Asus F2A55-M LK2 PLUS User Manual

F2A55-M LK2 Series

• F2A55-M LK2

• F2A55-M LK2 PLUS

Motherboard

E7838
First Edition

October 2012

Copyright © 2012 ASUSTeK COMPUTER INC. All Rights Reserved.

No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any
means, except documentation kept by the purchaser for backup purposes, without the express written
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Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the

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ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS

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ii

Contents

Safety information ...................................................................................................... vi

About this guide ........................................................................................................ vii

F2A55-M LK2 Series specications summary ......................................................... ix

Package contents ....................................................................................................... xi

Product introduction

1.1 Special features ............................................................................................ 1-1

1.1.1 Product highlights ...........................................................................

1.1.2 ASUS DIGI+ VRM ...........................................................................

1.1.3 ASUS Exclusive Features ...............................................................

1.2 Before you proceed ......................................................................................

1.3 Motherboard overview .................................................................................

1.3.1 Placement direction ........................................................................

1.3.2 Screw holes ....................................................................................

1.3.3 Motherboard layout .........................................................................

1.3.4 Layout contents ...............................................................................

1.4 Accelerated Processing Unit (APU) ............................................................

1.4.1 APU installation ...............................................................................

1.4.2 APU heatsink and fan assembly installation ...................................

1.5 System memory ..........................................................................................

1.5.1 Overview .......................................................................................

1.5.2 Memory congurations ..................................................................

1.5.3 Installing a DIMM ..........................................................................

1.6 Expansion slots ..........................................................................................

1.6.1 Installing an expansion card .........................................................

1.6.2 Conguring an expansion card .....................................................

1.6.3 PCI slot .........................................................................................

1.6.4 PCI Express x1 slot .......................................................................

1.6.5 PCI Express x16 slot .....................................................................

1.7 Jumpers

1.8 Connectors ..................................................................................................

1.8.1 Rear panel ports ...........................................................................

1.8.2 Internal connectors .......................................................................

1.9 Software support ........................................................................................

1.9.1 Installing an operating system ......................................................

1.9.2 Support DVD information ..............................................................

.......................................................................................................1-19

1-1

1-2

1-2

1-4

1-5

1-5

1-5

1-6

1-7

1-7

1-8

1-9

1-11

1-11

1-12

1-16

1-17

1-17

1-17

1-17

1-17

1-17

1-21

1-21

1-22

1-28

1-28

1-28

iii

BIOS information

2.1 Managing and updating your BIOS .............................................................2-1

2.1.1 ASUS Update utility ........................................................................

2.1.2 ASUS EZ Flash 2 ............................................................................

2.1.3 ASUS CrashFree BIOS 3 utility ......................................................

2.1.4 ASUS BIOS Updater .......................................................................

2.2 BIOS setup program .....................................................................................

2.3 Main menu ...................................................................................................

2.3.1 System Language [English] ..........................................................

2.3.2 System Date [Day xx/xx/xxxx] .......................................................

2.3.3 System Time [xx:xx:xx] .................................................................

2.3.4 Security .........................................................................................

2.4 Ai Tweaker menu ........................................................................................

2.4.1 Ai Overclock Tuner [Auto] .............................................................

2.4.2 Memory Frequency [Auto] .............................................................

2.4.3 APU Multiplier [Auto] .....................................................................

2.4.4

2.4.5 EPU Power Saving Mode [Disabled] ............................................

2.4.6 DRAM Timing Control ...................................................................

2.4.7 CPU Voltage [Offset Mode] ...........................................................

2.4.8 DRAM Voltage [Auto] ....................................................................

2.4.9 SB 1.1V Voltage [Auto] .................................................................

2.4.11 DIGI+ VRM ....................................................................................

2.5 Advanced menu ..........................................................................................

2.5.1 CPU Conguration ........................................................................

2.5.2 SATA Conguration .......................................................................

2.5.3 USB Conguration ........................................................................

2.5.4 NB Conguration ...........................................................................

2.5.5 Onboard Devices Conguration ....................................................

2.5.6 APM ..............................................................................................

2.5.7 Network Stack ...............................................................................

2.6 Monitor menu ..............................................................................................

2.6.1 CPU Temperature / MB Temperature [xxxºC/xxxºF]

2.6.2 CPU / Chassis fan Speed [xxxx RPM] or [Ignore] / [N/A] ..............

2.6.3 CPU Q-Fan Control [Enabled] ......................................................

2.6.4 CPU Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage ..................

2.6.5 Anti Surge Support [Auto] .............................................................

NB Frequency [Auto] .....................................................................2-13

...................... 2-23

2-1

2-2

2-3

2-4

2-6

2-10

2-10

2-10

2-10

2-10

2-12

2-13

2-13

2-13

2-13

2-14

2-14

2-14

2-14

2-15

2-17

2-17

2-18

2-19

2-19

2-20

2-21

2-22

2-23

2-23

2-23

2-24

2-24

iv

2.7 Boot menu ................................................................................................... 2-25

2.7.1 Fast Boot [Enabled] ......................................................................

2.7.2 Full Screen Logo [Enabled] ...........................................................

2.7.3 Post Delay Time [3 sec] ................................................................

2.7.4 Bootup NumLock State [On] .........................................................

2.7.5 Wait for ‘F1’ If Error [Enabled] .......................................................

2.7.6 Option ROM Messages [Force BIOS] ...........................................

2.7.7 Setup Mode [EZ Mode] .................................................................

2.7.8 CSM Parameters ..........................................................................

2.7.9 Secure Boot ..................................................................................

2.7.10 Boot Option Priorities ....................................................................

2.7.11 Boot Override ................................................................................

2.8 Tools menu ..................................................................................................

2.8.1 ASUS EZ Flash 2 Utility ................................................................

2.8.2 ASUS SPD Information .................................................................

2.8.3 ASUS O.C. Prole .........................................................................

2.9 Exit menu ....................................................................................................

2-26

2-26

2-27

2-27

2-27

2-27

2-27

2-27

2-28

2-29

2-29

2-30

2-30

2-30

2-30

2-31

Appendices

Notices ..................................................................................................................... A-1

ASUS contact information ...................................................................................... A-3

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 x it by yourself. Contact a qualied 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 qualied service

•
technician or your retailer.

vi

About this guide

This user guide contains the information you need when installing and conguring 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 nd more information

Refer to the following sources for additional information and for product and software
updates.

1. ASUS websites

The ASUS website provides updated information on ASUS hardware and software
products. Refer to the ASUS contact information.

2. Optional documentation

Your product package may include optional documentation, such as warranty yers,

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 Indicates a menu or an item to select.

Italics

<Key> Keys enclosed in the less-than and greater-than sign

<Key1> + <Key2> + <Key3> If you must press two or more keys simultaneously, the key

Used to emphasize a word or a phrase.

means that you must press the enclosed key.

Example: <Enter> means that you must press the Enter or
Return key.

names are linked with a plus sign (+).

viii

F2A55-M LK2 Series specications summary

APU AMD Socket FM2 A-series/Athlon™ Series Processors

AMD® Turbo Core Technology 3.0 support

Microsoft® DirectX® 11 support

• Refer to www.asus.com for the AMD® APU support list.

Chipset AMD® A55 FCH (Hudson D2)

Memory 2 x 240-pin DIMM slots support maximum 32GB unbuffered non-ECC

Graphics Integrated AMD® Radeon™ HD 7000 Series Graphics in the A-Series APU

Expansion slots 1 x PCIe 2.0 x16 slot

Storage / RAID AMD® A55 FCH:

LAN Realtek® 8111F PCIe Gigabit LAN controller

Audio Realtek

USB AMD® A55 FCH:

DDR3 1866 / 1600 / 1333 / 1066 MHz memory modules

Dual-channel memory architecture

Supports AMD Memory Prole (AMP) memory

• 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.

• Refer to

www.asus.com for the latest Memory QVL (Qualied Vendors List).

• When you install a total memory of 4GB capacity or more, Windows
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.

®

Supports DVI-D and D-Sub ports

Supports DVI with max. resolution 2560x1600@60Hz

Supports D-Sub with max. resolution 1920x1600@60Hz

AMD® Dual Graphics technology support*

Supports Microsoft® DirectX 11

• Refer to http://www.amd.com/us/products/technologies/dual-graphics/
Pages/dual-graphics.aspx#3 for the discrete GPUs which support Dual Graphics

technology.

1 x PCIe 2.0 x1 slots

1 x PCI slot

- 4 x Serial ATA 3.0Gb/s connectors support RAID 0, RAID 1, RAID 10

and JBOD congurations

®

ALC887-VD 8-channel High Denition Audio CODEC

• Use a chassis with HD audio module in the front panel to support an 8-channel
audio output.

- 8 x USB 2.0/1.1 ports (4 ports at the mid-board, 4 ports at the back

panel)

32-bit

(continued on the next page)

ix

F2A55-M LK Series specications summary

ASUS unique
features

Special features 100% All high quality conductive polymer (F2A55-M LK2 PLUS only)

Back Panel I/O
ports

Internal I/O
connectors /
buttons / switches

BIOS 32 Mb Flash ROM, UEFI AMI BIOS, PnP, DMI 2.0, WfM 2.0, SM

Support DVD Drivers

Form factor uATX form factor: 8.9 in x 7 in (22.6 cm x 17.8 cm)

ASUS DIGI+ VRM

ASUS 3+2 Phase Power Design

Network iControl

ASUS EPU

ASUS AI Suite II

ASUS UEFI BIOS EZ Mode

ASUS Anti-Surge Protection

ASUS Fan Xpert

ASUS CrashFree BIOS 3

ASUS EZ Flash 2

ASUS MyLogo 2™

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)

2 x USB 2.0/1.1 connectors support additional 4 USB 2.0/1.1 ports

4 x SATA 3.0Gb/s connectors

1 x COM connector

1 x System panel connector

1 x Internal Speaker connector

1 x CPU fan connector (4-pin)

1 x S/PDIF output connector

1 x Chassis fan connector (3-pin)

1 x Front panel audio connector

1 x 24-pin EATX power connector

1 x 4-pin ATX 12V power connector

BIOS 2.6, 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

ASUS Update

ASUS utilities

Anti-Virus software (OEM version)

Specications are subject to change without notice.

x

Package contents

F2A55-M LK2 PLUS

PCIEX16

PCIEX1_1

PCI1

SPDIF_OUT

ALC887

AAFP

CPU_FAN

CHA_FAN

Lithium Cell

CMOS Power

Super

I/O

AUDIO

DIGI

+VRM

RTL
8111F

KBMS

32Mb
BIOS

SB_PWR

CLRTC

USBPW5-8

USBPW1-4

AMD

®

A55

DDR3 DIMM_A1 (64bit, 240-pin module)

DDR3 DIMM_B1 (64bit, 240-pin module)

LAN1_USB12

USB34

SOCKET FM2

EATXPWR

ATX12V

SATA3G_3 SATA3G_4

SATA3G_2

SATA3G_1

SPEAKER

VGA

DVI

USB78 USB56

F_PANEL

COM1

KBPWR

User Guide

Check your motherboard package for the following items.

ASUS F2A55-M LK2 Series motherboard

2 x Serial ATA 3.0 Gb/s

1 x I/O Shield User Guide Support DVD

• F2A55-M LK2 Series motherboards include F2A55-M LK2 PLUS and F2A55-M LK2
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 specications may

vary with different models.

cables

xi

xii

Product introduction

1

1.1 Special features

1.1.1 Product highlights

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-efcient design to

enable accelerated performance and an industry-leading visual experience. It features Dual­channel 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 1866 / 1600 / 1333 / 1066 MHz Support

The motherboard supports the dual-channel DDR3 memory that features data transfer rates

of DDR3 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 denition audio

The onboard 8-channel HD audio (High Denition Audio, previously codenamed Azalia)
CODEC enables high-quality 192KHz/24-bit audio output and jack-detect feature that
automatically detects and identies what types of peripherals are plugged into the audio
I/O jacks and noties 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 efcient power management for advanced operating

systems.

100% All High-quality Conductive Polymer Capacitors (F2A55-M LK2 PLUS
only)

This motherboard uses all high-quality conductive polymer capacitors for durability, improved
lifespan, and enhanced thermal capacity.

ASUS F2A55-M LK2 Series

1-1

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-dened
proles. The effect is that DIGI+ VRM technology ensures greater energy efciency 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 ofce

work and heavy multitasking. Engineered and tested to assure unmitigated performance,

ASUS A55 boards with DIGI+ VRM remain efcient 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 rst mouse-controlled intuitive

graphical BIOS interface that goes beyond the traditional keyboard-only BIOS controls,

providing you with more exibility, 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 difcult POST situations.

EPU

EPU (Energy Processing Unit), the world’s rst 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.

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).

1-2

Chapter 1: Product introduction

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 congure 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 oppy 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 le from a USB storage
device that contains the BIOS le.

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 efciency requirements in regards to energy

consumptions. This is in line with ASUS vision of creating environment-friendly and energy-

efcient products through product design and innovation to reduce carbon footprint of the

product and thus mitigate environmental impacts.

ASUS F2A55-M LK2 Series

1-3

1.2 Before you proceed

F2A55-M LK2 PLUS

SB_PWR

ON

Standby Power Powered Off

OFF

F2A55-M LK2 PLUS Onboard LED

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.

1-4

Chapter 1: Product introduction

F2A55-M LK2 PLUS

1.3 Motherboard overview

1.3.1 Placement direction

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.

ASUS F2A55-M LK2 Series

1-5

1.3.3 Motherboard layout

F2A55-M LK2 PLUS

KBPWR

PCIEX16

PCIEX1_1

PCI1

SPDIF_OUT

ALC887

AAFP

CPU_FAN

CHA_FAN

Lithium Cell

CMOS Power

Super

I/O

AUDIO

DIGI

+VRM

RTL

8111F

KBMS

32Mb
BIOS

SB_PWR

CLRTC

USBPW5-8

USBPW1-4

17.3cm(6.8in)

AMD

®

A55

DDR3 DIMM_A1 (64bit, 240-pin module)

DDR3 DIMM_B1 (64bit, 240-pin module)

LAN1_USB12

USB34

SOCKET FM2

EATXPWR

ATX12V

SATA3G_3 SATA3G_4

SATA3G_2

SATA3G_1

SPEAKER

VGA

DVI

22.6cm(8.9in)

USB78 USB56

F_PANEL

COM1

5321 4

6

7

1

16

11 112 79 810131415

F2A55-M LK2 Series motherboards include F2A55-M LK2 PLUS and F2A55-M LK2
models. The package contents vary from models. The layout illustrations in this user guide
are for F2A55-M LK2 PLUS only.

1-6

Chapter 1: Product introduction

1.3.4 Layout contents

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS CPU socket FM2

Connectors/Jumpers/Slots/LED Page

1. Keyboard power (3-pin KBPWR) 1-21

2. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)

3. AMD FM2 socket

4. CPU fan connector (4-pin CPU_FAN)

5. DDR3 DIMM slots

6. SATA 3.0Gb/s connectors (7-pin SATA3G_1~4)

7. Clear RTC RAM (3-pin CLRTC)

8. System panel connector (10-1 pin F_PANEL)

9. Speaker connector (4-pin SPEAKER)

10. USB 2.0 connectors (10-1 pin USB56, USB78)

11. Serial port connector (10-1 pin COM)

12. Digital audio connector (4-1 pin SPDIF_OUT)

13. Front panel audio connector (10-1 pin AAFP)

14. Standby power LED (SB_PWR)

15. Chassis fan connector (3-pin CHA_FAN)

16. USB device wake-up (3-pin USBPW1-4, 3-pin USBPW5-8)

1-24

1-7

1-23

1-11

1-25

1-20

1-26

1-26

1-28

1-28

1-27

1-27

1-4

1-23

1-21

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 ts in only one correct

orientation. DO NOT force the APU into the socket to prevent bending the pins and
damaging the APU!

ASUS F2A55-M LK2 Series

1-7

1.4.1 APU installation

1

2

43

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

53 4

ASUS F2A55-M LK2 Series

1-9

To uninstall the APU heatsink and fan assembly

1

3

2

4

5

1-10

Chapter 1: Product introduction

1.5 System memory

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS 240-pin DDR3 DIMM sockets

DIMM_A1

DIMM_B1

1.5.1 Overview

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 gure illustrates the location of the DDR3 DIMM sockets:

Channel Sockets

Channel A DIMM_A1

Channel B DIMM_B1

ASUS F2A55-M LK2 Series

1-11

1.5.2 Memory congurations

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 conguration. 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
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 efcient memory cooling system to support a full

memory load (2 DIMMs) or overclocking condition.

®

OS, when you install 4GB

®

F2A55-M LK2 Series Motherboard Qualied Vendors Lists (QVL)

DDR3 1866 MHz capability

Vendors Part No. Size SS/DS

CORSAIR CMT4GX3M2A1866C9(XMP) 4GB(2 x 2GB) DS - - 9-9-9-24 1.65V • •
CORSAIR CMT6GX3MA1866C9(XMP) 6GB(3 x 2GB) DS - - 9-9-9-24 1.65V • •
CORSAIR CMZ8GX3M2A1866C9(XMP) 8GB(2 x 4GB) DS - - 9-10-9-27 1.50V • •
G.SKILL F3-14900CL9Q-16GBZL(XMP1.3) 16GB(4GB x 4) DS - - 9-10-9-28 1.5V • •
G.SKILL F3-14900CL10Q2-64GBZLD(XMP1.3) 64GB(8GB x 8) DS - - 10-11-10-30 1.5V • •
G.SKILL F3-14900CL9D-8GBXL(XMP) 8GB(2 x 4GB) DS - - 9-10-9-28 1.5V • •
G.SKILL F3-14900CL9Q-8GBXL(XMP) 8GB(2GB x 4) DS - - 9-9-9-24 1.6V • •
KINGSTON KHX1866C9D3K4/16GX(XMP) 16GB(4GB x 4) DS - - - 1.65V • •
KINGSTON KHX1866C9D3T1K3/6GX(XMP) 6GB(3 x 2GB) DS - - - 1.65V • •
KINGSTON KHX1866C11D3P1K2/8G 8GB(4GB x 2) DS - - - 1.5V • •
KINGSTON KHX1866C9D3K2/8GX(XMP) 8GB(4GB x 2) DS - - - 1.65V • •

1-12

Chip

Chip NO. Timing Voltage

Brand

Chapter 1: Product introduction

DIMM socket
support (Optional)

1 DIMM 2 DIMMs

DDR3 1600 MHz capability

DIMM socket

Vendors Part No. Size

A-DATA AM2U16BC2P1 2GB SS A-DATA

A-DATA AM2U16BC4P2 4GB DS A-DATA

A-DATA AX3U1600GC4G9-2G(XMP) 8GB(2 x 4GB) DS - - 9-9-9-24 1.55V-1.75V • •
A-DATA AX3U1600XC4G79-2X(XMP) 8GB(2 x 4GB) DS - - 7-9-7-21 1.55V-1.75V • •

Apacer 78.B1GE3.9L10C 4GB DS

CORSAIR CMD12GX3M6A1600C8(XMP) 12GB(6 x 2GB) DS - - 8-8-8-24 1.65V • •
CORSAIR CMZ32GX3M4X1600C10(XMP) 32GB(8GB x 4) DS - - 10-10-10-27 1.50V • •
CORSAIR CMP4GX3M2A1600C8(XMP) 4GB(2 x 2GB) DS - - 8-8-8-24 1.65V • •
CORSAIR CMP4GX3M2A1600C9(XMP) 4GB(2 x 2GB) DS - - 9-9-9-24 1.65V • •
CORSAIR CMP4GX3M2C1600C7(XMP) 4GB(2 x 2GB) DS - - 7-8-7-20 1.65V • •
CORSAIR CMX4GX3M2A1600C9(XMP) 4GB(2 x 2GB) DS - - 9-9-9-24 1.65V • •
CORSAIR CMX4GX3M2A1600C9(XMP) 4GB(2 x 2GB) DS - - 9-9-9-24 1.65V • •
CORSAIR TR3X6G1600C8 G(XMP) 6GB(3 x 2GB) DS - - 8-8-8-24 1.65V • •
CORSAIR TR3X6G1600C8D G(XMP) 6GB(3 x 2GB) DS - - 8-8-8-24 1.65V • •
CORSAIR TR3X6G1600C9 G(XMP) 6GB(3 x 2GB) DS - - 9-9-9-24 1.65V • •
CORSAIR CMP8GX3M2A1600C9(XMP) 8GB(2 x 4GB) DS - - 9-9-9-24 1.65V • •
CORSAIR CMZ8GX3M2A1600C7R(XMP) 8GB(2 x 4GB) DS - - 7-8-7-20 1.50V • •
CORSAIR CMX8GX3M4A1600C9(XMP) 8GB(4 x 2GB) DS - - 9-9-9-24 1.65V • •
Crucial BL25664BN1608.16FF(XMP) 6GB(3 x 2GB) DS - - - - • •
G.SKILL F3-12800CL7D-4GBRH(XMP) 4GB(2 x 2GB) SS - - 7-7-7-24 1.6V • •
G.SKILL F3-12800CL7D-4GBECO(XMP) 4GB(2 x 2GB) DS - - 7-7-8-24 XMP 1.35V • •
G.SKILL F3-12800CL7D-4GBRM(XMP) 4GB(2 x 2GB) DS - - 7-8-7-24 1.6V • •
G.SKILL F3-12800CL8D-4GBRM(XMP) 4GB(2 x 2GB) DS - - 8-8-8-24 1.60V • •
G.SKILL F3-12800CL9D-4GBECO(XMP) 4GB(2 x 2GB) DS - - 9-9-9-24 XMP 1.35V • •
G.SKILL F3-12800CL9D-4GBRL(XMP) 4GB(2 x 2GB) DS - - 9-9-9-24 1.5V • •
G.SKILL F3-12800CL9T-6GBNQ(XMP) 6GB(3 x 2GB) DS - - 9-9-9-24 1.5V~1.6V • •
G.SKILL F3-12800CL7D-8GBRH(XMP) 8GB(2 x 4GB) DS - - 7-8-7-24 1.6V • •
G.SKILL F3-12800CL8D-8GBECO(XMP) 8GB(2 x 4GB) DS - - 8-8-8-24 XMP 1.35V • •
G.SKILL F3-12800CL9D-8GBRL(XMP) 8GB(2 x 4GB) DS - - 9-9-9-24 1.5V • •
GEIL GET316GB1600C9QC(XMP) 16GB(4 x 4GB) DS - - 9-9-9-28 1.6V • •
GEIL GV34GB1600C8DC(XMP) 2GB DS - - 8-8-8-28 1.6V • •

HYNIX HMT351U6CFR8C-PB 4GB DS HYNIX

KINGMAX FLGE85F-B8KJ9A FEIS(XMP) 2GB DS - - - - • •
KINGMAX FLGE85F-B8MF7 MEEH(XMP) 2GB DS - - 7 - • •
KINGSTON KHX1600C9D3P1K2/4G 4GB(2 x 2GB) SS - - - 1.5V • •
KINGSTON KHX1600C9D3K3/12GX(XMP) 12GB(3 x 4GB) DS - - 9-9-9-27 1.65V • •
KINGSTON KHX1600C9D3T1BK3/12GX(XMP) 12GB(3 x 4GB) DS - - 9-9-9-27 1.65V • •
KINGSTON KHX1600C9D3K4/16GX(XMP) 16GB(4GB x 4) DS - - - 1.65V • •
KINGSTON KHX1600C10D3B1K2/16G 16GB(8GB x 2) DS - - - 1.5V • •
KINGSTON KHX16C9K2/16 16GB(8GB x 2) DS - - - 1.5V • •
KINGSTON KHX1600C9AD3/2G 2GB DS - - - 1.65V • •

KINGSTON KVR1600D3N11/2G-ES 2GB DS KTC

KINGSTON KHX1600C7D3K2/4GX(XMP) 4GB(2 x 2GB) DS - - - 1.65V • •
KINGSTON KHX1600C8D3K2/4GX(XMP) 4GB(2 x 2GB) DS - - 8 1.65V • •
KINGSTON KHX1600C8D3T1K2/4GX(XMP) 4GB(2 x 2GB) DS - - 8 1.65V • •
KINGSTON KHX1600C9D3K2/4GX(XMP) 4GB(2 x 2GB) DS - - 9 1.65V • •
KINGSTON KHX1600C9D3LK2/4GX(XMP) 4GB(2 x 2GB) DS - - 9 XMP 1.35V • •
KINGSTON KHX1600C9D3X2K2/4GX(XMP) 4GB(2 x 2GB) DS - - 9-9-9-27 1.65V • •
KINGSTON KHX1600C9D3T1K3/6GX(XMP) 6GB(3 x 2GB) DS - - - 1.65V • •
KINGSTON KHX1600C9D3K3/6GX(XMP) 6GB(3 x 2GB) DS - - 9 1.65V • •
KINGSTON KHX1600C9D3T1BK3/6GX(XMP) 6GB(3 x 2GB) DS - - 9-9-9-27 1.65V • •
KINGSTON KHX1600C9D3K2/8GX(XMP) 8GB(2 x 4GB) DS - - 9-9-9-27 1.65V •
KINGSTON KHX1600C9D3P1K2/8G 8GB(2 x 4GB) DS - - - 1.5V • •
Super

WA160UX6G9 6GB(3 x 2GB) DS - - 9 - • •

Talent

SanMax SMD-4G68HP-16KZ 4GB DS HYNIX

Apacer 78.B1GE3.9L10C 4GB DS

KINGSTON KHX1600C10D3B1K2/16G 16GB(8GB x 2) DS - - - 1.5V • •
KINGSTON KHX16C9K2/16 16GB(8GB x 2) DS - - - 1.5V • •

Elixir M2X8G64CB8HB5N-DG(XMP) 8GB DS Elixir 1213

SS/DSChip

Brand

Apacer
KZZC

Apacer
KZZC

Chip NO. Timing Voltage

3CCD-1509A
EL1126T

3CCD-1509A
EL1126T

AM5D5908D
EQSCK

H5TQ2G83
CFR PBC

D1288JPN
DPLD9U

H5TQ2G83
BFR PBC

AM5D5908
DEQSCK

N2CB4G8
BOBN-DG

- - •

- - • •

- - • •

- - • •

11-11-11-28 1.35V-1.5V • •

- - • •

- - • •

- - • •

support
(Optional)

1 DIMM 2 DIMMs

ASUS F2A55-M LK2 Series

1-13

DDR3 1333 MHz capability

DIMM socket

1.25V-

1.35V(low
voltage)

1.35V(low
voltage)

1.3V(low
voltage)

1.35V(low
voltage)

support
(Optional)

1 DIMM 2 DIMMs

• •

• •

• •

• •

Vendors Part No. Size

A-DATA AD3U1333C2G9 2GB SS A-DATA 3CCD-1509HNA1126L - - • •
A-DATA AM2U139C2P1 2GB SS ADATA 3CCD-1509A EL1127T - - • •
A-DATA AX3U1333C2G9-BP 2GB SS - - - - • •

A-DATA AXDU1333GC2G9-2G(XMP) 4GB(2 x 2GB) SS - - 9-9-9-24

A-DATA AD63I1C1624EV 4GB DS A-Data 3CCA-1509A - - • •
A-DATA AM2U139C4P2 4GB DS ADATA 3CCD-1509A EL1127T - - • •
A-DATA SU3U1333W8G9-B 8GB DS ELPIDA J4208BASE-DJ-F - - • •
Apacer 78.A1GC6.9L1 2GB DS Apacer AM5D5808DEWSBG - - • •
Apacer 78.A1GC6.9L1 2GB DS Apacer AM5D5808FEQSBG 9 - • •
Apacer AU02GFA33C9NBGC 2GB DS Apacer AM5D5808APQSBG - - • •
Apacer 78.B1GDE.9L10C 4GB DS Apacer AM5D5908CEHSBG - - • •
CORSAIR TR3X6G1333C9 G 6GB(3x 2GB) SS - - 9-9-9-24 1.50V • •
CORSAIR CMD24GX3M6A1333C9(XMP) 24GB(6x4GB) DS - - 9-9-9-24 1.60V • •
CORSAIR TW3X4G1333C9D G 4GB(2 x 2GB) DS - - 9-9-9-24 1.50V • •

CORSAIR CM3X4GA1333C9N2 4GB DS CORSAIR

CORSAIR CMX4GX3M1A1333C9 4GB DS - - 9-9-9-24 1.50V • •
CORSAIR CMD8GX3M4A1333C7 8GB(4 x 2GB) DS - - 7-7-7-20 1.60V • •
Crucial CT25664BA1339.16FF 2GB DS Micron 9KF27D9KPT 9 - • •
Crucial BL25664BN1337.16FF (XMP) 6GB(3 x 2GB) DS - - 7-7-7-24 1.65V • •

ELPIDA EBJ21UE8EDF0-DJ-F 2GB DS ELPIDA J1108EDSE-DJ-F -

G.SKILL F3-10666CL8D-4GBECO(XMP) 4GB(2 x 2GB) DS - - 8-8-8-24 XMP 1.35V • •
G.SKILL F3-10666CL7D-8GBRH(XMP) 8GB(2 x 4GB) DS - - 7-7-7-21 1.5V • •

GEIL GG34GB1333C9DC 4GB(2 x 2GB) DS GEIL GL1L128M88BA12N 9-9-9-24

GEIL GV34GB1333C9DC 4GB(2 x 2GB) DS - - 9-9-9-24 1.5V • •
GEIL GVP34GB1333C7DC 4GB(2 x 2GB) DS - - 7-7-7-24 1.5V • •
Hynix HMT325U6BFR8C-H9 2GB SS Hynix H5TQ2G83BFRH9C - - • •

Hynix HMT125U6TFR8A-H9 2GB DS Hynix H5TC1G83TFRH9A -

Hynix HMT351U6BFR8C-H9 4GB DS Hynix H5TQ2G83BFRH9C - - • •
KINGMAX FLFE85F-C8KF9 CAES 2GB SS KINGMAX KFC8FMFXF-DXX-15A - - • •
KINGMAX FLFE85F-C8KL9 NAES 2GB SS KINGMAX KFC8FNLXF-DXX-15A - - • •
KINGMAX FLFE85F-C8KM9 NAES 2GB SS KINGMAX KFC8FNMXF-BXX-15A - - • •
KINGMAX FLFE85F-B8KL9 NEES 2GB DS KINGMAX KKB8FNWBFGNX-26A - - • •
KINGMAX FLFF65F-C8KL9 NEES 4GB DS KINGMAX KFC8FNLXF-DXX-15A - - • •
KINGMAX FLFF65F-C8KM9 NEES 4GB DS KINGMAX KFC8FNMXF-BXX-15A - - • •
KINGSTON KVR1333D3N9/2G(low prole) 2GB SS Hynix H5TQ2G83AFRH9C 9 - • •
KINGSTON KVR1333D3S8N9/2G 2GB SS Micron IID77 D9LGK - 1.5V • •

KVR1333D3S8N9/2G-SP(low

KINGSTON

prole)

KINGSTON KVR1333D3N9/2G(low prole) 2GB DS ELPIDA J1108BFBG-DJ-F 9 1.5V • •
KINGSTON KVR1333D3N9/2G 2GB DS KTC D1288JPNDPLD9U 9 1.5V • •
KINGSTON KVR1333D3N9/2G 2GB DS ELPIDA J1108BDSE-DJ-F 9 1.5V • •

KVR1333D3N9/2G-SP(low

KINGSTON

prole)

KVR1333D3N9/2G-SP(low

KINGSTON

prole)

KINGSTON KHX1333C7D3K2/4GX(XMP) 4GB(2 x 2GB) DS - - 7 1.65V • •
KINGSTON KHX1333C9D3UK2/4GX(XMP) 4GB(2 x 2GB) DS - - 9 XMP 1.25V • •
KINGSTON KVR1333D3N9/4G(low prole) 4GB DS ELPIDA J2108BCSE-DJ-F 9 1.5V • •
KINGSTON KVR1333D3N9/4G(low prole) 4GB DS ELPIDA J2108BCSE-DJ-F - 1.5V • •
KINGSTON KVR1333D3N9/4G 4GB DS KTC D2568JENCNGD9U - 1.5V • •
KINGSTON KVR1333D3N9/4G 4GB DS Hynix H5TQ2G83AFR - - • •

KVR1333D3N9/4G-SP(low

KINGSTON

prole)

Micron MT8JTF25664AZ-1G4D1 2GB SS Micron OJD12D9LGK - - • •
Micron MT8JTF25664AZ-1G4M1 2GB SS MICRON IJM22 D9PFJ - - • •
Micron MT16JTF25664AZ-1G4F1 2GB DS Micron 9KF27D9KPT 9 - • •
Micron MT16JTF51264AZ-1G4D1 4GB DS Micron OLD22D9LGK - - • •
NANYA NT4GC64B8HG0NF-CG 4GB DS NANYA NT5CB256M8GN-CG - - • •
PSC AL8F8G73F-DJ2 2GB DS PSC A3P1GF3FGF - - • •
SAMSUNG M378B5773DH0-CH9 2GB SS SAMSUNG K4B2G0846D - - • •
SAMSUNG M378B5673FH0-CH9 2GB DS SAMSUNG K4B1G0846F - - • •
SAMSUNG M378B5273CH0-CH9 4GB DS SAMSUNG K4B2G0846C - - • •
Super Talent W1333UB2GS 2GB DS SAMSUNG K4B1G0846F 9 - • •
Super Talent W1333UB4GS 4GB DS SAMSUNG K4B2G0846C - - • •
Super Talent W1333UX6GM 6GB(3x 2GB) DS Micron 0BF27D9KPT 9-9-9-24 1.5V • •
KINGSTEK KSTD3PC-10600 2GB SS MICRON PE911-125E - - • •

2GB SS ELPIDA J2108BCSE-DJ-F - 1.5V • •

2GB DS KTC D1288JEMFNGD9U - 1.5V • •

2GB DS KINGSTON D1288JPSFPGD9U - 1.5V • •

4GB DS KINGSTON D2568JENCPGD9U - 1.5V • •

SS/

Chip Brand Chip NO. Timing Voltage

DS

256MBDCJGELC040
1136

9-9-9-24 - • •

1-14

Chapter 1: Product introduction

DDR3 1066 MHz capability

DIMM socket support

1.35V(low
voltage)

(Optional)
1 DIMM 2 DIMMs

• •

Vendors Part No. Size SS/DS Chip Brand Chip NO. Timing Voltage

Crucial CT12864BA1067.8FF 1GB SS Micron 9GF22D9KPT 7 - • •

ELPIDA EBJ21UE8EDF0-AE-F 2GB DS ELPIDA J1108EDSE-DJ-F -

KINGSTON KVR1066D3N7/1G(low prole) 1GB SS ELPIDA J1108BFSE-DJ-F 7 1.5V • •

KINGSTON KVR1066D3N7/4G 4GB DS Hynix H5TQ2G83AFR 7 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

conguration.

• 2 DIMMs: Supports two modules inserted into both the blue slots as one pair of Dual-

channel memory conguration.

Visit the ASUS website at www.asus.com for the latest QVL.

ASUS F2A55-M LK2 Series

1-15

1.5.3 Installing a DIMM

1

2

3

To remove a DIMM

1-16

B

A

Chapter 1: Product introduction

1.6 Expansion slots

In the future, you may need to install expansion cards. The following sub-sections describe
the slots and the expansion cards that they support.

Unplug the power cord before adding or removing expansion cards. Failure to do so may
cause you physical injury and damage motherboard components.

1.6.1 Installing an expansion card

To install an expansion card:

1. Before installing the expansion card, read the documentation that came with it and
make the necessary hardware settings for the card.

2. Remove the system unit cover (if your motherboard is already installed in a chassis).

3. 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 rmly until the card is completely

seated on the slot.

5. Secure the card to the chassis with the screw you removed earlier.

6. Replace the system cover.

1.6.2 Conguring an expansion card

After installing the expansion card, congure 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. Assign an IRQ to the card.

3. 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, conicts 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 specications.

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 specications.

1.6.5 PCI Express x16 slot

This motherboard supports one PCI Express x16 graphics card that complies with the PCI

Express specications.

ASUS F2A55-M LK2 Series

1-17

IRQ assignments for this motherboard

A B C D E F G H

PCIEx16_1 – – shared – – – – –

PCIEx1_1 shared – – – – – – –

PCI1 slot – – – – shared – – –

Realtek LAN controller – shared – – - – – –

HD audio shared – – – – – – –

SATA controller – – – shared – – – –

On Chip USB EHCI 1/2/3 – shared – – – – – –

On Chip USB EHCI 1/2/3/4 – – shared – – – – –

1-18

Chapter 1: Product introduction

1.7 Jumpers

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS Clear RTC RAM

1 2 2 3

Normal

(Default)

Clear RTC

CLRTC

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.

To erase the RTC RAM:

1. Turn OFF the computer and unplug the power cord.

2. 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. Plug the power cord and turn ON the computer.

4. Hold down the

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!

<Del> key during the boot process and enter BIOS setup to

• 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.

ASUS F2A55-M LK2 Series

1-19

2. USB device wake-up (3-pin USBPW1-4, 3-pin USBPW5-8)

F2A55-M LK2 PLUS

21

2 3

+5V

(Default)

+5VSB

USBPW5-8

21

2 3

+5V

+5VSB

(Default)

USBPW1-4

F2A55-M LK2 PLUS USB Device Wake Up

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS Keyboard power setting

21

+5V

(Default)

2 3

+5VSB

KBPWR

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).

• 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.

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.

1-20

Chapter 1: Product introduction

1.8 Connectors

3 42

57 69 8

1

10

1.8.1 Rear panel ports

1. PS/2 Mouse port (green). This port is for a PS/2 mouse.

2. LAN (RJ-45) port.

through a network hub.

LAN port LED indications

Activity/Link LED Speed LED
Status Description Status Description

OFF No link OFF 10Mbps connection
ORANGE Linked ORANGE 100Mbps connection
BLINKING Data activity GREEN 1Gbps connection

3. Line In port (light blue). This port connects to the tape, CD, DVD player, or other

audio sources.

4. Line Out port (lime).

8-channel congurations, the function of this port becomes Front Speaker Out.

5. Microphone port (pink).

This port allows Gigabit connection to a Local Area Network (LAN)

LED

LAN port

SPEED

ACT/LINK

This port connects to a headphone or a speaker. In the 4, 6, and

This port connects to a microphone.

LED

Refer to the audio conguration table below for the function of the audio ports in 2, 4, 6, or
8-channel conguration.

Audio 2, 4, 6, or 8-channel conguration

Port

Light Blue (Rear panel) Line In Rear Speaker Out Rear Speaker Out Rear Speaker Out

Lime (Rear panel) Line Out Front Speaker Out Front Speaker Out Front Speaker Out

Pink (Rear panel) Mic In Mic In Bass/Center Bass/Center

Lime (Front panel) — — — Side Speaker Out

To congure an 8-channel audio output:

Use a chassis with HD audio module in the front panel to support an 8-channel audio

output.

ASUS F2A55-M LK2 Series

Headset

2-channel

4-channel 6-channel 8-channel

1-21

6. USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are for USB

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS Fan connectors

CPU_FAN

CPU FAN PWM

CPU FAN IN

CPU FAN PWR

GND

CHA_FAN

Rotation

+12V

GND

2.0/1.1 devices.

7. USB 2.0 ports 3 and 4.

These two 4-pin Universal Serial Bus (USB) ports are for USB

2.0/1.1 devices.

8. Video Graphics Adapter (VGA) port.

This 15-pin port is for a VGA monitor or other

VGA-compatible devices.

9. 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.

DO NOT forget to connect the fan cables to the fan connectors. Insufcient air ow 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.

1-22

Chapter 1: Product introduction

2. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS ATX power connectors

EATXPWR

PIN 1

PIN 1

GND
+5 Volts
+5 Volts
+5 Volts

-5 Volts
GND
GND
GND
PSON#
GND

-12 Volts
+3 Volts

+3 Volts
+12 Volts
+12 Volts

+5V Standby

Power OK

GND

+5 Volts

GND

+5 Volts

GND
+3 Volts
+3 Volts

ATX12V

+12V DC

+12V DC

GND

GND

These connectors are for an ATX power supply. The plugs from the power supply are

designed to t these connectors in only one orientation. Find the proper orientation and
push down rmly until the connectors completely t.

•

We recommend that you use an ATX 12V Specication 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 conguring 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.
com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-us for details.

ASUS F2A55-M LK2 Series

1-23

3. Serial ATA 3.0 Gb/s connectors (7-pin SATA3G 1~4)

GND

RSATA_RXP1

RSATA_RXN1

GND

RSATA_TXN1

RSATA_TXP1

GND

SATA3G_1

GND

RSATA_TXP2

RSATA_TXN2

GND

RSATA_RXN2

RSATA_RXP2

GND

SATA3G_2

GND

RSATA_TXP4

RSATA_TXN4

GND

RSATA_RXN4

RSATA_RXP4

GND

SATA3G_4

GND

RSATA_TXP3

RSATA_TXN3

GND

RSATA_RXN3

RSATA_RXP3

GND

SATA3G_3

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS SATA 3.0Gb/s connectors

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 conguration through the onboard controller.

• 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 Conguration for details.

• You must install Windows
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 Conguration for details.

®

XP Service Pack 3 or later version before using Serial

1-24

Chapter 1: Product introduction

4. System panel connector (10-1 pin PANEL)

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS System panel connector

PIN 1

PWR BTN

PLED+

PLED-

PWR

GND

HD_LED+

HD_LED-

Ground

Reset

F_PANEL

PWR LED

HD_LED RESET

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS Speaker Out Connector

+5V

GND

GND

Speaker Out

SPEAKER

PIN 1

This connector supports several chassis-mounted functions.

• 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 ashes 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.

5. 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.

ASUS F2A55-M LK2 Series

1-25

6. Digital audio connector (4-1 pin SPDIF_OUT)

SPDIF_OUT

+5V

SPDIFOUT

GND

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS Digital audio connector

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS Front panel audio connector

AAFP

AGNDNCSENSE1_RETUR

SENSE2_RETUR

PORT1 L

PORT1 R

PORT2 R

SENSE_SEND

PORT2 L

HD-audio-compliant

pin definition

PIN 1

AGNDNCNC

NC

MIC2

MICPWR

Line out_R

NC

Line out_L

Legacy AC’97

compliant definition

This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port.

The S/PDIF module is purchased separately.

7. 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 Denition Audio or AC`97 audio standard. Connect one end of the front

panel audio I/O module cable to this connector.

• We recommend that you connect a high-denition front panel audio module to this

connector to avail of the motherboard high-denition audio capability.

• If you want to connect a high denition 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
Conguration for details.

• The front panel audio I/O module is purchased separately.

1-26

Chapter 1: Product introduction

8. USB 2.0 connectors (10-1 pin USB56, USB78)

F2A55-M LK2 PLUS

PIN 1

USB+5V

USB_P8-

USB_P8+

GND

NC

USB+5V

USB_P7-

USB_P7+

GND

USB78

PIN 1

USB+5V

USB_P6-

USB_P6+

GND

NC

USB+5V

USB_P5-

USB_P5+

GND

USB56

F2A55-M LK2 PLUS USB2.0 connectors

F2A55-M LK2 PLUS

F2A55-M LK2 PLUS Serial port (COM1) connector

PIN 1

COM1

DCD

TXD

GND

RTS

RI

RXD

DTR

DSR

CTS

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 specication that supports up to

480Mbps connection speed.

Never connect a 1394 cable to the USB connectors. Doing so will damage the
motherboard!

The USB 2.0 module is purchased separately.

9. 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.

The COM module is purchased separately.

ASUS F2A55-M LK2 Series

1-27

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

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

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
ASUS website at www.asus.com for updates.

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.

®

XP Service Pack 3 or later versions / Windows®

®

8.

Click an item to install

1-28

Click an icon to
display Support
DVD/motherboard
information

If Autorun is NOT enabled on your computer, browse the contents of the Support DVD to

locate the le ASSETUP.EXE from the BIN folder. Double-click the ASSETUP.EXE to run

the DVD.

Chapter 1: Product introduction

BIOS information

2

2.1 Managing and updating your BIOS

Save a copy of the original motherboard BIOS le to a USB ash 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. Place the support DVD in the optical drive. The

2. Click the

3. Follow the onscreen instructions to complete the installation.

Utilities tab, then click AI Suite II.

Specials menu appears.

Quit all Windows® applications before you update the BIOS using this utility.

Updating the BIOS

To update the BIOS:

®

1. From the Windows

II X.XX.XX to launch the AI Suite II utility. The AI Suite II Quick Bar appears.

2. Click

Chapter 2: BIOS information 2-1

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:

desktop, click Start > Programs > ASUS > AI Suite II > AI Suite

Updating from the Internet

a. Select

b. Select the ASUS FTP site nearest you to avoid network trafc, then click

Update BIOS from the Internet, then click Next.

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

b. Locate the BIOS le from the

Update BIOS from le, then click Next.

Open window, then click Open.

3. Follow the onscreen instructions to complete the updating process.

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 le from the ASUS website at

www.asus.com.

To update the BIOS using EZ Flash 2:

1. Insert the USB ash disk that contains the latest BIOS le to the USB port.

2. Enter the

ASUS EZ Flash 2 Utility and press <Enter> to enable it.

3. Press <Tab> to switch to the

4. Press the Up/Down arrow keys to nd the USB ash disk that contains the latest BIOS,

and then press <Enter>.

5. Press <Tab> to switch to the

6. Press the Up/Down arrow keys to nd the BIOS le, and then press <Enter> to perform

the BIOS update process. Reboot the system when the update process is done.

Advanced Mode of the BIOS setup program. Go to the Tool menu to select

Drive eld.

Folder Info eld.

• This function supports USB ash disks formatted using FAT 32/16 on a single partition.

• DO NOT shut down or reset the system while updating the BIOS to prevent system
boot failure!

2-2 ASUS F2A55-M LK2 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 le

when it fails or gets corrupted during the updating process. You can restore a corrupted BIOS

le using the motherboard support DVD or a USB ash drive that contains the updated BIOS
le.

• Before using this utility, rename the BIOS le in the removable device into

F2A5MLK2.CAP (for F2A55-M LK2) or F2A5MK2P.CAP (for F2A55-M LK2 PLUS).

• The BIOS le in the support DVD may not be the latest version. Download the latest
BIOS le 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 ash drive that contains the
BIOS le to the USB port.

3. The utility automatically checks the devices for the BIOS le. When found, the utility
reads the BIOS le 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 le 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 ash drive formatted using

FAT32/16 on a single partition.

2. Download the latest BIOS le and BIOS Updater from the ASUS website at
http://support.asus.com and save them on the USB ash drive.

NTFS is not supported under DOS environment. Do not save the BIOS le and BIOS
Updater to a hard disk drive or USB ash 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 ash drive with the latest BIOS le and BIOS Updater to the USB port.

2. Boot your computer. When the ASUS Logo appears, press <F8> to show the
Boot Device Select Menu. Insert the support DVD into the optical drive and select the
optical drive as the boot device.

BIOS

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. When the Make Disk menu appears, select the FreeDOS command prompt item by
pressing the item number.

4. At the FreeDOS prompt, type

d: and press <Enter> to switch the disk from Drive C

(optical drive) to Drive D (USB ash drive).

Welcome to FreeDOS (http://www.freedos.org)!

C:\>d:

D:\>

2-4 ASUS F2A55-M LK2 Series

Updating the BIOS le

To update the BIOS le using BIOS Updater

1. At the FreeDOS prompt, type

D:\>bupdater /pc /g

2. The BIOS Updater screen appears as below.

ASUSTek BIOS Updater for DOS V1.30

bupdater /pc /g and press <Enter>.

Current ROM

F2A55-M LK2 PLUS

BOARD:
VER: 0201
DATE: 07/13/2012

PATH: A:\

A:

Note

[Enter] Select or Load [Tab] Switch [V] Drive Info

[Up/Down/Home/End] Move [B] Backup [Esc] Exit

F2A5MKP2.CAP 8390656 2012-07-13 17:30:48

Update ROM

BOARD: Unknown
VER: Unknown
DATE: Unknown

3. Press <Tab> to switch between screen elds and use the <Up/Down/Home/End> keys
to select the BIOS le and press <Enter>. BIOS Updater checks the selected BIOS le
and prompts you to conrm 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 le 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 congure 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

• 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

<Ctrl>+<Alt>+<Del> simultaneously.

failed to enter BIOS Setup using the rst 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 LK2 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,
CPU/5V/3.3V/12V voltage output,
CPU/chassis fan speed

Exits the BIOS setup program without saving
the changes, saves the changes and resets
the system, or enters the Advanced Mode

Selects the Advanced
mode functions

Selects the boot
device priority

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

Power Saving mode

Normal mode

Selects the boot device priority

Displays the system properties of the
selected mode on the right hand side

Loads optimized default

ASUS Optimal mode

Advanced Mode

The Advanced Mode provides advanced options for experienced end-users to congure
the BIOS settings. The gure below shows an example of the Advanced Mode. Refer to the
following sections for the detailed congurations.

To access the EZ Mode, click Exit, then select ASUS EZ Mode.

Back button

Menu items

Menu bar

Conguration elds

General help

Submenu item

Menu bar

The menu bar on top of the screen has the following main items:

Main For changing the basic system conguration

Ai Tweaker For changing the overclocking settings

Advanced For changing the advanced system settings

Monitor For displaying the system temperature, power status, and changing the fan settings

Boot For changing the system boot conguration

Tool For conguring options for special functions

Exit For selecting the exit options and loading default settings

Pop-up window

Navigation keys

2-8 ASUS F2A55-M LK2 Series

Menu items

The highlighted item on the menu bar displays the specic 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 conguration

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 t 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.

Conguration elds

These elds show the values for the menu items. If an item is user-congurable, you can
change the value of the eld opposite the item. You cannot select an item that is not user­congurable.

A congurable eld is highlighted when selected. To change the value of a eld, 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. Conguration 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 LK2 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 elds in the BIOS setup program.

To set an administrator password:

1. Select the

2. From the

3. Conrm the password when prompted.

To change an administrator password:

1. Select the

2. From the
<Enter>.

3. From the

4. Conrm 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/conrm the password. After you clear

the password, the Administrator Password item on top of the screen shows Not Installed.

Administrator Password item and press <Enter>.

Create New Password box, key in a password, then press <Enter>.

Administrator Password item and press <Enter>.

Enter Current Password box, key in the current password, then press

Create New Password box, key in a new password, then press <Enter>.

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. Select the

2. From the

3. Conrm the password when prompted.

To change a user password:

1. Select the

2. From the
<Enter>.

3. From the

4. Conrm the password when prompted.

User Password item and press <Enter>.

Create New Password box, key in a password, then press <Enter>.

User Password item and press <Enter>.

Enter Current Password box, key in the current password, then press

Create New Password box, key in a new password, then press <Enter>.

To clear the user password, follow the same steps as in changing a user password, but press

<Enter> when prompted to create/conrm 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 congure overclocking-related items.

Be cautious when changing the settings of the Ai Tweaker menu items. Incorrect eld

values can cause the system to malfunction.

The conguration options for this section vary depending on the CPU and DIMM model you

installed on the motherboard.

Scroll down to display the following items:

2-12 ASUS F2A55-M LK2 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 conguration 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. Conguration options: [Auto] [DDR3­800MHz] [DDR3-1066MHz] [DDR3-1333MHz] [DDR3-1600MHz] [DDR3-1866MHz] [DDR3­2133MHz] [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. Conguration 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. Conguration options: [Auto] [Light Power

Saving Mode] [Medium Power Saving Mode] [Max Power Saving Mode]

Chapter 2: BIOS information 2-13

2.4.6 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.

2.4.7 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.

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.

2.4.8 DRAM Voltage [Auto]

Allows you to set the DRAM voltage. The values range from 1.35V to 1.65V with a 0.15V
interval.

2.4.9 SB 1.1V Voltage [Auto]

Allows you to set the Southbridge 1.1V voltage. The values range from 1.1V to 1.22V with a

0.04V interval.

• The values of the CPU Offset Voltage, VDDNB Offset Voltage, DRAM Voltage, and
SB 1.1V Voltage items are labeled in a different color, indicating the risk levels of high
voltage settings.

• The system may need a better cooling system to work properly under high voltage
settings.

2-14 ASUS F2A55-M LK2 Series

2.4.11 DIGI+ VRM

CPU Load Line Calibration [Auto]

Load-line Calibration is dened by AMD VRM specications 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. Conguration options: [Auto] [Regular] [Medium] [High]

[Extreme]

The actual performance boost may vary depending on your CPU speciation.

CPU/NB Load Line Calibration [Auto]

Allows you to select the CPU/NB Load-Line Calibration mode. Conguration options: [Auto]

[Regular] [High] [Extreme]

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.

Conguration 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.

Conguration 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 efciency.

[Standard] Proceeds phase control depending on the CPU loading.

[Optimized] Loads the ASUS optimized phase tuning prole.

[Extreme] Proceeds the full phase mode.

[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. Conguration 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.

Chapter 2: BIOS information 2-15

CPU Power Duty Control [T.Probe]

[T.Probe] Maintains the VRM thermal balance.

[Extreme] 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 LK2 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 eld values

can cause the system to malfunction.

2.5.1 CPU Conguration

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. Conguration options: [Enabled] [Disabled]

NX Mode [Enabled]

Enables or disables the No-execute page protection function. Conguration options:

[Enabled] [Disabled]

SVM [Enabled]

Enables or disables CPU virtualization. Conguration options: [Disabled] [Enabled]

CPB Mode [Auto]

Disables the CPB (Core Performance Boost) mode or set it to [Auto] for automatic

conguration. Conguration options: [Disabled] [Auto]

C6 Mode [Disabled]

Enables or disables C6 mode. Conguration options: [Enabled] [Disabled]

IOMMU [Disabled]

Set this item to [Enabled] to show IOMMU Mode. Conguration options: [Enabled] [Disabled]

Bank Interleaving [Disabled]

Enables or disables Bank Interleaving. Conguration options: [Enabled] [Disabled]

Channel Interleaving [Disabled]

Enables or disables Channel Interleaving. Conguration options: [Enabled] [Disabled]

Chapter 2: BIOS information 2-17

2.5.2 SATA Conguration

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. Conguration options: [Disabled] [Enabled]

OnChip SATA Type [AHCI]

Allows you to set the SATA conguration.

[IDE] Set to [IDE] when you want to use the Serial ATA hard disk drives as

[RAID] Set to [RAID] when you want to create a RAID conguration from the SATA

[AHCI] Set to [AHCI] when you want the SATA hard disk drives to use the AHCI

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. Conguration options: [Enabled] [Disabled]

Parallel ATA physical storage devices.

hard disk drives.

(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.

2-18 ASUS F2A55-M LK2 Series

2.5.3 USB Conguration

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.

USB Device Enable [Enabled]

[Enabled] Enables available USB devices.

[Disabled] Disables available USB devices.

Legacy USB Support [Enabled]

[Enabled] Enables the support for USB devices on legacy operating systems (OS).

[Disabled] The USB devices can be used only for the BIOS setup program.

[Auto] 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

[Disabled] Disables the function.

feature.

USB Single Port Control

Allows you to enable/disable individual USB ports.

2.5.4 NB Conguration

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.
Conguration options: [Disabled] [Enabled]

Primary Video Device [PCIE / PCI Video]

Selects the primary display device. Conguration options: [IGFX Video] [PCIE / PCI Video]

Integrated Graphics [Auto]

Enables the integrated graphics controller. Conguration options: [Auto] [Force]

UMA Frame Buffer Size [Auto]

This item appears only when you set the previous item to [Force]. Conguration options:

[Auto] [32M] [64M] [128M] - [2G]

Chapter 2: BIOS information 2-19

2.5.5 Onboard Devices Conguration

HD Audio Device [Enabled]

[Enabled] Enables the High Denition Audio Controller.

[Disabled] Disables the controller.

The following two items appear only when you set the HD Audio Device item to [Enabled].

Front Panel Type [HD]

Allows you to set the front panel audio connector (AAFP) mode to legacy AC’97 or high-

denition audio depending on the audio standard that the front panel audio module supports.

[HD] Sets the front panel audio connector (AAFP) mode to high denition audio.

[AC97] Sets the front panel audio connector (AAFP) mode to legacy AC’97.

SPDIF Out Type [SPDIF]

[SPDIF] Sets to [SPDIF] for SPDIF audio output.

[HDMI] Sets to [HDMI] for HDMI audio output.

Realtek LAN Controller [Enabled]

[Enabled] Enables the Realtek LAN controller.

[Disabled] 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. Conguration

options: [Enabled] [Disabled]

Serial Port Conguration

The sub-items in this menu allow you to set the serial port conguration.

Serial Port [Enabled]

Allows you to enable or disable the serial port (COM). Conguration options: [Enabled]

[Disabled]

Change Settings [Auto]

Allows you to select the Serial Port base address. Conguration options: [Auto]
[IO=3F8h; IRQ=4] [IO=2F8h; IRQ=3] [IO=3E8h; IRQ=4] [IO=2E8h; IRQ=3]

2-20 ASUS F2A55-M LK2 Series

2.5.6 APM

Restore AC Power Loss [Power Off]

[Power On] The system goes into on state after an AC power loss.

[Power Off] The system goes into off state after an AC power loss.

[Last State] The system goes into either off or on state, whatever the system state was

Power On By PS/2 Keyboard [Disabled]

[Disabled] Disables the Power On by a PS/2 keyboard.

[Space Bar] Sets the Space Bar on the PS/2 keyboard to turn on the system.

[Ctrl-Esc] 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

Power On By PS/2 Mouse [Disabled]

[Disabled] Disables the Power On by a PS/2 mouse.

[Enabled] Enables the Power On by a PS/2 mouse. This feature requires an ATX

Power On By PME [Disabled]

[Disabled] Disables the PME to wake up by PCI/PCIE devices.

[Enabled] Allows you to turn on the system through a PCI/PCIE LAN or modem card.

Power On By Ring [Disabled]

[Disabled] Disables Ring to generate a wake event.

[Enabled] Enables Ring to generate a wake event.

Power On By RTC [Disabled]

[Disabled] Disables RTC to generate a wake event.
[Enabled] When set to [Enabled], the items RTC Alarm Date (Days) and Hour/

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 / - Minute / - Second

Allows you to set the RTC alarm time. Use <+> and <-> keys to adjust the time.

before the AC power loss.

requires an ATX power supply that provides at least 1A on the +5VSB lead.

power supply that provides at least 1A on the +5VSB lead.

This feature requires an ATX power supply that provides at least 1A on the
+5VSB lead.

Minute/Second will become user-congurable with set values.

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. Conguration 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. Conguration 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. Conguration options: [Disable Link]

[Enabled]

2-22 ASUS F2A55-M LK2 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 eld

shows N/A. Select Ignore if you do not wish to display the detected speed.

2.6.3 CPU Q-Fan Control [Enabled]

[Disabled] Disables the CPU Q-Fan control feature.

[Enabled] Enables the CPU Q-Fan control feature.

Fan Speed Low Limit [200 RPM]

This item appears only when you enable the CPU Q-Fan Control feature and allows

you to disable or set the CPU fan warning speed. Conguration options: [Ignore]

[200RPM] [300 RPM] [400 RPM] [500 RPM] [600 RPM]

Chapter 2: BIOS information 2-23

Fan Profile [Standard]

This item appears only when you enable the CPU Q-Fan Control feature and allows
you to set the appropriate performance level of the CPU fan.

[Standard] Sets to [Standard] to make the CPU fan automatically adjust depending on

the CPU temperature.

[Silent] 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 Prole 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 [Auto]

This item allows you to enable or disable the Anti Surge function. Conguration options:

[Auto] [Disabled] [Enabled]

2-24 ASUS F2A55-M LK2 Series

2.7 Boot menu

The Boot menu items allow you to change the system boot options.

Scroll down to display the following items:

Chapter 2: BIOS information 2-25

2.7.1 Fast Boot [Enabled]

Enable or disable boot with initialization of a minimal set of devices to launch active boot
option. Conguration 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

[Full Initial] All USB devices will be available during POST. This process will extend the

[Partial Initial] For a faster POST time, only the USB ports with keyboard and mouse

PS/2 Keyboard and Mouse Support [Auto]

[Auto] For a faster BIOS POST time, PS/2 devices will only be available when

[Full Initial] For full system control, PS/2 devices will be available during POST at any

[Disabled] All PS/2 devices will not be available until OS bootup for a fastest POST

Network Stack Driver Support [Disabled]

[Disabled] The BIOS skips over the Network Stack Driver and tries to boot from the

[Enabled] Allows the BIOS to boot from the Network Stack Driver.

Next boot after AC Power Loss [Normal Boot]

[Normal Boot] Returns to normal boot on the next boot after an AC power loss.

[Fast Boot] Accelerates the boot speed on the next boot after an AC power loss.

time.

POST time.

connections will be detected.

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.

circumstances. This process will extend the POST time.

time.

next device.

2.7.2 Full Screen Logo [Enabled]

[Enabled] Enables the full screen logo display feature.

[Disabled] Disables the full screen logo display feature.

Set this item to [Enabled] to use the ASUS MyLogo 2™ feature.

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. Conguration options: [1 sec] [2

sec] [3 sec] [4 sec] [5 sec] [6 sec] [7 sec] [8 sec] [9 sec] [10 sec] [Until Press ESC]

2-26 ASUS F2A55-M LK2 Series

2.7.3 Post Delay Time [3 sec]

Allows you to set the POST Report wait time. This conguration only functions in Normal
Boot mode. Conguration options: [0 sec] [1 sec] [2 sec] [3 sec] [4 sec] [5 sec] [6 sec] [7 sec]

[8 sec] [9 sec] [10 sec]

2.7.4 Bootup NumLock State [On]

[On] Sets the power-on state of the NumLock to [On].

[Off] Sets the power-on state of the NumLock to [Off].

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. Conguration options: [Disabled] [Enabled]

2.7.6 Option ROM Messages [Force BIOS]

[Force BIOS] The third-party ROM messages will be forced to display during the boot

[Keep Current] The third-party ROM messages will be displayed only if the third-party

sequence.

manufacturer had set the add-on device to do so.

2.7.7 Setup Mode [EZ Mode]

[Advanced Mode] Sets Advanced Mode as the default screen for entering the BIOS setup

[EZ Mode] Sets EZ Mode as the default screen for entering the BIOS setup program.

program.

2.7.8 CSM Parameters

This option controls whether or not CSM (Compatibility Support Module) will be launched.

Launch CSM [Auto]

Conguration option: [Auto] [Enabled] [Disabled]

The following four items appear only when you set Launch CSM to [Enabled].

Boot Device Control [UEFI and Legacy OpROM]

Conguration option: [UEFI and Legacy OpRom] [Legacy OpROM only] [UEFI only]

Boot from Network Devices [Legacy OpROM first]

Conguration option: [Legacy OpROM rst] [UEFI driver rst] [Ignore]

Boot from Storage Devices [Legacy OpRom first]

Conguration option: [Both, Legacy OpROM rst] [Both, UEFI driver rst] [Legacy
OpROM rst] [UEFI driver rst] [Ignore]

Boot from PCIe/PCI Expansion Devices [Legacy OpROM first]

Conguration option: [Legacy OpROM rst] [UEFI driver rst]

Chapter 2: BIOS information 2-27

2.7.9 Secure Boot

This option allows you to congure the Secure Boot related parameters.

OS Type [Other OS]

Conguration option: [Windows UEFI mode] [Other OS]

Secure Boot Mode [Standard]

This item appears only when you set the OS Type to [Windows UEFI]. Conguration option:
[Standard] [Custom]

The following items appear when Secure Boot Mode is set to [Custom].

Key Management

Manage the Secure Boot Keys (PK, KEK, DB, DBX)

Install default Secure Boot Keys

Conguration options: [Yes] [No]

Platform Key (PK)

Load PK from File

Conguration options: [Acpi (a0341d0, 0)\PCI (1212)\USB (2, 0)\]

Copy PK to File

Conguration options: [OK]

Delete the PK

Conguration options: [Yes] [No]

KEK Management (KEK)

Load KEK from File

Conguration options: [OK]

Copy KEK to File

Conguration options: [OK]

Delete the KEK

Conguration options: [Yes] [No]

Append KEK from File

Conguration options: [OK]

2-28 ASUS F2A55-M LK2 Series

DB Management

Load DB from File

Conguration options: [OK]

Copy DB to File

Conguration options: [OK]

Delete the DB

Conguration options: [Yes] [No]

Append DB from File

Conguration options: [OK]

DBX Management

Load DBX from File

Conguration options: [OK]

Copy DBX to File

Conguration options: [OK]

Delete the DBX

Conguration options: [Yes] [No]

Append DBX from File

Conguration options: [OK]

2.7.10 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.

2.7.11 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 congure options for special functions. Select an item

then press <Enter> to display the submenu.

2.8.1 ASUS EZ Flash 2 Utility

Allows you to run ASUS EZ Flash 2. Press [Enter] to launch the ASUS EZ Flash 2 screen.

For more details, see section 2.1.2 ASUS EZ Flash 2.

2.8.2 ASUS SPD Information

DIMM Slot # [DIMM_A1]

Displays the Serial Presence Detect (SPD) information of the DIMM module installed on the

selected slot. Conguration options: [DIMM_A1] [DIMM_B1]

2.8.3 ASUS O.C. Prole

This item allows you to store or load multiple BIOS settings.

The Setup Prole Status items show Not Installed if no prole is created.

Label

Allows you to input the label of the setup prole.

Save to Prole

Allows you to save the current BIOS settings to the BIOS Flash, and create a prole. Key in a
prole number from one to eight, press <Enter>, and then select Yes.

Load from Prole

Allows you to load the previous BIOS settings saved in the BIOS Flash. Key in the prole

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 le only coming from the same memory/
CPU conguration and BIOS version.

2-30 ASUS F2A55-M LK2 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.

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 conrmation window appears.

Select Yes to load the default values.

Save Changes & Reset

Once you are nished 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 conrmation 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 conrmation 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 lesystem device

This option allows you to attempt to launch the UEFI Shell application (shellx64.e) from one
of the available devices that have a lesystem.

Chapter 2: BIOS information 2-31

2-32 ASUS F2A55-M LK2 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 modications 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 specications. 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.

ASUS F2A55-M LK2 Series

A-1

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
ASUS REACH website at http://csr.asus.com/english/REACH.htm.

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 15 Li-Te Road, Peitou, Taipei, Taiwan 11259
Telephone [phone]
Fax [phone]
E-mail [email protected]
Web site www.asus.com.tw

Technical Support

Telephone [phone]
Online support support.asus.com

ASUS COMPUTER INTERNATIONAL (America)

Address 800 Corporate Way, Fremont, CA 94539, USA
Telephone [phone]
Fax [phone]
Web site usa.asus.com

Technical Support

Telephone [phone]
Support fax [phone]
Online support support.asus.com

ASUS COMPUTER GmbH (Germany and Austria)

Address Harkort Str. 21-23, D-40880 Ratingen, Germany
Fax [phone]
Web site www.asus.de
Online contact www.asus.de/sales

Technical Support

Telephone [phone]*
Support Fax [phone]
Online support support.asus.com

* EUR 0.14/minute from a German xed landline; EUR 0.42/minute from a mobile phone.

Manufacturer: ASUSTeK Computer Inc.

Address: 4F, No.150, LI-TE RD., PEITOU, TAIPEI 112,

Authorised representative in
Europe:

Address: HARKORT STR. 21-23, 40880 RATINGEN,

ASUS F2A55-M LK2 Series

TAIWAN, R.O.C.

ASUS Computer GmbH

GERMANY

A-3

EC Declaration of Conformity

We, the undersigned,

Manufacturer:

ASUSTeK COMPUTER INC.

Address, City:

4F, No. 150, LI-TE Rd., PEITOU, TAIPEI 112, TAIWAN R.O.C.

Country:

TAIWAN

Authorized representative in Europe:

ASUS COMPUTER GmbH

Address, City:

HARKORT STR. 21-23, 40880 RATINGEN

Country:

GERMANY

declare the following apparatus:

Product name : Motherboard

Model name : F2A55-M LK2 PLUS, F2A55-M LK2

conform with the essential requirements of the following directives:

2004/108/EC-EMC Directive

EN 55022:2010

EN 61000-3-2:2006+A2:2009

EN 55013:2001+A1:2003+A2:2006

EN 55024:2010

EN 61000-3-3:2008

EN 55020:2007+A11:2011

1999/5/EC-R &TTE Directive

EN 300 328 V1.7.1(2006-10)

EN 300 440-1 V1.6.1(2010-08)

EN 300 440-2 V1.4.1(2010-08)

EN 301 511 V9.0.2(2003-03)

EN 301 908-1 V5.2.1(2011-05)

EN 301 908-2 V5.2.1(2011-07)

EN 301 893 V1.6.1(2011-11)

EN 302 544-2 V1.1.1(2009-01)

EN 302 623 V1.1.1(2009-01)

EN 300 330-1 V1.7.1(2010-02)

EN 300 330-2 V1.5.1(2010-02)

EN 50360:2001

EN 62479:2010

EN 301 489-1 V1.9.2(2011-09)

EN 301 489-3 V1.4.1(2002-08)

EN 301 489-4 V1.4.1(2009-05)

EN 301 489-7 V1.3.1(2005-11)

EN 301 489-9 V1.4.1(2007-11)

EN 301 489-17 V2.1.1(2009-05)

EN 301 489-24 V1.5.1(2010-09)

EN 302 326-2 V1.2.2(2007-06)

EN 302 326-3 V1.3.1(2007-09)

EN 301 357-2 V1.4.1(2008-11)

EN 50385:2002

EN 62311:2008

2006/95/EC-LVD Directive

EN 60950-1 / A11:2009

EN 60950-1 / A12:2011

EN 60065:2002 / A2:2010

EN 60065:2002 / A12:2011

2009/125/EC-ErP Directive

Regulation (EC) No. 1275/2008

Regulation (EC) No. 642/2009

Regulation (EC) No. 278/2009

2011/65/EU-RoHS Directive Ver. 121001

CE marking

Declaration Date: Nov. 21, 2012

Year to begin affixing CE marking:2012

Position : CEO

Name : Jerry Shen

Signature : __________

(EC conformity marking)

DECLARATION OF CONFORMITY

Per FCC Part 2 Section 2. 1077(a)

Responsible Party Name: Asus Computer International

Address: 800 Corporate Way, Fremont, CA 94539.

Phone/Fax No: [phone]/[phone]

hereby declares that the product

Product Name :Motherboard

Model Number :F2A55-M LK2 PLUS, F2A55-M LK2

Conforms to the following specifications:

FCC Part 15, Subpart B, Unintentional Radiators

Supplementary Information:

This device complies with part 15 of the FCC Rules. Operation is subject to

the following two conditions: (1) This device may not cause harmful

interference, and (2) this device must accept any interference received,

including interference that may cause undesired operation.

Representative Person’s Name : Steve Chang / President

Signature :

Date : Nov. 21, 2012

Ver. 120601

A-4

Appendices