Asus F2A55-M LK Specifications Page 1

MotherboardF2A55-M LK Series• F2A55-M LK • F2A55-M LK PLUS

xF2A55-M LK Series specications summarySpecications are subject to change without notice.ASUS unique featuresASUS DIGI+ VRMASUS 3+2 Phase Power Desi

xiPackage contentsCheck your motherboard package for the following items.F2A55-M LK PLUSPCIEX16PCIEX1_1PCIEX1_2PCI1USB910 USB78 USB56SPDIF_OUTALC887AA

xii

1.1 Special features1.1.1 Product highlightsAMD® A-series accelerated processors with AMD® Radeon™ HD 7000 series graphics This motherboard supports

1.1.2 ASUS DIGI+ VRMDIGI+POWER CONTROL: Digital Power Design for the APU*ASUS motherboards using the AMD® A55 chipset employ precise digital voltage

ASUS Anti-Surge ProtectionThis special design protects expensive devices and the motherboard from damage caused by power surges from switching power s

1.2 Before you proceedTake note of the following precautions before you install motherboard components or change any motherboard settings.• Unplug t

F2A55-M LK PLUS1.3 Motherboard overview1.3.1 Placement directionWhen installing the motherboard, ensure that you place it into the chassis in the co

1.3.3 Motherboard layoutF2A55-M LK PLUSPCIEX16PCIEX1_1PCIEX1_2PCI1USB910 USB78 USB56SPDIF_OUTALC887AAFPCPU_FANCHA_FANLithium CellCMOS PowerSuperI/OAU

1.4 Accelerated Processing Unit (APU)This motherboard comes with an FM2 socket designed for AMD® A-series accelerated processors with AMD® Radeon™ HD

iiE7617First EditionAugust 2012Copyright © 2012 ASUSTeK COMPUTER INC. All Rights Reserved.No part of this manual, including the products and software

1.4.1 APU installation1432Chapter 1: Product introduction1-8

1253 41.4.2 APU heatsink and fan assembly installationApply the Thermal Interface Material to the APU heatsink and APU before you install the heatsin

To uninstall the APU heatsink and fan assembly53142Chapter 1: Product introduction1-10

1.5 System memory1.5.1 OverviewThis motherboard comes with two Double Data Rate 3 (DDR3) Dual Inline Memory Modules (DIMM) sockets. A DDR3 module ha

1.5.2 Memory congurationsYou may install 1GB, 2GB, 4GB, and 8GB unbuffered non-ECC DDR3 DIMMs into the DIMM sockets.• You may install varying memor

DDR3 2200 (O.C.) MHz capability Vendors Part No. Size SS/DS Chip Brand Chip NO. Timing VoltageDIMM socket support (Optional)1 DIMM 2 DIMMsGEIL GET34GB

DDR3 1600 MHz capability Vendors Part No. SizeSS/DSChip BrandChip NO. Timing VoltageDIMM socket support (Optional)1 DIMM 2 DIMMsA-DATA AM2U16BC2P1 2GB

DDR3 1333 MHz capability Vendors Part No. SizeSS/DSChip Brand Chip NO. Timing VoltageDIMM socket support (Optional)1 DIMM 2 DIMMsA-DATA AD3U1333C2G9 2

Side(s): SS - Single-sided DS - Double-sidedDIMM support:• 1 DIMM: Supports one module inserted into any slot as Single-channel memory congurati

1.5.3 Installing a DIMM123To remove a DIMMBAAASUS F2A55-M LK Series1-17

iiiContentsSafety information ... viAbout this guid

1.6 Expansion slotsIn the future, you may need to install expansion cards. The following sub-sections describe the slots and the expansion cards that

IRQ assignments for this motherboardA B C D E F G HPCIEx16_1 – – shared – – – – –PCIEx1_1 shared – – – – – – –PCIEx1_2 – shared – – – – – –PCI1 slot –

1.7 Jumpers1. 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, ti

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)

1.8 Connectors1.8.1 Rear panel ports1. PS/2 Mouse port (green). This port is for a PS/2 mouse.2. LAN (RJ-45) port. This port allows Gigabit connec

6. USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are for USB 2.0/1.1 devices.7. USB 2.0 ports 3 and 4. These two 4-pin Uni

2. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)These connectors are for an ATX power supply. The plugs from the power supply are designed to 

3. Serial ATA 3.0 Gb/s connectors (7-pin SATA3G 1~6)These connectors are for the Serial ATA 3.0 Gb/s signal cables for Serial ATA hard disk drives an

5. System panel connector (10-1 pin PANEL)This connector supports several chassis-mounted functions.• System power LED (2-pin PLED)This 2-pin connec

7. Digital audio connector (4-1 pin SPDIF_OUT)This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port.The S/PDIF module is p

iv2.1.2 ASUS EZ Flash 2 ...2-22.1.3 ASUS CrashFree BIOS 3 utility ...

9. USB 2.0 connectors (10-1 pin USB56, USB78, USB910)These connectors are for USB 2.0 ports. Connect the USB module cable to any of these connectors,

1.9 Software support1.9.1 Installing an operating systemThis motherboard supports Windows® XP / Vista / Windows® 7 / Windows® 8 Operating Systems (O

Chapter 1: Product introduction1-30

Chapter 2: BIOS information 2-12.1 Managing and updating your BIOSSave a copy of the original motherboard BIOS le to a USB ash disk in case you nee

2-2 ASUS F2A55-M LK SeriesUpdating from the Internet a. Select Update BIOS from the Internet, then click Next. b. Select the ASUS FTP site nearest

Chapter 2: BIOS information 2-32.1.3 ASUS CrashFree BIOS 3 utilityThe ASUS CrashFree BIOS 3 is an auto recovery tool that allows you to restore the B

2-4 ASUS F2A55-M LK SeriesWelcome to FreeDOS (http://www.freedos.org)!C:\>d:D:\>3. When the Make Disk menu appears, select the FreeDOS command

Chapter 2: BIOS information 2-5Updating the BIOS leTo update the BIOS le using BIOS Updater1. At the FreeDOS prompt, type bupdater /pc /g and press

2-6 ASUS F2A55-M LK SeriesUsing the power button, reset button, or the <Ctrl>+<Alt>+<Del> keys to force reset from a running operati

Chapter 2: BIOS information 2-7EZ ModeBy default, the EZ Mode screen appears when you enter the BIOS setup program. The EZ Mode provides you an overvi

v2.7 Boot menu ... 2-252.7.1 Bootup NumLock State [O

2-8 ASUS F2A55-M LK SeriesAdvanced ModeThe Advanced Mode provides advanced options for experienced end-users to congure the BIOS settings. The gure

Chapter 2: BIOS information 2-9Menu itemsThe highlighted item on the menu bar displays the specic items for that menu. For example, selecting Main sh

2-10 ASUS F2A55-M LK Series2.3 Main menuThe Main menu screen appears when you enter the Advanced Mode of the BIOS Setup program. The Main menu provid

Chapter 2: BIOS information 2-11Administrator PasswordIf you have set an administrator password, we recommend that you enter the administrator passwor

2-12 ASUS F2A55-M LK Series2.4 Ai Tweaker menuThe Ai Tweaker menu items allow you to congure overclocking-related items.Be cautious when changing th

Chapter 2: BIOS information 2-13Target CPU Speed : xxxxMHzDisplays the current CPU speed.Target DRAM Speed : xxxxMHzDisplays the current DRAM speed.2.

2-14 ASUS F2A55-M LK Series2.4.6 GPU Boost [Auto][Auto] Automatic conguration.[Turbo Mode] Set to [Trubo Mode] to achieve better 3D performance.[E

Chapter 2: BIOS information 2-15VDDNB Offset Voltage [Auto]Allows you to set the VDDNB Offset voltage. The values range from 0.00625V to 0.500V with a

2-16 ASUS F2A55-M LK SeriesCPU Current Capability [100%]This item provides wider total power range for overclocking. A higher value brings a wider tot

Chapter 2: BIOS information 2-17Be cautious when changing the settings of the Advanced menu items. Incorrect eld values can cause the system to malfu

viSafety informationElectrical safetyTo prevent electrical shock hazard, disconnect the power cable from the electrical outlet before relocating the s

2-18 ASUS F2A55-M LK Series2.5.2 SATA CongurationWhile entering Setup, the BIOS automatically detects the presence of SATA devices. The SATA Port it

Chapter 2: BIOS information 2-192.5.3 USB CongurationThe items in this menu allow you to change the USB-related features.The USB Devices item shows

2-20 ASUS F2A55-M LK SeriesFront Panel Type [HD]Allows you to set the front panel audio connector (AAFP) mode to legacy AC’97 or high-denition audio

Chapter 2: BIOS information 2-212.5.6 APMRestore AC Power Loss [Power Off][Power On] The system goes into on state after an AC power loss.[Power Off

2-22 ASUS F2A55-M LK Series2.5.7 Network StackNetwork Stack [Disable Link]This item allows user to disable or enable the UEFI network stack. Congura

Chapter 2: BIOS information 2-232.6 Monitor menuThe Monitor menu displays the system temperature/power status, and allows you to change the fan setti

2-24 ASUS F2A55-M LK SeriesCPU Profile [Standard]This item appears only when you enable the CPU Q-Fan Control feature and allows you to set the approp

Chapter 2: BIOS information 2-252.7 Boot menuThe Boot menu items allow you to change the system boot options.2.7.1 Bootup NumLock State [On][On] Se

2-26 ASUS F2A55-M LK SeriesPost Report [5 sec]This item appears only when the Full Screen Logo item is set to [Disabled] and allows you to set the wai

Chapter 2: BIOS information 2-27The following four items appear only when you set Launch CSM to [Enabled].Boot Device Control [UEFI and Legacy OpROM]C

viiAbout this guideThis user guide contains the information you need when installing and conguring the motherboard.How this guide is organizedThis gu

2-28 ASUS F2A55-M LK SeriesManage All Factory Keys (PK, KEK, DB, DBX)Install default Secure Boot KeysConguration options: [Yes] [No]Platform Key (PK)

Chapter 2: BIOS information 2-292.7.10 Setup Mode [EZ Mode][Advanced Mode] Sets Advanced Mode as the default screen for entering the BIOS setup progr

2-30 ASUS F2A55-M LK Series2.8 Tools menuThe Tools menu items allow you to congure options for special functions. Select an item then press <Ente

Chapter 2: BIOS information 2-312.9 Exit menuThe Exit menu items allow you to load the optimal default values for the BIOS items, and save or discard

2-32 ASUS F2A55-M LK Series

ASUS F2A55-M LK SeriesA-1AppendicesNoticesFederal Communications Commission StatementThis device complies with Part 15 of the FCC Rules. Operation is

A-2AppendicesCanadian Department of Communications StatementThis digital apparatus does not exceed the Class B limits for radio noise emissions from d

ASUS F2A55-M LK SeriesA-3ASUS contact informationASUSTeK COMPUTER INC.Address 15 Li-Te Road, Peitou, Taipei, Taiwan 11259Telephone +886-2-2894-

A-4AppendicesDECLARATION OF CONFORMITYPer FCC Part 2 Section 2. 1077(a) Responsible Party Name: Asus Computer International Address: 800 Corpora

viiiConventions used in this guideTo ensure that you perform certain tasks properly, take note of the following symbols used throughout this manual.DA

ix(continued on the next page)F2A55-M LK Series specications summaryAPU FM2 socket for AMD® A-Series accelerated processors (APU) with AMD Radeon™ HD