  
C.) / 1866 / 1600 / 1333 / 1066 MHz Support  
The motherboard supports the dual-channel DDR3 memory that features data transfer rates  
of DDR3 2400(O.C.) / 2250(O.C.) / 2200(O.C.) / 2133(O.C.) / 2000(O.C.) / 1866 / 1600 /  
1333 / 1066 MHz to boost the system’s performance, and to meet the higher bandwidth  
requirements of 3D graphics, multimedia, and Internet applications.  
8-channel high definition audio  
The onboard 8-channel HD audio (High Definition Audio, previously codenamed Azalia)  
CODEC enables high-quality 192KHz/24-bit audio output and jack-detect feature that  
automatically detects and identifies what types of peripherals are plugged into the audio  
I/O jacks and notifies users of inappropriate connection, which means there will be no more  
confusion of Line-in, Line-out, and Mic jacks.  
Gigabit LAN solution  
The onboard LAN controller is a highly integrated Gb LAN controller. It is enhanced with an  
ACPI management function to provide efficient power management for advanced operating  
systems.  
100% All High-quality Conductive Polymer Capacitors (F2A55-M LK PLUS  
only)  
This motherboard uses all high-quality conductive polymer capacitors for durability, improved  
lifespan, and enhanced thermal capacity.  
1-1  
ASUS F2A55-M LK Series  
 
1.1.2  
ASUS DIGI+ VRM  
DIGI+POWER CONTROL: Digital Power Design for the APU*  
ASUS motherboards using the AMD® A55 chipset employ precise digital voltage regulation  
for the APU, called DIGI+ VRM (Voltage Regulation Modules) digital power design. The APU  
voltage is adjusted via either carefully developed automated modes, or by using user-defined  
profiles. The effect is that DIGI+ VRM technology ensures greater energy efficiency and the  
most precise power delivery. Boosted by world-renowned ASUS quality, it creates an ideal  
computing platform for a diverse range of applications, from gaming to multimedia or office  
work and heavy multitasking. Engineered and tested to assure unmitigated performance,  
ASUS A55 boards with DIGI+ VRM remain efficient and accurate, for reliable application in  
every scenario.  
* DIGI+ VRM functions also available in FM2 socket compatible CPUs  
1.1.3  
ASUS Exclusive Features  
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.  
*
The ASUS Network iControl feature does not support Windows® XP/Vista operating systems.  
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.  
ASUS TurboV  
With its user-friendly interface, ASUS TurboV offers you the adrenaline rush of real-time  
overclocking without exiting or rebooting the OS. It also provides you with the ASUS OC  
profiles for the best overclocking settings in different scenarios.  
EPU  
EPU (Energy Processing Unit), the world’s first real-time system power-saving chip,  
automatically detects the current system load and intelligently moderates power usage.  
It offers a total system-wide energy optimization, reduces fan noise, and extends the  
component’s lifespan.  
1-2  
Chapter 1: Product introduction  
 
ASUS Anti-Surge Protection  
This special design protects expensive devices and the motherboard from damage caused  
by power surges from switching power supply unit (PSU).  
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.  
ASUS Fan Xpert  
ASUS Fan Xpert intelligently allows you to adjust the CPU fan speed based on different  
ambient temperatures, resulting to a quiet and cool computing environment.  
ASUS EZ Flash 2  
ASUS EZ Flash 2 is a user-friendly utility that allows you to update the BIOS without using a  
bootable floppy disk or an OS-based utility.  
ASUS MyLogo2™  
Turn your favorite photos into 256-color boot logos to personalize your system.  
ASUS CrashFree BIOS 3  
ASUS CrashFree BIOS 3 allows you to restore a corrupted BIOS file from a USB storage  
device that contains the BIOS file.  
C.P.R. (CPU Parameter Recall)  
The BIOS C.P.R. feature automatically restores the CPU default settings when the system  
hangs 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  
The motherboard is European Union´s Energy-related Products (ErP) ready, and ErP  
requires products to meet certain energy efficiency requirements in regards to energy  
consumptions. This is in line with ASUS vision of creating environment-friendly and energy-  
efficient products through product design and innovation to reduce carbon footprint of the  
product and thus mitigate environmental impacts.  
1-3  
ASUS F2A55-M LK Series  
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, switch off the ATX power supply and  
detach its power cord. Failure to do so may cause severe damage to the motherboard,  
peripherals, or components.  
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  
F2A55-M LK PLUS  
ON  
OFF  
Standby Power Powered Off  
F2A55-M LK PLUS Onboard LED  
1-4  
Chapter 1: Product introduction  
 
1.3  
Motherboard overview  
Placement direction  
1.3.1  
When installing the motherboard, ensure that you 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 below.  
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.  
Place this side towards  
the rear of the chassis.  
F2A55-M LK PLUS  
1-5  
ASUS F2A55-M LK Series  
 
1.3.3  
Motherboard layout  
F2A55-M LK Series motherboards include F2A55-M LK PLUS and F2A55-M LK models.  
The package contents vary from models. The layout illustrations in this user guide are for  
F2A55-M LK PLUS only.  
1
2
3
4
5
6
20.8cm(8.2in)  
KBMS  
CPU_FAN  
DIGI  
+VRM  
ATX12V  
3
USB34  
16  
COM  
LAN_USB12  
AUDIO  
CHA_FAN  
7
8
F2A55-M LK PLUS  
SB_PWR  
PCIEX16  
RTL  
8111F  
5
SATA3G_4  
SATA3G_3  
Lithium Cell  
CMOS Power  
PCIEX1_1  
AMD®  
A55  
Super  
I/O  
PCIEX1_2  
7
SATA3G_2  
SATA3G_1  
PCI1  
64Mb  
BIOS  
USBPW5-10  
ALC  
887  
SPDIF_OUT  
CLRTC  
USB910  
USB78  
USB56  
LPT  
AAFP  
SPEAKER F_PANEL  
2
15 14  
13  
12  
11  
10  
9
1-6  
Chapter 1: Product introduction  
 
1.3.4  
Layout contents  
Connectors/Jumpers/Slots/LED  
Page  
1-21  
1-21  
1-24  
1-7  
1. Keyboard power (3-pin KBPWR)  
2. USB device wake-up (3-pin USBPW1-4, 3-pin USBPW5-10)  
3. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)  
4. AMD FM2 socket  
5. CPU and chassis fan connectors (4-pin CPU_FAN and 3-pin CHA_FAN)  
6. DDR3 DIMM slots  
1-23  
1-11  
1-25  
1-4  
7. SATA 3.0Gb/s connectors (7-pin SATA3G_1~6)  
8. Standby power LED (SB_PWR)  
9. System panel connector (10-1 pin F_PANEL)  
10. Speaker connector (4-pin SPEAKER)  
11. Clear RTC RAM (3-pin CLRTC)  
1-26  
1-26  
1-20  
1-28  
1-25  
1-27  
1-27  
1-28  
12. USB 2.0 connectors (10-1 pin USB56, USB78, USB910)  
13. LPT connector (26-1 pin LPT)  
14. Digital audio connector (4-1 pin SPDIF_OUT)  
15. Front panel audio connector (10-1 pin AAFP)  
16. Serial port connector (10-1 pin COM)  
1.4  
Accelerated Processing Unit (APU)  
This motherboard comes with an FM2 socket designed for AMD® A-series accelerated  
processors with AMD® Radeon™ HD 7000 series graphics.  
Ensure that you use a APU designed for the FM2 socket. The APU fits in only one correct  
orientation. DO NOT force the APU into the socket to prevent bending the pins and  
damaging the APU!  
F2A55-M LK PLUS  
F2A55-M LK PLUS APU socket FM2  
1-7  
ASUS F2A55-M LK Series  
 
1.4.1  
1
APU installation  
2
3
4
1-8  
Chapter 1: Product introduction  
 
1.4.2  
APU heatsink and fan assembly installation  
Apply the Thermal Interface Material  
to the APU heatsink and APU before  
you install the heatsink and fan if  
necessary.  
To install the APU heatsink and fan assembly  
1
2
3
4
5
1-9  
ASUS F2A55-M LK Series  
 
To uninstall the APU heatsink and fan assembly  
1
2
3
4
5
1-10  
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 Modules  
(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  
DIMM_A1  
DIMM_B1  
F2A55-M LK PLUS  
Channel A  
Channel B  
F2A55-M LK PLUS 240-pin DDR3 DIMM sockets  
1-11  
ASUS F2A55-M LK Series  
 
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.  
We recommend that you install the memory modules from the blue slots for better  
overclocking capability.  
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:  
-
Install a maximum of 3GB system memory if you are using a 32-bit Windows®  
OS.  
-
Use a 64-bit Windows® OS if you want to install 4GB or more memory on the  
motherboard.  
This motherboard does not support DIMMs made up of 512Mb (64MB) chips or less.  
The maximum 32GB memory capacity can be supported with 16GB 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.  
F2A55-M LK Series Motherboard Qualified Vendors Lists (QVL)  
DDR3 2400 (O.C.) MHz capability  
DIMM socket  
support (Optional)  
Vendors Part No.  
Size  
SS/DS Chip Brand  
Chip NO.  
Timing  
Voltage  
1 DIMM 2 DIMMs  
G.SKILL  
KINGMAX FLLE88F-C8KKAA HAIS(XMP) 2GB  
Team TXD34096M2400HC9N-L 4GB  
F3-19200CL9D-4GBPIS(XMP) 4GB(2x 2GB) DS  
-
-
-
-
9-11-9-28  
1.65V  
SS  
DS  
10-11-10-30 1.8V  
SEC 128 HCH9 K4B2G0846D 9-11-11-28  
1.65V  
DDR3 2250 (O.C.) MHz capability  
DIMM socket  
support (Optional)  
Vendors  
Part No.  
Size  
SS/DS Chip Brand Chip NO. Timing  
Voltage  
1 DIMM 2 DIMMs  
KINGSTON KHX2250C9D3T1K2/4GX(XMP) 4GB(2x 2GB) DS  
-
-
-
1.65V  
1-12  
Chapter 1: Product introduction  
 
DDR3 2200 (O.C.) MHz capability  
DIMM socket  
support (Optional)  
Vendors  
Part No.  
Size  
SS/DS Chip Brand Chip NO. Timing  
Voltage  
1 DIMM 2 DIMMs  
GEIL  
GET34GB2200C9DC(XMP)  
GET38GB2200C9ADC(XMP)  
2GB  
4GB  
DS  
DS  
DS  
DS  
-
-
-
-
-
-
-
-
9-10-9-28 1.65V  
9-11-9-28 1.65V  
GEIL  
KINGMAX  
KINGMAX  
FLKE85F-B8KJAA-FEIS(XMP) 2GB  
FLKE85F-B8KJA FEIH(XMP) 4GB(2 x 2GB)  
-
-
-
1.5V-1.7V  
DDR3 2133 (O.C.) MHz capability  
DIMM socket  
support (Optional)  
SS/ Chip  
DS Brand  
Vendors  
Part No.  
Size  
Chip NO.  
Timing  
Voltage  
1 DIMM 2 DIMMs  
A-DATA  
AX3U2133GC2G9B-DG2(XMP)  
2GB  
SS  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
9-11-9-27 1.55~1.75V  
9-11-10-27 1.50V  
9-10-9-24 1.65V  
9-10-9-27 1.50V  
9-11-9-27 1.50V  
9-11-10-28 1.65V  
CORSAIR CMT16GX3M4X2133C9(XMP 1.3) 16GB(4GB x 4) DS  
CORSAIR CMT4GX3M2A2133C9(XMP)  
CORSAIR CMT4GX3M2B2133C9(XMP)  
CORSAIR CMT8GX3M2B2133C9(XMP)  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
8GB(4GB x 2) DS  
G.SKILL  
GEIL  
F3-17000CL9Q-16GBZH(XMP1.3) 16GB(4GB x 4) DS  
GU34GB2133C9DC(XMP) 4GB(2 x 2GB) DS  
9-9-9-28  
1.65V  
1.6V  
KINGSTON KHX2133C11D3T1K2/16GX(XMP) 16GB(8GB x 2) DS  
KINGSTON KHX21C11T1BK2/16X(XMP) 16GB(8GB x 2) DS  
-
-
-
1.6V  
KINGSTON KHX2133C9AD3T1K2/4GX(XMP) 4GB(2 x 2GB) DS  
KINGSTON KHX2133C9AD3T1K4/8GX(XMP) 8GB(4 x 2GB) DS  
KINGSTON KHX2133C9AD3T1FK4/8GX(XMP) 8GB(4 x 2GB) DS  
1.65V  
9-11-9-27 1.65V  
-
-
-
1.65V  
1.6V  
1.6V  
KINGSTON KHX21C11T1BK2/16X(XMP)  
KINGSTON KHX21C11T1BK2/8X(XMP)  
16GB(8GB x 2) DS  
8GB(4GB x 2) DS  
SEC 128  
HCH9  
Team  
TXD34096M2133HC9N-L  
4GB  
DS  
K4B2G0846D 9-11-11-28 1.65V  
DDR3 2000 (O.C.) MHz capability  
DIMM socket  
support (Optional)  
Chip  
Brand  
Vendors  
Part No.  
Size  
SS/DS  
Chip NO. Timing  
Voltage  
1 DIMM 2 DIMMs  
CORSAIR  
CORSAIR  
G.SKILL  
G.SKILL  
GEIL  
CMZ4GX3M2A2000C10(XMP)  
CMT6GX3M3A2000C8(XMP)  
F3-16000CL9D-4GBFLS(XMP)  
F3-16000CL6T-6GBPIS(XMP)  
GUP34GB2000C9DC(XMP)  
4GB(2 x 2GB) SS  
6GB(3 x 2GB) DS  
4GB(2 x 2GB) DS  
6GB(3 x 2GB) DS  
4GB(2 x 2GB) DS  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
10-10-10-27 1.50V  
8-9-8-24  
1.65V  
1.65V  
1.65V  
1.65V  
1.65V  
1.65V  
1.65V  
9-9-9-24  
6-9-6-24  
9-9-9-28  
KINGSTON KHX2000C9AD3W1K2/4GX(XMP) 4GB(2 x 2GB) DS  
KINGSTON KHX2000C9AD3W1K3/6GX(XMP) 6GB(3 x 2GB) DS  
KINGSTON KHX2000C9AD3T1K3/6GX(XMP) 6GB(3 x 2GB) DS  
-
-
-
DDR3 1866 MHz capability  
DIMM socket  
support (Optional)  
Chip  
Brand  
Vendors  
Part No.  
Size  
SS/DS  
Chip NO. Timing  
Voltage  
1 DIMM 2 DIMMs  
CORSAIR CMT4GX3M2A1866C9(XMP)  
CORSAIR CMT6GX3MA1866C9(XMP)  
CORSAIR CMZ8GX3M2A1866C9(XMP)  
4GB(2 x 2GB)  
6GB(3 x 2GB)  
8GB(2 x 4GB)  
DS  
DS  
DS  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
9-9-9-24  
9-9-9-24  
9-10-9-27  
9-10-9-28  
1.65V  
1.65V  
1.50V  
1.5V  
G.SKILL  
G.SKILL  
G.SKILL  
G.SKILL  
F3-14900CL9Q-16GBZL(XMP1.3)  
F3-14900CL10Q2-64GBZLD(XMP1.3) 64GB(8GB x 8) DS  
16GB(4GB x 4) DS  
10-11-10-30 1.5V  
F3-14900CL9D-8GBXL(XMP)  
F3-14900CL9Q-8GBXL(XMP)  
8GB(2 x 4GB)  
8GB(2GB x 4)  
DS  
DS  
9-10-9-28  
1.5V  
9-9-9-24  
1.6V  
KINGSTON KHX1866C9D3K4/16GX(XMP)  
KINGSTON KHX1866C9D3T1K3/6GX(XMP)  
KINGSTON KHX1866C11D3P1K2/8G  
16GB(4GB x 4) DS  
-
-
-
-
1.65V  
1.65V  
1.5V  
6GB(3 x 2GB)  
8GB(4GB x 2)  
8GB(4GB x 2)  
DS  
DS  
DS  
KINGSTON KHX1866C9D3K2/8GX(XMP)  
1.65V  
1-13  
ASUS F2A55-M LK Series  
DDR3 1600 MHz capability  
DIMM socket  
support  
(Optional)  
SS/ Chip  
DS Brand  
Vendors  
Part No.  
Size  
Chip NO.  
Timing  
Voltage  
1 DIMM 2 DIMMs  
3CCD-1509A  
EL1126T  
A-DATA  
A-DATA  
AM2U16BC2P1  
AM2U16BC4P2  
2GB  
4GB  
SS A-DATA  
DS A-DATA  
-
-
-
-
3CCD-1509A  
EL1126T  
A-DATA  
A-DATA  
AX3U1600GC4G9-2G(XMP)  
AX3U1600XC4G79-2X(XMP)  
8GB(2 x 4GB) DS  
8GB(2 x 4GB) DS  
-
-
-
-
9-9-9-24  
7-9-7-21  
1.55V-1.75V  
1.55V-1.75V  
Apacer  
KZZC  
AM5D5908D  
EQSCK  
Apacer  
78.B1GE3.9L10C  
4GB  
DS  
-
-
CORSAIR CMD12GX3M6A1600C8(XMP)  
CORSAIR CMZ32GX3M4X1600C10(XMP)  
CORSAIR CMP4GX3M2A1600C8(XMP)  
CORSAIR CMP4GX3M2A1600C9(XMP)  
CORSAIR CMP4GX3M2C1600C7(XMP)  
CORSAIR CMX4GX3M2A1600C9(XMP)  
CORSAIR CMX4GX3M2A1600C9(XMP)  
CORSAIR TR3X6G1600C8 G(XMP)  
CORSAIR TR3X6G1600C8D G(XMP)  
CORSAIR TR3X6G1600C9 G(XMP)  
CORSAIR CMP8GX3M2A1600C9(XMP)  
CORSAIR CMZ8GX3M2A1600C7R(XMP)  
CORSAIR CMX8GX3M4A1600C9(XMP)  
12GB(6 x 2GB) DS  
32GB(8GB x 4) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
6GB(3 x 2GB) DS  
6GB(3 x 2GB) DS  
6GB(3 x 2GB) DS  
8GB(2 x 4GB) DS  
8GB(2 x 4GB) DS  
8GB(4 x 2GB) DS  
6GB(3 x 2GB) DS  
4GB(2 x 2GB) SS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
6GB(3 x 2GB) DS  
8GB(2 x 4GB) DS  
8GB(2 x 4GB) DS  
8GB(2 x 4GB) DS  
16GB(4 x 4GB) DS  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
8-8-8-24  
1.65V  
10-10-10-27 1.50V  
8-8-8-24  
9-9-9-24  
7-8-7-20  
9-9-9-24  
9-9-9-24  
8-8-8-24  
8-8-8-24  
9-9-9-24  
9-9-9-24  
7-8-7-20  
9-9-9-24  
-
1.65V  
1.65V  
1.65V  
1.65V  
1.65V  
1.65V  
1.65V  
1.65V  
1.65V  
1.50V  
1.65V  
-
Crucial  
BL25664BN1608.16FF(XMP)  
F3-12800CL7D-4GBRH(XMP)  
F3-12800CL7D-4GBECO(XMP)  
F3-12800CL7D-4GBRM(XMP)  
F3-12800CL8D-4GBRM(XMP)  
F3-12800CL9D-4GBECO(XMP)  
F3-12800CL9D-4GBRL(XMP)  
F3-12800CL9T-6GBNQ(XMP)  
F3-12800CL7D-8GBRH(XMP)  
F3-12800CL8D-8GBECO(XMP)  
F3-12800CL9D-8GBRL(XMP)  
GET316GB1600C9QC(XMP)  
GV34GB1600C8DC(XMP)  
G.SKILL  
G.SKILL  
G.SKILL  
G.SKILL  
G.SKILL  
G.SKILL  
G.SKILL  
G.SKILL  
G.SKILL  
G.SKILL  
GEIL  
7-7-7-24  
7-7-8-24  
7-8-7-24  
8-8-8-24  
9-9-9-24  
9-9-9-24  
9-9-9-24  
7-8-7-24  
8-8-8-24  
9-9-9-24  
9-9-9-28  
8-8-8-28  
1.6V  
XMP 1.35V  
1.6V  
1.60V  
XMP 1.35V  
1.5V  
1.5V~1.6V  
1.6V  
XMP 1.35V  
1.5V  
1.6V  
GEIL  
2GB  
DS  
1.6V  
H5TQ2G83  
CFR PBC  
HYNIX  
HMT351U6CFR8C-PB  
4GB  
DS HYNIX  
-
-
KINGMAX FLGE85F-B8KJ9A FEIS(XMP)  
KINGMAX FLGE85F-B8MF7 MEEH(XMP)  
KINGSTON KHX1600C9D3P1K2/4G  
2GB  
2GB  
DS  
DS  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
7
-
4GB(2 x 2GB) SS  
12GB(3 x 4GB) DS  
-
1.5V  
1.65V  
1.65V  
1.65V  
1.5V  
1.5V  
1.65V  
KINGSTON KHX1600C9D3K3/12GX(XMP)  
9-9-9-27  
KINGSTON KHX1600C9D3T1BK3/12GX(XMP) 12GB(3 x 4GB) DS  
9-9-9-27  
KINGSTON KHX1600C9D3K4/16GX(XMP)  
KINGSTON KHX1600C10D3B1K2/16G  
KINGSTON KHX16C9K2/16  
16GB(4GB x 4) DS  
16GB(8GB x 2) DS  
16GB(8GB x 2) DS  
-
-
-
-
KINGSTON KHX1600C9AD3/2G  
2GB  
DS  
D1288JPN  
DPLD9U  
KINGSTON KVR1600D3N11/2G-ES  
2GB  
DS KTC  
11-11-11-28 1.35V-1.5V  
KINGSTON KHX1600C7D3K2/4GX(XMP)  
KINGSTON KHX1600C8D3K2/4GX(XMP)  
KINGSTON KHX1600C8D3T1K2/4GX(XMP)  
KINGSTON KHX1600C9D3K2/4GX(XMP)  
KINGSTON KHX1600C9D3LK2/4GX(XMP)  
KINGSTON KHX1600C9D3X2K2/4GX(XMP)  
KINGSTON KHX1600C9D3T1K3/6GX(XMP)  
KINGSTON KHX1600C9D3K3/6GX(XMP)  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
6GB(3 x 2GB) DS  
6GB(3 x 2GB) DS  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1.65V  
1.65V  
1.65V  
1.65V  
XMP 1.35V  
1.65V  
1.65V  
1.65V  
1.65V  
1.65V  
1.5V  
8
8
9
9
9-9-9-27  
-
9
KINGSTON KHX1600C9D3T1BK3/6GX(XMP) 6GB(3 x 2GB) DS  
9-9-9-27  
9-9-9-27  
-
KINGSTON KHX1600C9D3K2/8GX(XMP)  
KINGSTON KHX1600C9D3P1K2/8G  
8GB(2 x 4GB) DS  
8GB(2 x 4GB) DS  
Super  
WA160UX6G9  
Talent  
6GB(3 x 2GB) DS  
-
-
9
-
-
-
-
H5TQ2G83  
BFR PBC  
SanMax  
Apacer  
SMD-4G68HP-16KZ  
78.B1GE3.9L10C  
4GB  
4GB  
DS HYNIX  
Apacer  
DS  
AM5D5908  
DEQSCK  
-
KZZC  
KINGSTON KHX1600C10D3B1K2/16G  
KINGSTON KHX16C9K2/16  
16GB(8GB x 2) DS  
16GB(8GB x 2) DS  
-
-
-
-
-
-
1.5V  
1.5V  
N2CB4G8  
BOBN-DG  
Elixir  
M2X8G64CB8HB5N-DG(XMP)  
8GB  
DS Elixir 1213  
-
-
1-14  
Chapter 1: Product introduction  
DDR3 1333 MHz capability  
DIMM socket  
support  
(Optional)  
SS/  
DS  
Vendors  
Part No.  
Size  
Chip Brand Chip NO.  
Timing Voltage  
1 DIMM 2 DIMMs  
A-DATA  
A-DATA  
A-DATA  
AD3U1333C2G9  
AM2U139C2P1  
2GB  
2GB  
2GB  
SS A-DATA  
SS ADATA  
3CCD-1509HNA1126L  
-
-
-
-
3CCD-1509A EL1127T  
-
-
AX3U1333C2G9-BP  
SS  
-
-
1.25V-  
9-9-9-24 1.35V(low  
voltage)  
A-DATA  
AXDU1333GC2G9-2G(XMP)  
4GB(2 x 2GB) SS  
-
-
A-DATA  
A-DATA  
A-DATA  
Apacer  
AD63I1C1624EV  
AM2U139C4P2  
4GB  
4GB  
8GB  
2GB  
2GB  
2GB  
4GB  
DS A-Data  
DS ADATA  
DS ELPIDA  
DS Apacer  
DS Apacer  
DS Apacer  
DS Apacer  
3CCA-1509A  
3CCD-1509A EL1127T  
J4208BASE-DJ-F  
AM5D5808DEWSBG  
AM5D5808FEQSBG  
AM5D5808APQSBG  
AM5D5908CEHSBG  
-
-
-
-
-
9
-
-
-
-
-
-
-
-
-
SU3U1333W8G9-B  
78.A1GC6.9L1  
Apacer  
78.A1GC6.9L1  
Apacer  
AU02GFA33C9NBGC  
78.B1GDE.9L10C  
TR3X6G1333C9 G  
Apacer  
CORSAIR  
CORSAIR  
CORSAIR  
6GB(3x 2GB) SS  
-
-
-
9-9-9-24 1.50V  
9-9-9-24 1.60V  
9-9-9-24 1.50V  
CMD24GX3M6A1333C9(XMP) 24GB(6x4GB) DS  
-
TW3X4G1333C9D G  
4GB(2 x 2GB) DS  
-
256MBDCJGELC040  
1136  
CORSAIR  
CM3X4GA1333C9N2  
4GB  
4GB  
DS CORSAIR  
9-9-9-24  
-
CORSAIR  
CORSAIR  
Crucial  
CMX4GX3M1A1333C9  
CMD8GX3M4A1333C7  
CT25664BA1339.16FF  
BL25664BN1337.16FF (XMP)  
DS  
-
-
-
9-9-9-24 1.50V  
7-7-7-20 1.60V  
8GB(4 x 2GB) DS  
2GB  
6GB(3 x 2GB) DS  
-
DS Micron  
9KF27D9KPT  
-
9
-
Crucial  
-
7-7-7-24 1.65V  
1.35V(low  
voltage)  
ELPIDA  
EBJ21UE8EDF0-DJ-F  
2GB DS ELPIDA  
J1108EDSE-DJ-F  
-
G.SKILL  
G.SKILL  
F3-10666CL8D-4GBECO(XMP) 4GB(2 x 2GB) DS  
F3-10666CL7D-8GBRH(XMP) 8GB(2 x 4GB) DS  
-
-
-
-
8-8-8-24 XMP 1.35V  
7-7-7-21 1.5V  
1.3V(low  
9-9-9-24  
GEIL  
GG34GB1333C9DC  
4GB(2 x 2GB) DS GEIL  
GL1L128M88BA12N  
voltage)  
GEIL  
GEIL  
Hynix  
GV34GB1333C9DC  
GVP34GB1333C7DC  
HMT325U6BFR8C-H9  
4GB(2 x 2GB) DS  
4GB(2 x 2GB) DS  
-
-
-
9-9-9-24 1.5V  
7-7-7-24 1.5V  
-
2GB  
SS Hynix  
DS Hynix  
DS Hynix  
H5TQ2G83BFRH9C  
-
-
1.35V(low  
voltage)  
Hynix  
HMT125U6TFR8A-H9  
2GB  
H5TC1G83TFRH9A  
-
Hynix  
HMT351U6BFR8C-H9  
FLFE85F-C8KF9 CAES  
FLFE85F-C8KL9 NAES  
FLFE85F-C8KM9 NAES  
FLFE85F-B8KL9 NEES  
FLFF65F-C8KL9 NEES  
FLFF65F-C8KM9 NEES  
4GB  
2GB  
2GB  
2GB  
2GB  
4GB  
4GB  
H5TQ2G83BFRH9C  
-
-
-
-
-
-
-
9
-
-
KINGMAX  
KINGMAX  
KINGMAX  
KINGMAX  
KINGMAX  
KINGMAX  
SS KINGMAX KFC8FMFXF-DXX-15A  
SS KINGMAX KFC8FNLXF-DXX-15A  
SS KINGMAX KFC8FNMXF-BXX-15A  
DS KINGMAX KKB8FNWBFGNX-26A  
DS KINGMAX KFC8FNLXF-DXX-15A  
DS KINGMAX KFC8FNMXF-BXX-15A  
-
-
-
-
-
-
KINGSTON KVR1333D3N9/2G(low profile) 2GB  
SS Hynix  
SS Micron  
H5TQ2G83AFRH9C  
IID77 D9LGK  
-
KINGSTON KVR1333D3S8N9/2G  
KVR1333D3S8N9/2G-SP(low  
profile)  
2GB  
1.5V  
KINGSTON  
2GB  
SS ELPIDA  
J2108BCSE-DJ-F  
-
1.5V  
KINGSTON KVR1333D3N9/2G(low profile) 2GB  
DS ELPIDA  
DS KTC  
J1108BFBG-DJ-F  
D1288JPNDPLD9U  
J1108BDSE-DJ-F  
9
9
9
1.5V  
1.5V  
1.5V  
KINGSTON KVR1333D3N9/2G  
KINGSTON KVR1333D3N9/2G  
2GB  
2GB  
DS ELPIDA  
KVR1333D3N9/2G-SP(low  
profile)  
KINGSTON  
KINGSTON  
2GB  
2GB  
DS KTC  
D1288JEMFNGD9U  
-
-
1.5V  
1.5V  
KVR1333D3N9/2G-SP(low  
profile)  
DS KINGSTON D1288JPSFPGD9U  
KINGSTON KHX1333C7D3K2/4GX(XMP)  
4GB(2 x 2GB) DS  
-
-
-
7
9
9
-
1.65V  
XMP 1.25V  
1.5V  
KINGSTON KHX1333C9D3UK2/4GX(XMP) 4GB(2 x 2GB) DS  
-
KINGSTON KVR1333D3N9/4G(low profile) 4GB  
DS ELPIDA  
DS ELPIDA  
DS KTC  
J2108BCSE-DJ-F  
J2108BCSE-DJ-F  
D2568JENCNGD9U  
H5TQ2G83AFR  
KINGSTON KVR1333D3N9/4G(low profile) 4GB  
1.5V  
KINGSTON KVR1333D3N9/4G  
KINGSTON KVR1333D3N9/4G  
4GB  
4GB  
-
1.5V  
DS Hynix  
-
-
KVR1333D3N9/4G-SP(low  
profile)  
KINGSTON  
4GB  
DS KINGSTON D2568JENCPGD9U  
-
1.5V  
Micron  
MT8JTF25664AZ-1G4D1  
MT8JTF25664AZ-1G4M1  
MT16JTF25664AZ-1G4F1  
MT16JTF51264AZ-1G4D1  
NT4GC64B8HG0NF-CG  
AL8F8G73F-DJ2  
2GB  
2GB  
2GB  
4GB  
4GB  
2GB  
2GB  
2GB  
4GB  
2GB  
4GB  
SS Micron  
SS MICRON  
DS Micron  
DS Micron  
DS NANYA  
DS PSC  
OJD12D9LGK  
IJM22 D9PFJ  
-
-
-
-
-
-
-
-
-
-
-
-
Micron  
-
Micron  
9KF27D9KPT  
9
-
Micron  
OLD22D9LGK  
NT5CB256M8GN-CG  
A3P1GF3FGF  
NANYA  
PSC  
-
-
SAMSUNG  
SAMSUNG  
SAMSUNG  
M378B5773DH0-CH9  
M378B5673FH0-CH9  
M378B5273CH0-CH9  
SS SAMSUNG K4B2G0846D  
DS SAMSUNG K4B1G0846F  
DS SAMSUNG K4B2G0846C  
DS SAMSUNG K4B1G0846F  
DS SAMSUNG K4B2G0846C  
-
-
-
Super Talent W1333UB2GS  
Super Talent W1333UB4GS  
Super Talent W1333UX6GM  
9
-
6GB(3x 2GB) DS Micron  
2GB SS MICRON  
0BF27D9KPT  
PE911-125E  
9-9-9-24 1.5V  
KINGSTEK  
KSTD3PC-10600  
-
-
1-15  
ASUS F2A55-M LK Series  
DDR3 1066 MHz capability  
DIMM socket support  
(Optional)  
Vendors  
Part No.  
Size SS/DS Chip Brand Chip NO.  
Timing Voltage  
1 DIMM  
2 DIMMs  
Crucial  
CT12864BA1067.8FF  
EBJ21UE8EDF0-AE-F  
1GB SS  
2GB DS  
Micron  
9GF22D9KPT  
7
-
-
1.35V(low  
voltage)  
ELPIDA  
ELPIDA  
J1108EDSE-DJ-F  
KINGSTON KVR1066D3N7/1G(low profile) 1GB SS  
KINGSTON KVR1066D3N7/4G 4GB DS  
ELPIDA  
Hynix  
J1108BFSE-DJ-F  
H5TQ2G83AFR  
7
7
1.5V  
1.5V  
Side(s): SS - Single-sided DS - Double-sided  
DIMM support:  
1 DIMM: Supports one module inserted into any slot as Single-channel memory  
configuration.  
2 DIMMs: Supports two modules inserted into both the blue slots as one pair of Dual-  
channel memory configuration.  
1-16  
Chapter 1: Product introduction  
1.5.3  
1
Installing a DIMM  
2
3
To remove a DIMM  
B
A
A
1-17  
ASUS F2A55-M LK Series  
 
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 slot supports cards such as a LAN card, SCSI card, USB card, and other cards that  
comply with PCI specifications.  
1.6.4  
PCI Express x1 slot  
This motherboard supports PCI Express x1 network cards, SCSI cards, and other cards that  
comply with the PCI Express specifications.  
1.6.5  
PCI Express x16 slot  
This motherboard supports one PCI Express x16 graphics card that complies with the PCI  
Express specifications.  
1-18  
Chapter 1: Product introduction  
 
IRQ assignments for this motherboard  
A
B
C
D
E
F
G
H
PCIEx16_1  
shared  
PCIEx1_1  
shared  
PCIEx1_2  
shared  
PCI1 slot  
shared  
OnChip IGP  
Realtek LAN controller  
shared  
shared  
HD audio  
shared  
shared  
SATA controller  
Onboard USB2.0 controller  
shared  
1-19  
ASUS F2A55-M LK Series  
1.7  
Jumpers  
1.  
Clear RTC RAM (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.  
CLRTC  
F2A55-M LK PLUS  
1
2
2
3
Normal  
Clear RTC  
(Default)  
F2A55-M LK PLUS 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  
reenter data.  
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 so the BIOS can automatically reset parameter  
settings to default values.  
1-20  
Chapter 1: Product introduction  
 
2.  
Keyboard power (3-pin KBPWR)  
This jumper allows you to enable or disable the keyboard 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 keyboard. This feature requires an ATX power supply that can supply at least 1A  
on the +5VSB lead, and a corresponding setting in the BIOS.  
KBPWR  
F2A55-M LK PLUS  
+5VSB  
+5V  
(Default)  
F2A55-M LK PLUS Keyboard power setting  
3.  
USB device wake-up (3-pin USBPW1-4, 3-pin USBPW5-10)  
Set these jumpers 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).  
USBPW1-4  
+5VSB  
+5V  
(Default)  
USBPW5-10  
F2A55-M LK PLUS  
1
2
2
3
+5VSB  
+5V  
(Default)  
F2A55-M LK PLUS 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.  
1-21  
ASUS F2A55-M LK Series  
1.8  
Connectors  
1.8.1  
Rear panel ports  
1
2
3 4  
10  
9
8
7
6
5
1.  
2.  
PS/2 Mouse port (green). This port is for a PS/2 mouse.  
LAN (RJ-45) port. This port allows Gigabit connection to a Local Area Network (LAN)  
through a network hub.  
LAN port LED indications  
ACT/LINK SPEED  
LED  
LED  
Activity/Link LED  
Speed LED  
Status  
Description  
Status  
Description  
OFF  
No link  
OFF  
10Mbps connection  
100Mbps connection  
1Gbps connection  
ORANGE  
BLINKING  
Linked  
ORANGE  
GREEN  
Data activity  
LAN port  
3.  
4.  
5.  
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 below for the function of the audio ports in 2, 4, 6, or  
8-channel configuration.  
Audio 2, 4, 6, or 8-channel configuration  
Headset  
2-channel  
Port  
4-channel  
6-channel  
8-channel  
Light Blue (Rear panel)  
Lime (Rear panel)  
Line In  
Rear Speaker Out Rear Speaker Out Rear Speaker Out  
Line Out Front Speaker Out Front Speaker Out Front Speaker Out  
Pink (Rear panel)  
Lime (Front panel)  
Mic In  
Mic In  
Bass/Center  
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.  
1-22  
Chapter 1: Product introduction  
 
6.  
7.  
8.  
9.  
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 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports are for USB  
2.0/1.1 devices.  
Video Graphics Adapter (VGA) port. This 15-pin port is for a VGA monitor or other  
VGA-compatible devices.  
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 isn’t compatible with DVI-I.  
10. PS/2 Keyboard port (purple). This port is for a PS/2 keyboard.  
1.8.2  
Internal connectors  
1.  
CPU and chassis fan connectors (4-pin CPU_FAN, and 3-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  
F2A55-M LK PLUS  
F2A55-M LK PLUS 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 CPU_FAN connector support the ASUS Fan Xpert feature.  
1-23  
ASUS F2A55-M LK Series  
 
2.  
ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)  
These connectors are for an ATX power supply. The plugs from the power supply 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  
F2A55-M LK PLUS  
+5 Volts  
GND  
PSON#  
GND  
+3 Volts  
+3 Volts  
-12 Volts  
+3 Volts  
PIN 1  
F2A55-M LK PLUS 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.  
If you intend to use a PSU with 20-pin and 4-pin power plugs, ensure that the 20-pin  
power plug can provide at least 15 A on +12 V and that the PSU has a minimum  
power rating of 300W. The system may become unstable or may not boot up if the  
power is inadequate.  
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.  
1-24  
Chapter 1: Product introduction  
3.  
Serial ATA 3.0 Gb/s connectors (7-pin SATA3G 1~6)  
These connectors are for the Serial ATA 3.0 Gb/s signal cables for Serial ATA hard  
disk drives and optical disc drives. If you installed Serial ATA hard disk drives, you can  
create a RAID 0, RAID 1, or RAID 10 configuration through the onboard controller.  
GND  
RSATA_RXP6  
RSATA_RXN6  
GND  
RSATA_TXN6  
RSATA_TXP6  
GND  
SATA3G_4  
SATA3G_3  
SATA3G_2  
SATA3G_1  
SATA3G_6  
GND  
RSATA_RXP5  
RSATA_RXN5  
GND  
RSATA_TXN5  
RSATA_TXP5  
GND  
SATA3G_5  
F2A55-M LK PLUS  
F2A55-M LK PLUS SATA 3.0Gb/s connectors  
These connectors are set to AHCI mode by default. If you intend to create a Serial ATA  
RAID set using these connectors, set the type of the SATA connectors in the BIOS to  
[RAID]. See section 2.5.2 SATA Configuration for details.  
You must install Windows® XP Service Pack 3 or later version before using Serial  
ATA hard disk drives. The Serial ATA RAID feature is available only if you are using  
Windows® XP SP3 or later version.  
When using hot-plug and NCQ, set the type of the SATA connectors in the BIOS to  
[AHCI]. See section 2.5.2 SATA Configuration for details.  
4.  
LPT connector (26-1 pin LPT)  
The LPT (Line Printing Terminal) connector supports devices such as a printer. LPT  
standardizes as IEEE 1284, which is the parallel port interface on IBM PC-compatible  
computers.  
LPT  
F2A55-M LK PLUS  
F2A55-M LK PLUS LPT connector  
1-25  
ASUS F2A55-M LK Series  
5.  
System panel connector (10-1 pin PANEL)  
This connector supports several chassis-mounted functions.  
F_PANEL  
PLED PWRBTN  
PIN 1  
F2A55-M LK PLUS  
+HDLED RESET  
F2A55-M LK PLUS 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 +IDELED)  
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 PWRBTN)  
This 2-pin 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.  
6.  
Speaker connector (4-pin SPEAKER)  
The 4-pin connector is for the chassis-mounted system warning speaker. The speaker  
allows you to hear system beeps and warnings.  
SPEAKER  
F2A55-M LK PLUS  
PIN 1  
F2A55-M LK PLUS Speaker out connector  
1-26  
Chapter 1: Product introduction  
7.  
Digital audio connector (4-1 pin SPDIF_OUT)  
This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port.  
F2A55-M LK PLUS  
SPDIF_OUT  
F2A55-M LK PLUS Digital audio connector  
The S/PDIF module is purchased separately.  
8.  
Front panel audio connector (10-1 pin AAFP)  
This connector is for a chassis-mounted front panel audio I/O module that supports  
either High Definition Audio or AC`97 audio standard. Connect one end of the front  
panel audio I/O module cable to this connector.  
AAFP  
PIN 1  
F2A55-M LK PLUS  
HD-audio-compliant  
pin definition  
Legacy AC’97  
compliant definition  
F2A55-M LK PLUS Front panel audio connector  
We recommend that you connect a high-definition front panel audio module to this  
connector to avail of the motherboard 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 to [HD]. See section 2.5.5 Onboard Devices  
Configuration for details.  
The front panel audio I/O module is purchased separately.  
1-27  
ASUS F2A55-M LK Series  
9.  
USB 2.0 connectors (10-1 pin USB56, USB78, USB910)  
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 specification that supports up to  
480Mbps connection speed.  
USB910  
USB78  
USB56  
F2A55-M LK PLUS  
PIN 1  
PIN 1  
PIN 1  
F2A55-M LK PLUS 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.  
10. Serial port connector (10-1 pin COM)  
This connector is for a serial (COM) port. Connect the serial port module cable to this  
connector, then install the module to a slot opening at the back of the system chassis.  
COM  
PIN 1  
F2A55-M LK PLUS  
F2A55-M LK PLUS Serial port (COM) connector  
The COM module is purchased separately.  
1-28  
Chapter 1: Product introduction  
1.9  
Software support  
1.9.1  
Installing an operating system  
This motherboard supports Windows® XP / Vista / Windows® 7 / Windows® 8 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.  
BIOS and drivers updates are required to support Windows® 8.  
1.9.2  
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  
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. 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 on 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.  
1-29  
ASUS F2A55-M LK Series  
 
1-30  
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 Specials 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:  
Chapter 2: BIOS information  
2-1  
 
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 2 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 with FAT 32/16 format and single partition only.  
DO NOT shut down or reset the system while updating the BIOS to prevent system  
boot failure!  
2-2  
ASUS F2A55-M LK Series  
 
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  
F2A55MLK.CAP (for F2A55-M LK) or F2A55MKP.CAP (for F2A55-M LK PLUS).  
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 setting. 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!  
Chapter 2: BIOS information  
2-3  
 
2.1.4  
ASUS BIOS Updater  
The ASUS BIOS Updater allows you to update BIOS in 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 in FAT32/16 format and  
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 in 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.  
Please select boot device:  
SATA: XXXXXXXXXXXXXXXX  
USB XXXXXXXXXXXXXXXXX  
UEFI: XXXXXXXXXXXXXXXX  
Enter Setup  
and to move selection  
ENTER to select boot device  
ESC to boot using defaults  
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).  
Welcome to FreeDOS (http://www.freedos.org)!  
C:\>d:  
D:\>  
2-4  
ASUS F2A55-M LK Series  
 
Updating the BIOS file  
To update the BIOS file using BIOS Updater  
1.  
At the FreeDOS prompt, type bupdater /pc /gand press <Enter>.  
D:\>bupdater /pc /g  
2.  
The BIOS Updater screen appears as below.  
ASUSTek BIOS Updater for DOS V1.30  
Current ROM  
BOARD: F2A55-M LK PLUS  
VER: 0301  
Update ROM  
BOARD: Unknown  
VER: Unknown  
DATE: 07/13/2012  
DATE: Unknown  
PATH: A:\  
A:  
F2A55MKP.CAP  
8390656 2012-07-13 17:30:48  
Note  
[Enter] Select or Load  
[Tab] Switch  
[B] Backup  
[V] Drive Info  
[Esc] Exit  
[Up/Down/Home/End] Move  
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.  
Are you sure to update BIOS?  
Yes  
No  
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 1.30 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.  
Chapter 2: BIOS information  
2-5  
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 to  
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.  
Ensure that a USB mouse is connected to your motherboard if you want to use the  
mouse to control the BIOS setup program.  
The default BIOS settings for this motherboard apply for most conditions to ensure  
optimum performance. If the system becomes unstable after changing any BIOS  
settings, 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.  
If the system fails to boot after changing any BIOS setting, try to clear the CMOS and  
reset the motherboard to the default value. Refer to section 1.7 Jumpers on how to  
erase the RTC RAM.  
The BIOS setup program does not support the bluetooth devices.  
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.  
2-6  
ASUS F2A55-M LK Series  
 
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 or press F7 hot  
key for the advanced BIOS settings.  
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.  
Selects the display language of  
the BIOS setup program  
Displays the CPU/motherboard temperature,  
Exits the BIOS setup program without saving  
CPU/5V/3.3V/12V voltage output,  
CPU/chassis fan speed  
the changes, saves the changes and resets  
the system, or enters the Advanced Mode  
Exit/Advanced Mode  
UEFI BIOS Utility - EZ Mode  
F2A55-M LK PLUS  
English  
BIOS Version : 0301  
CPU Type : AMD A8-5600K APU with Radeon(tm) HD Graphics  
Total Memory : 1024 MB (DDR3 1333MHz)  
Speed : 3300 MHz  
Friday [10/08/2010]  
Temperature  
Voltage  
Fan Speed  
CPU_FAN 3325RPM CHA_FAN  
CPU  
MB  
+113.0ºF/+45.0ºC  
+75.2ºF/+40.0ºC  
CPU  
3.3V  
1.248V  
3.344V  
5V  
5.160V  
N/A  
12V  
12.248V  
System Performance  
Quiet  
Performance  
Boot Priority  
Energy Saving  
Normal  
Use the mouse to drag or keyboard to navigate to decide the boot priority.  
Shortcut (F3) Advanced Mode(F7)  
Boot Menu(F8)  
Default(F5)  
Power Saving mode  
Loads optimized default  
ASUS Optimal mode  
Selects the Advanced  
mode functions  
Normal mode  
Selects the boot device priority  
Selects the boot  
device priority  
Displays the system properties of the  
selected mode on the right hand side  
Displays the Advanced mode menus  
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.  
Chapter 2: BIOS information  
2-7  
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  
Scroll bar  
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  
Monitor  
Boot  
For displaying the system temperature, power status, and changing the fan settings  
For changing the system boot configuration  
Tool  
For configuring options for special functions  
Exit  
For selecting the exit options and loading default settings  
2-8  
ASUS F2A55-M LK Series  
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> or double-click the  
item.  
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> or click on it to display a list of options.  
Chapter 2: BIOS information  
2-9  
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] [Français] [Español] [Deutsch] [Русский]  
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.  
2-10  
ASUS F2A55-M LK Series  
 
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.  
Chapter 2: BIOS information  
2-11  
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.  
Exit  
EFI BIOS Utility - Advanced Mode  
Main  
Ai Tweaker  
Advanced  
Monitor  
Boot  
Tool  
Target CPU Speed: 3600MHz  
Select the target CPU frequency, and the  
relevant parameters will be auto-adjusted.  
Target DRAM Speed: 1333MHz  
Ai Overclock Tuner  
Auto  
Auto  
Memory Frequency  
APU Multiplier  
Auto  
Auto  
NB Frequency  
EPU Power Saving Mode  
GPU Boost  
Disabled  
Auto  
>
>
OC Tuner  
→←: Select Screen  
↑↓: Select Item  
Enter: Select  
DRAM Timing Control  
CPU Voltage  
Offset Mode  
+
+/-: Change Opt.  
F1: General Help  
F2: Previous Values  
F5: Optimized Defaults  
F10: Save ESC: Exit  
F12: Print Screen  
CPU Offset Mode Sign  
CPU Offset Voltage  
VDDNB Offset Mode Sign  
VDDNB Offset Voltage  
1.362V  
Auto  
+
1.187V  
Auto  
Version 2.10.1208. Copyright (C) 2012 American Megatrends, Inc.  
Scroll down to display the following items:  
DRAM Voltage  
SB 1.1V Voltage  
1.1VSB Voltage  
APU1.2V Voltage  
VDDA Voltage  
1.500V  
1.100V  
1.100V  
1.200V  
2.500V  
Auto  
Auto  
Auto  
Auto  
Auto  
Digi + VRM  
CPU Load Line Calibration  
Auto  
CPU/NB Load Line Calibration  
CPU Current Capability  
Auto  
→←: Select Screen  
↑↓: Select Item  
Enter: Select  
100%  
100%  
+/-: Change Opt.  
F1: General Help  
F2: Previous Values  
F5: Optimized Defaults  
F10: Save ESC: Exit  
F12: Print Screen  
CPU/NB Current Capability  
CPU Power Phase Control  
CPU Voltage Frequency  
CPU Power Duty Control  
Standard  
Auto  
T.Probe  
Version 2.10.1208. Copyright (C) 2012 American Megatrends, Inc.  
2-12  
ASUS F2A55-M LK Series  
 
Target CPU Speed : xxxxMHz  
Displays the current CPU speed.  
Target DRAM Speed : xxxxMHz  
Displays the current DRAM speed.  
2.4.1  
Ai Overclock Tuner [Auto]  
Allows you to select the CPU overclocking options to achieve the desired CPU internal  
frequency. Select any of these preset overclocking configuration options:  
[Auto]  
Loads the optimal settings for the system.  
[Manual]  
Allows you to individually set overclocking parameters.  
APU Frequency [XXX]  
This item appears only when you set the Ai Overclock Tuner item to [Manual]. Use the <+>  
and <-> keys to adjust the value. You can also key in the desired value using the numeric  
keypad. The values range from 90.0MHz to 300.0MHz.  
2.4.2  
Memory Frequency [Auto]  
Allows you to set the memory operating frequency. Configuration options: [Auto] [DDR3-  
800MHz] [DDR3-1066MHz] [DDR3-1333MHz] [DDR3-1600MHz] [DDR3-1866MHz] [DDR3-  
2133MHz] [DDR3-2400MHz]  
Selecting a very high memory frequency may cause the system to become unstable! If this  
happens, revert to the default setting.  
2.4.3  
APU Multiplier [Auto]  
Allows you to set the multiplier between the CPU Core Clock and the FSB Frequency. Use  
the <+> and <-> keys to adjust the ratio. The valid value ranges vary according to your CPU  
model.  
2.4.4  
NB Frequency [Auto]  
Allows you to adjust the NB frequency. Use the <+> and <-> keys to adjust the value. You  
can also key in the desired value using the numeric keypad.  
2.4.5  
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 The EPU Power Saving Mode is set to [Enabled] and  
allows you to set power saving mode. Configuration options: [Auto] [Light Power  
Saving Mode] [Medium Power Saving Mode] [Max Power Saving Mode]  
Chapter 2: BIOS information  
2-13  
 
2.4.6  
GPU Boost [Auto]  
[Auto]  
Automatic configuration.  
[Turbo Mode]  
Set to [Trubo Mode] to achieve better 3D performance.  
[Extreme Mode] Set to [Extreme Mode] for the excellent visual experience.  
[Manual Mode] Set to [Manual Mode] if you want to manually select the desired GPU  
Engine frequency.  
The following item appears only when you set the GPU Boost item to [Manual Mode].  
GPU Engine Frequency [Auto]  
Allows you to set the GPU Engine Frequency. Configuration options: [Auto] [GPU O.C.  
434MHz] [GPU O.C. 447MHz] [GPU O.C. 460MHz] [GPU O.C. 475MHz] ~ [GPU O.C.  
1381MHz] [GPU O.C. 1520MHz] [GPU O.C. 1688MHz] [GPU O.C. 1900MHz]  
2.4.7  
OC Tuner  
OC Tuner automatically overclocks the frequency and voltage of CPU and DRAM for  
enhancing the system performance. Press <Enter> and select OK to start automatic  
overclocking.  
2.4.8  
DRAM Timing Control  
The sub-items 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 <Enter>.  
Changing the values in this menu may cause the system to become unstable! If this  
happens, revert to the default settings.  
2.4.9  
CPU Voltage [Offset Mode]  
[Offset Mode]  
To offset the voltage by a positive or negative value.  
CPU Offset Mode Sign [+]  
[+]  
[–]  
To offset the voltage by a positive value.  
To offset the voltage by a negative value.  
CPU Offset Voltage [Auto]  
Allows you to set the CPU Offset voltage. The values range from 0.00625V to 0.500V  
with a 0.00625V interval.  
Refer to the CPU documentation before setting the CPU voltage. Setting a high voltage  
may damage the CPU permanently, and setting a low voltage may make the system  
unstable.  
VDDNB Offset Mode Sign [+]  
[+]  
[–]  
To offset the voltage by a positive value.  
To offset the voltage by a negative value.  
2-14  
ASUS F2A55-M LK Series  
 
VDDNB Offset Voltage [Auto]  
Allows you to set the VDDNB Offset voltage. The values range from 0.00625V to  
0.500V with a 0.00625V interval.  
2.4.10  
DRAM Voltage [Auto]  
Allows you to set the DRAM voltage. The values range from 1.35V to 2.00V with a 0.005V  
interval.  
2.4.11  
SB 1.1V Voltage [Auto]  
Allows you to set the Southbridge 1.1V voltage. The values range from 1.1V to 1.4V with a  
0.01V interval.  
2.4.12  
1.1VSB Voltage [Auto]  
Allows you to set the 1.1VSB voltage. The values range from 1.1000V to 1.4000V with a 0.1V  
interval.  
2.4.13  
APU1.2V Voltage [Auto]  
Allows you to set the APU (Accelerated Processor Unit) 1.2V voltage. The values range from  
1.2000V to 1.8000V with a 0.01V interval.  
2.4.14  
VDDA Voltage [Auto]  
Allows you to set the VDDA voltage. The values range from 2.5000V to 2.8000V with a 0.1V  
interval.  
The values of the CPU Offset Voltage, VDDNB Offset Voltage, DRAM Voltage,  
SB 1.1V Voltage, 1.1Vsb Voltage, APU1.2V Voltage, and VDDA Voltage items are  
labeled in different color, indicating the risk levels of high voltage settings.  
The system may need better cooling system to work stably under high voltage  
settings.  
2.4.15  
DIGI+ VRM  
CPU Load Line Calibration [Auto]  
Load-line Calibration is defined by AMD VRM specifications and affects CPU voltage. The  
CPU working voltage will decrease proportionally to CPU 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), 60% (Medium), 80% (High), and 100%  
(Extreme). Configuration options: [Auto] [Regular] [Medium] [High] [Extreme]  
The actual performance boost may vary depending on your CPU specifiation.  
CPU/NB Load Line Calibration [Auto]  
Allows you to select the CPU/NB Load-Line Calibration mode. Configuration options: [Auto]  
[Regular] [High] [Extreme]  
Chapter 2: BIOS information  
2-15  
 
CPU Current Capability [100%]  
This item provides wider total power range for overclocking. A higher value brings a  
wider total power range and extends the overclocking frequency range simultaneously.  
Configuration options: [100%] [110%] [120%] [130%]  
CPU/NB Current Capability [100%]  
This item provides wider total power range for overclocking. A higher value brings a  
wider total power range and extends the overclocking frequency range simultaneously.  
Configuration options: [100%] [110%] [120%] [130%]  
CPU Power Phase Control [Standard]  
Phase number is the number of working VRM phase. Increasing phase number under heavy  
system loading to get more transient and better thermal performance. Reducing phase  
number under light system loading to increase VRM efficiency.  
[Standard]  
Proceeds phase control depending on the CPU loading.  
Loads the ASUS optimized phase tuning profile.  
Proceeds the full phase mode.  
[Optimized]  
[Extreme]  
[Manual Adjustment]  
Allows manual adjustment.  
Manual Adjustment [Fast]  
Select [Ultra Fast] for a faster response. The reaction time will be longer when [Regular] is  
selected. Configuration options: [Ultra Fast] [Fast] [Medium] [Regular]  
CPU Voltage Frequency [Auto]  
Switching frequency will affect the VRM transient response and component thermal. Setting  
a higher frequency gets faster transient response. Use the <+> and <-> keys to adjust the  
value. The values range from 200k Hz to 350k Hz with a 50k Hz interval.  
CPU Power Duty Control [T.Probe]  
[T.Probe]  
[Extreme]  
Maintains the VRM thermal balance.  
Maintains the VRM current balance.  
Do not remove the thermal module while changing the DIGI+VRM related parameters. The  
thermal conditions should be monitored.  
2-16  
ASUS F2A55-M LK Series  
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.  
Exit  
EFI BIOS Utility - Advanced Mode  
Main  
Ai Tweaker  
Advanced  
Monitor  
Boot  
Tool  
CPU Configuration Parameters  
>
>
>
>
>
>
>
CPU Configuration  
SATA Configuration  
USB Configuration  
NB Configuration  
Onboard Devices Configuration  
APM  
Network Stack  
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.  
AMD PowerNow function [Enabled]  
Enables or disables the AMD PowerNow function. Configuration options: [Enabled] [Disabled]  
NX Mode [Enabled]  
Enables or disables the No-execute page protection function. Configuration options:  
[Enabled] [Disabled]  
SVM [Enabled]  
Enables or disables CPU virtualization. Configuration options: [Disabled] [Enabled]  
CPB Mode [Auto]  
Disables the CPB (Core Performance Boost) mode or set it to [Auto] for automatic  
configuration. Configuration options: [Disabled] [Auto]  
C6 Mode [Disabled]  
Enables or disables C6 mode. Configuration options: [Enabled] [Disabled]  
IOMMU [Disabled]  
Set this item to [Enabled] to show IOMMU Mode. Configuration options: [Enabled] [Disabled]  
Chapter 2: BIOS information  
2-17  
 
2.5.2  
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.  
OnChip SATA Channel [Enabled]  
Enables or disables onboard channel SATA port. Configuration options: [Disabled] [Enabled]  
OnChip SATA Type [AHCI]  
Allows you to set the SATA configuration.  
[IDE]  
Set to [IDE] when you want to use the Serial ATA hard disk drives as  
Parallel ATA physical storage devices.  
[RAID]  
[AHCI]  
Set to [RAID] when you want to create a RAID configuration from the SATA  
hard disk drives.  
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.  
SATA Port 5 - Port 6 [AHCI]  
This item only appears when OnChip SATA Type is set to [AHCI]. If SATA port 5  
and port 6 are configured as [AHCI], the ports can only be used under OS with driver  
installed. Set to [IDE] instead of [AHCI] to access devices on SATA port 5 and port 6  
before entering OS. Configuration options: [AHCI] [IDE]  
SATA Port 5 - Port 6 [RAID]  
This item only appears when OnChip SATA Type is set to [RAID]. If SATA port 5  
and port 6 are configured as [RAID], the ports can only be used under OS with driver  
installed. Set to [IDE] instead of [RAID] to access devices on SATA port 5 and port 6  
before entering OS. Configuration options: [RAID] [IDE]  
Board SATA RAID ROM [Legacy ROM]  
This item only appears when OnChip SATA Type is set to [RAID].  
[Disabled]  
Disables this function.  
[Legacy ROM] Select this option when using legacy operating systems.  
[UEFI DRIVER] Select this option when using UEFI operating systems.  
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]  
2-18  
ASUS F2A55-M LK Series  
 
2.5.3  
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.  
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.  
EHCI Hand-off [Disabled]  
[Enabled]  
Enables the support for operating systems without an EHCI hand-off  
feature.  
[Disabled]  
Disables the function.  
2.5.4  
NB Configuration  
IGFX Multi-Monitor [Disabled]  
Enables or disables the Internal Graphics Device Multi-Monitor support for add-on VGA  
devices. And the memory size of Internal Graphics Device will keep memory reserved.  
Configuration options: [Disabled] [Enabled]  
Primary Video Device [PCIE / PCI Video]  
Selects the primary display device. Configuration options: [IGFX Video] [PCIE / PCI Video]  
Integrated Graphics [Auto]  
Enables the integrated graphics controller. Configuration options: [Auto] [Force]  
UMA Frame Buffer Size [Auto]  
This item appears only when you set the previous item to [Force]. Configuration options:  
[Auto] [32M] [64M] [128M] [256M]  
2.5.5  
Onboard Devices Configuration  
HD Audio Device [Enabled]  
[Enabled]  
Enables the High Definition Audio Controller.  
[Disabled]  
Disables the controller.  
The following two items appear only when you set the HD Audio Device item to [Enabled].  
Chapter 2: BIOS information  
2-19  
 
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.  
SPDIF Out Type [SPDIF]  
[SPDIF]  
[HDMI]  
Sets to [SPDIF] for SPDIF audio output.  
Sets to [HDMI] for HDMI audio output.  
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 Realtek LAN Controller item to [Enabled] and  
allows you to enable or disable the Rom Help of the Realtek LAN controller. Configuration  
options: [Enabled] [Disabled]  
Serial Port Configuration  
The sub-items in this menu allow you to set the serial port configuration.  
Serial Port [Enabled]  
Allows you to enable or disable the serial port (COM). Configuration options: [Enabled]  
[Disabled]  
Change Settings [Auto]  
Allows you to select the Serial Port base address. Configuration options: [Auto]  
[IO=3F8h; IRQ=4] [IO=2F8h; IRQ=3] [IO=3E8h; IRQ=4] [IO=2E8h; IRQ=3]  
Parallel Port Configuration [Enabled]  
The sub-items in this menu allow you to set the parallel port configuration.  
Parallel Port [Enabled]  
Allows you to enable or disable the parallel port (LPT/LPTE).  
Configuration options: [Enabled] [Disabled]  
Change Settings [Auto]  
Allows you to select the Parallel Port base address.  
Configuration options: [IO=378h; IRQ=5] [IO=378h; IRQ=5,6,7,9,10,11,12]  
[IO=278h; IRQ=5,6,7,9,10,11,12] [IO=3BCh; IRQ=5,6,7,9,10,11,12]  
Device Mode [Auto]  
Allows you to set the Printer port mode. Configuration options: [STD Printer Mode]  
[SPP Mode] [EPP-1.9 and SPP Mode] [EPP-1.7 and SPP Mode] [ECP Mode] [ECP  
and EPP-1.9 Mode] [ECP and EPP-1.7 Mode]  
2-20  
ASUS F2A55-M LK Series  
2.5.6  
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.  
Power On By PS/2 Keyboard [Disabled]  
[Disabled]  
[Space Bar]  
[Ctrl-Esc]  
Disables the Power On by a PS/2 keyboard.  
Sets the Space Bar on the PS/2 keyboard to turn on the system.  
Sets the Ctrl+Esc key on the PS/2 keyboard to turn on the system.  
[Power Key]  
Sets Power key on the PS/2 keyboard to turn on the system. This feature  
requires an ATX power supply that provides at least 1A on the +5VSB lead.  
Power On By PS/2 Mouse [Disabled]  
[Disabled]  
[Enabled]  
Disables the Power On by a PS/2 mouse.  
Enables the Power On by a PS/2 mouse. This feature requires an ATX  
power supply that provides at least 1A on the +5VSB lead.  
Power On By PME [Disabled]  
[Disabled]  
[Enabled]  
Disables the PME to wake up by PCI/PCIE devices.  
Allows you to turn on the system through a PCI/PCIE LAN or modem card.  
This feature requires an ATX power supply that provides at least 1A on the  
+5VSB lead.  
Power On By Ring [Disabled]  
[Disabled]  
[Enabled]  
Disables Ring to generate a wake event.  
Enables Ring to generate a wake event.  
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.  
RTC Alarm Date (Days)  
This item appears only when you set the previous item to [Enabled] and allows you to select  
RTC alarm time (days). When you set the time to zero, the RTC alarms everyday. Use <+>  
and <-> keys to adjust the time.  
- Hour / - Mimute / - Second  
Allows you to set the RTC alarm time. Use <+> and <-> keys to adjust the time.  
Chapter 2: BIOS information  
2-21  
 
2.5.7  
Network Stack  
Network Stack [Disable Link]  
This item allows user to disable or enable the UEFI network stack. Configuration options:  
[Disable Link] [Enabled]  
Ipv4 PXE Support [Enabled]  
This item appears only when you set the Network Stack item to [Enabled]. When this item is  
disabled, the IPV4 PXE boot option will not be created. Configuration options: [Disable Link]  
[Enabled]  
Ipv6 PXE Support [Enabled]  
This item appears only when you set the Network Stack item to [Enabled]. When this item is  
disabled, the IPV6 PXE boot option will not be created. Configuration options: [Disable Link]  
[Enabled]  
2-22  
ASUS F2A55-M LK Series  
 
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 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]  
[200RPM] [300 RPM] [400 RPM] [500 RPM] [600 RPM]  
Chapter 2: BIOS information  
2-23  
 
CPU 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]  
Sets to [Silent] to minimize the fan speed for quiet CPU fan operation.  
[Turbo]  
Sets to [Turbo] to achieve maximum CPU fan speed.  
[Manual] Sets to [Manual] to assign detailed fan speed control parameters.  
The following four items appear only when you set CPU Profile to [Manual].  
CPU_FAN Upper Temperature [70ºC]  
Use the <+> and <-> keys to adjust the upper limit of the CPU temperature. The values range  
from 20ºC to 90ºC.  
CPU_FAN Fan Max. Duty Cycle(%) [100%]  
Use the <+> and <-> keys to adjust the maximum CPU fan duty cycle. The values range from  
40% to 100%. When the CPU temperature reaches the upper limit, the CPU fan will operate at  
the maximum duty cycle.  
CPU_FAN Lower Temperature [20ºC]  
Displays the lower limit of the CPU temperature.  
CPU_FAN Fan Min. Duty Cycle(%) [40%]  
Use the <+> and <-> keys to adjust the minimum CPU fan duty cycle. The values range from  
40% to 100%. When the CPU temperature is under the lower limit, the CPU fan will operate at  
the minimum duty cycle.  
2.6.4  
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.  
2.6.5  
Anti Surge Support [Enabled]  
This item allows you to enable or disable the Anti Surge function. Configuration options:  
[Disabled] [Enabled]  
2-24  
ASUS F2A55-M LK Series  
 
2.7  
Boot menu  
The Boot menu items allow you to change the system boot options.  
Scroll down to display the following items:  
2.7.1  
[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].  
2.7.2  
[Enabled]  
Full Screen Logo [Enabled]  
Enables the full screen logo display feature.  
Disables the full screen logo display feature.  
[Disabled]  
Set this item to [Enabled] to use the ASUS MyLogo 2™ feature.  
Chapter 2: BIOS information  
2-25  
 
Post Report [5 sec]  
This item appears only when the Full Screen Logo item is set 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  
Fast Boot [Enabled]  
Enable or disable boot with initialization of a minimal set of devices to launch active boot  
option. Configuration options: [Disabled] [Enabled]  
The following three items appear only when you set Fast Boot to [Enabled].  
USB Support [Partial Initial]  
[Disabled]  
All USB devices will not be available until OS boot up for a fastest POST  
time.  
[Full Initial]  
[Partial Initial]  
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.  
PS/2 Keyboard and Mouse Support [Auto]  
[Auto]  
For a faster BIOS POST time, PS/2 devices will only be available when  
the system boots up. PS/2 devices will not be available and BIOS Setup  
program will not be accessible via PS/2 devices when the system is  
restarted.  
[Full Initial]  
[Disabled]  
For full system control, PS/2 devices will be available during POST at any  
circumstances. This process will extend the POST time.  
All PS/2 devices will not be available until OS bootup for a fastest POST  
time.  
Network Stack Driver Support [Disabled]  
[Disabled]  
The BIOS skips over the Network Stack Driver and tries to boot from the  
next device.  
[Enabled]  
Allows the BIOS to boot from the Network Stack Driver.  
2.7.4  
Post Delay Time [3 sec]  
Allows you to set the POST Report wait time. This configuration only functions in Normal  
Boot mode. Configuration options: [0 sec] [1 sec] [2 sec] [3 sec] [4 sec] [5 sec] [6 sec] [7 sec]  
[8 sec] [9 sec] [10 sec]  
2.7.5  
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]  
2-26  
ASUS F2A55-M LK Series  
 
2.7.6  
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.  
2.7.7  
[Normal Boot]  
Next boot after AC Power Loss [Normal Boot]  
Returns to normal boot on the next boot after an AC power loss.  
Accelerates the boot speed on the next boot after an AC power loss.  
[Fast Boot]  
2.7.8  
CSM Parameters  
This option controls whether or not CSM (Compatibility Support Module) will be launched.  
Launch CSM [Auto]  
Configuration option: [Auto] [Enabled] [Disabled]  
The following four items appear only when you set Launch CSM to [Enabled].  
Boot Device Control [UEFI and Legacy OpROM]  
Configuration option: [UEFI and Legacy OpRom] [Legacy OpROM only] [UEFI only]  
Boot from Network Devices [Legacy OpROM first]  
Configuration option: [Legacy OpROM first] [UEFI driver first] [Ignore]  
Boot from Storage Devices [Legacy OpRom first]  
Configuration option: [Both, Legacy OpROM first] [Both, UEFI driver first] [Legacy  
OpROM first] [UEFI driver first] [Ignore]  
Boot from PCIe/PCI Expansion Devices [Legacy OpROM first]  
Configuration option: [Legacy OpROM first] [UEFI driver first]  
2.7.9  
Security Boot parameters  
This option allows you to configure the Secure Boot related parameters.  
OS Type [Windows 8 UEFI]  
Configuration option: [Windows 8 UEFI] [Other Legacy & UEFI]  
Secure Boot Mode [Standard]  
This item appears only when you set the OS Type to [Windows 8 UEFI]. Configuration  
option: [Standard] [Custom]  
The following items appear when Secure Boot Mode is set to [Custom].  
Key Management  
Default Key Provisioning [Disabled]  
Configuration options: [Enabled] [Disabled]  
Chapter 2: BIOS information  
2-27  
 
Manage All Factory Keys (PK, KEK, DB, DBX)  
Install default Secure Boot Keys  
Configuration options: [Yes] [No]  
Platform Key (PK)  
Set PK from File  
Configuration options: [Acpi (a0341d0, 0)\PCI (1212)\USB (2, 0)\]  
Get PK to File  
Configuration options: [OK]  
Delete the PK  
Configuration options: [Yes] [No]  
Key Exchange Key Database (KEK)  
Set KEK from File  
Configuration options: [OK]  
Get KEK to File  
Configuration options: [OK]  
Delete the KEK  
Configuration options: [Yes] [No]  
Append an entry to KEK  
Configuration options: [OK]  
Authorized Signature Database  
Set DB from File  
Configuration options: [OK]  
Get DB to File  
Configuration options: [OK]  
Delete the DB  
Configuration options: [Yes] [No]  
Append an entry to DB  
Configuration options: [OK]  
Forbidden Signature Database  
Set DBX from File  
Configuration options: [OK]  
Get DBX to File  
Configuration options: [OK]  
Delete the DBX  
Configuration options: [Yes] [No]  
Append an entry to DBX  
Configuration options: [OK]  
2-28  
ASUS F2A55-M LK Series  
2.7.10  
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.  
2.7.11  
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, 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.  
Chapter 2: BIOS information  
2-29  
 
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.  
Exit  
EFI BIOS Utility - Advanced Mode  
Main  
Ai Tweaker  
Advanced  
Monitor  
Boot  
Tool  
Be used to update BIOS  
>
ASUS EZ Flash 2 Utility  
ASUS SPD Information  
ASUS O.C. Profile  
>
>
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 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]  
2.8.3  
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.  
Label  
Allows you to input the label of the setup profile.  
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.  
2-30  
ASUS F2A55-M LK Series  
 
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.  
Exit  
Load Optimized Defaults  
Save Changes & Reset  
Discard Changes & Exit  
ASUS EZ Mode  
Launch EFI Shell from filesystem device  
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 UEFI Shell application (shellx64.efi) from one  
of the available devices that have a filesystem.  
Chapter 2: BIOS information  
2-31  
 
2-32  
ASUS F2A55-M LK Series  
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  
ASUS F2A55-M LK Series  
 
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.  
A-3  
ASUS F2A55-M LK Series  
 
A-4  
Appendices  

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