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Product warranty or service will not be extended if: (1) the product is repaired, modified or altered, unless such repair, modification of alteration is authorized in writing by ASUS; or (2) the serial number of the product is defaced or missing.
Contents Safety information ...................... vi About this guide ......................vii F2A55-M LK2 Series specifications summary ............ix Package contents ....................... xi Product introduction Special features .................... 1-1 1.1.1 Product highlights ................1-1 1.1.2 ASUS DIGI+ VRM ................1-2 1.1.3 ASUS Exclusive Features ............... 1-2 Before you proceed ..................
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Managing and updating your BIOS ............. 2-1 2.1.1 ASUS Update utility ................ 2-1 2.1.2 ASUS EZ Flash 2 ................2-2 2.1.3 ASUS CrashFree BIOS 3 utility ............2-3 2.1.4 ASUS BIOS Updater ............... 2-4 BIOS setup program ..................2-6 Main menu ....................2-10 2.3.1 System Language [English] ............
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2.7.10 Boot Option Priorities ..............2-29 2.7.11 Boot Override ................2-29 Tools menu ....................2-30 2.8.1 ASUS EZ Flash 2 Utility ..............2-30 2.8.2 ASUS SPD Information ..............2-30 2.8.3 ASUS O.C. Profile ................. 2-30 Exit menu ....................2-31 Appendices Notices ........................
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.
Refer to the following sources for additional information and for product and software updates. ASUS websites The ASUS website provides updated information on ASUS hardware and software products. Refer to the ASUS contact information. Optional documentation Your product package may include optional documentation, such as warranty flyers, that may have been added by your dealer.
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 .
Supports AMD Memory Profile (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 (Qualified Vendors List).
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ASUS Fan Xpert ASUS CrashFree BIOS 3 ASUS EZ Flash 2 ASUS MyLogo 2™ Special features 100% All high quality conductive polymer (F2A55-M LK2 PLUS only) Back Panel I/O 1 x PS/2 mouse port (green) ports 1 x PS/2 keyboard port (purple)
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 onboard LAN controller is a highly integrated Gb LAN controller. It is enhanced with an ACPI management function to provide efficient power management for advanced operating systems. 100% All High-quality Conductive Polymer Capacitors (F2A55-M LK2 PLUS only) This motherboard uses all high-quality conductive polymer capacitors for durability, improved lifespan, and enhanced thermal capacity.
Engineered and tested to assure unmitigated performance, ASUS A55 boards with DIGI+ VRM remain efficient and accurate, for reliable application in every scenario.
ASUS EZ Flash 2 ASUS EZ Flash 2 is a user-friendly utility that allows you to update the BIOS without using a bootable floppy disk or an OS-based utility. ASUS MyLogo2™...
The illustration below shows the location of the onboard LED. SB_PWR F2A55-M LK2 PLUS Standby Power Powered Off F2A55-M LK2 PLUS Onboard LED Chapter 1: Product introduction...
Place six screws into the holes indicated by circles to secure the motherboard to the chassis. DO NOT overtighten the screws! Doing so can damage the motherboard. Place this side towards the rear of the chassis. F2A55-M LK2 PLUS ASUS F2A55-M LK2 Series...
1.3.3 Motherboard layout 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. 17.3cm(6.8in) KBMS ATX12V CPU_FAN DIGI +VRM...
Ensure that you use a APU designed for the FM2 socket. The APU fits in only one correct orientation. DO NOT force the APU into the socket to prevent bending the pins and damaging the APU! F2A55-M LK2 PLUS F2A55-M LK2 PLUS CPU socket FM2 ASUS F2A55-M LK2 Series...
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 ASUS F2A55-M LK2 Series...
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To uninstall the APU heatsink and fan assembly Chapter 1: Product introduction 1-10...
DDR2 DIMM socket. DDR3 modules are developed for better performance with less power consumption. The figure illustrates the location of the DDR3 DIMM sockets: Channel Sockets Channel A DIMM_A1 F2A55-M LK2 PLUS Channel B DIMM_B1 F2A55-M LK2 PLUS 240-pin DDR3 DIMM sockets ASUS F2A55-M LK2 Series 1-11...
• 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.
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1 DIMM: Supports one module inserted into any slot as Single-channel memory configuration. • 2 DIMMs: Supports two modules inserted into both the blue slots as one pair of Dual- channel memory configuration. Visit the ASUS website at www.asus.com for the latest QVL. ASUS F2A55-M LK2 Series 1-15...
This motherboard supports PCI Express x1 network cards, SCSI cards, and other cards that comply with the PCI Express specifications. 1.6.5 PCI Express x16 slot This motherboard supports one PCI Express x16 graphics card that complies with the PCI Express specifications. ASUS F2A55-M LK2 Series 1-17...
Normal Clear RTC (Default) F2A55-M LK2 PLUS Clear RTC RAM To erase the RTC RAM: Turn OFF the computer and unplug the power cord. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3 for about 5~10 seconds, then move the cap back to pins 1-2.
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F2A55-M LK2 PLUS +5VSB (Default) F2A55-M LK2 PLUS USB Device Wake Up • The USB device wake-up feature requires a power supply that can provide 500mA on the +5VSB lead for each USB port; otherwise, the system would not power up.
Mic In Bass/Center Bass/Center Lime (Front panel) — — — Side Speaker Out To configure an 8-channel audio output: Use a chassis with HD audio module in the front panel to support an 8-channel audio output. ASUS F2A55-M LK2 Series 1-21...
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. Chapter 1: Product introduction 1-22...
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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...
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SATA3G_3 SATA3G_4 F2A55-M LK2 PLUS F2A55-M LK2 PLUS SATA 3.0Gb/s connectors • These connectors are set to AHCI mode by default. If you intend to create a Serial ATA RAID set using these connectors, set the type of the SATA connectors in the BIOS to [RAID].
PIN 1 F2A55-M LK2 PLUS HD_LED RESET F2A55-M LK2 PLUS System panel connector • System power LED (2-pin PLED) This 2-pin connector is for the system power LED. Connect the chassis power LED cable to this connector. The system power LED lights up when you turn on the system power, and blinks when the system is in sleep mode.
F2A55-M LK2 PLUS HD-audio-compliant Legacy AC’97 pin definition compliant definition F2A55-M LK2 PLUS Front panel audio connector • We recommend that you connect a high-definition front panel audio module to this connector to avail of the motherboard high-definition audio capability. •...
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COM1 PIN 1 F2A55-M LK2 PLUS F2A55-M LK2 PLUS Serial port (COM1) connector The COM module is purchased separately. ASUS F2A55-M LK2 Series 1-27...
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.
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. ®...
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 file from the ASUS website at www.asus.com.
2.1.3 ASUS CrashFree BIOS 3 utility The ASUS CrashFree BIOS 3 is an auto recovery tool that allows you to restore the BIOS file when it fails or gets corrupted during the updating process. You can restore a corrupted BIOS file using the motherboard support DVD or a USB flash drive that contains the updated BIOS file.
2.1.4 ASUS BIOS Updater The ASUS BIOS Updater allows you to update BIOS in DOS environment. This utility also allows you to copy the current BIOS file that you can use as a backup when the BIOS fails or gets corrupted during the updating process.
At the FreeDOS prompt, type bupdater /pc /g and press <Enter>. D:\>bupdater /pc /g The BIOS Updater screen appears as below. ASUSTek BIOS Updater for DOS V1.30 Current ROM Update ROM BOARD: F2A55-M LK2 PLUS BOARD: Unknown VER: 0201 VER: Unknown...
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. ASUS F2A55-M LK2 Series...
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Advanced Mode Power Saving mode Loads optimized default Selects the Advanced mode functions Normal mode ASUS Optimal mode Selects the boot Selects the boot device priority device priority Displays the system properties of the selected mode on the right hand side Displays the Advanced mode menus •...
The Advanced Mode provides advanced options for experienced end-users to configure the BIOS settings. The figure below shows an example of the Advanced Mode. Refer to the following sections for the detailed configurations. To access the EZ Mode, click Exit, then select ASUS EZ Mode. Back button Menu items...
Menu items The highlighted item on the menu bar displays the specific items for that menu. For example, selecting Main shows the Main menu items. The other items (Ai Tweaker, Advanced, Monitor, Boot, Tool, and Exit) on the menu bar have their respective menu items.
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 fields in the BIOS setup program. To set an administrator password: Select the Administrator Password item and press <Enter>.
Be cautious when changing the settings of the Ai Tweaker menu items. Incorrect field values can cause the system to malfunction. The configuration options for this section vary depending on the CPU and DIMM model you installed on the motherboard. 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 configuration options: [Auto] Loads the optimal settings for the system.
• 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...
Reducing phase number under light system loading to increase VRM efficiency. [Standard] Proceeds phase control depending on the CPU loading. [Optimized] Loads the ASUS optimized phase tuning profile. [Extreme] Proceeds the full phase mode. [Manual Adjustment] Allows manual adjustment.
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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...
Advanced menu The Advanced menu items allow you to change the settings for the CPU and other system devices. Be cautious when changing the settings of the Advanced menu items. Incorrect field values can cause the system to malfunction. 2.5.1 CPU Configuration The items in this menu show the CPU-related information that the BIOS automatically detects.
S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology) is a monitor system. When read/write of your hard disk errors occur, this feature allows the hard disk to report warning messages during the POST. Configuration options: [Enabled] [Disabled] 2-18 ASUS F2A55-M LK2 Series...
2.5.3 USB Configuration The items in this menu allow you to change the USB-related features. The USB Devices item shows the auto-detected values. If no USB device is detected, the item shows None. USB Device Enable [Enabled] [Enabled] Enables available USB devices. [Disabled] Disables available USB devices.
Allows you to enable or disable the serial port (COM). Configuration options: [Enabled] [Disabled] Change Settings [Auto] Allows you to select the Serial Port base address. Configuration options: [Auto] [IO=3F8h; IRQ=4] [IO=2F8h; IRQ=3] [IO=3E8h; IRQ=4] [IO=2E8h; IRQ=3] 2-20 ASUS F2A55-M LK2 Series...
2.5.6 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 before the AC power loss.
Ipv6 PXE Support [Enabled] This item appears only when you set the Network Stack item to [Enabled]. When this item is disabled, the IPV6 PXE boot option will not be created. Configuration options: [Disable Link] [Enabled] 2-22 ASUS F2A55-M LK2 Series...
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]...
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. Configuration options: [Auto] [Disabled] [Enabled] 2-24 ASUS F2A55-M LK2 Series...
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...
[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.
2.7.3 Post Delay Time [3 sec] Allows you to set the POST Report wait time. This configuration only functions in Normal Boot mode. Configuration options: [0 sec] [1 sec] [2 sec] [3 sec] [4 sec] [5 sec] [6 sec] [7 sec] [8 sec] [9 sec] [10 sec] 2.7.4 Bootup NumLock State [On]...
<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...
This option allows you to exit the Setup program without saving your changes. When you select this option or if you press <Esc>, a confirmation window appears. Select Yes to discard changes and exit. ASUS EZ Mode This option allows you to enter the EZ Mode screen. Launch EFI Shell from filesystem device This option allows you to attempt to launch the UEFI Shell application (shellx64.efi) from one...
: (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...
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.
+1-812-282-3777 +1-510-608-4555 Web site usa.asus.com Technical Support Telephone +1-812-282-2787 Support fax +1-812-284-0883 Online support support.asus.com ASUS COMPUTER GmbH (Germany and Austria) Address Harkort Str. 21-23, D-40880 Ratingen, Germany +49-2102-959911 Web site www.asus.de Online contact www.asus.de/sales Technical Support Telephone +49-1805-010923* Support Fax...