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  P7H55…
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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.

• Page 3: Table Of Contents

  Contents Notices ………………….vi Safety information ………………vii About this guide ………………vii P7H55 specifications summary …………..ix Chapter 1: Product introduction Welcome! ………………1-1 Package contents …………….. 1-1 Special features …………….1-1 1.3.1 Product highlights …………1-1 1.3.2 Innovative ASUS features ……….1-2 Before you proceed …………..

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  Chapter 2: BIOS information 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 ……….. 2-3 2.1.4 ASUS BIOS Updater …………2-3 BIOS setup program …………..2-6 2.2.1…
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  Boot Settings Configuration ………. 2-24 2.7.3 Security …………….. 2-24 Tools menu …………….. 2-25 2.8.1 ASUS O.C. Profile …………2-26 2.8.2 AI NET 2……………. 2-26 2.8.3 ASUS EZ Flash 2 …………2-26 2.8.4 Express Gate …………… 2-26 Exit menu ………………2-27…

• Page 6: Notices

  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://green.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.

• Page 7: Safety Information

  Safety information Electrical safety • To prevent electric shock hazard, disconnect the power cable from the electric 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.

• Page 8: Conventions Used In This Guide

  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.

• Page 9: P7H55 Specifications Summary

  ** Hyper DIMM support is subject to the physical characteristics of individual CPUs. Some hyper DIMMs only support one DIMM per channel. *** Refer to www.asus.com for the latest Memory QVL (Qualified Vendors List). **** When you install a total memory of 4GB or more,…

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  ASUS Exclusive Features: — MemOK! — ASUS EPU — Express Gate ASUS Quiet Thermal Solution: — ASUS Fanless Design: Stylish Heatsink Solution, MOS Heatsink — ASUS Fan Xpert ASUS EZ DIY: — ASUS O.C. Profile — ASUS CrashFree BIOS 3…
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  BIOS 16 Mb Flash ROM, AMI BIOS, PnP, DMI 2.0, WfM 2.0, SM BIOS 2.5, ACPI 2.0a, Multi-language BIOS, ASUS EZ Flash 2, ASUS CrashFree BIOS 3 Manageability WfM 2.0, DMI 2.0, WOL by PME, WOR by PME, PXE Accessories 1 x Ultra DMA 133/100 cable 2 x Serial ATA 3.0Gb/s cables…

• Page 12: Chapter 1: Product Introduction

  ® The motherboard delivers a host of new features and latest technologies, making it another standout in the long line of ASUS quality motherboards! Before you start installing the motherboard, and hardware devices on it, check the items in your package with the list below.

• Page 13: Innovative Asus Features

  1.3.2 Innovative ASUS features Turbo Key ASUS Turbo Key allows you to turn the PC power button into a physical overclocking button. After the easy setup, Turbo Key can boost performances without interrupting ongoing work or games—with just one touch!

• Page 14: Asus Epu

  Internet and key applications before entering the Windows ® • ASUS Express Gate supports installation on SATA HDDs, USB HDDs and flash drives with at least 1.2GB free disk space. When installing it on USB HDDs or flash drives, connect the drives to the motherboard USB port before turning on the computer.

• Page 15: Asus Mylogo2

  BIOS file using the bundled support DVD or USB flash disk that contains the latest BIOS file. ASUS EZ Flash 2 ASUS EZ Flash 2 is a utility that allows you to update the BIOS without using an OS-based utility. ASUS AI NET2…

• Page 16: Before You Proceed

  ON, in sleep mode, or in soft-off mode. This is a reminder that you must shut down the system and unplug the power cable before removing or plugging in any motherboard component. The illustration below shows the location of the onboard LED. SB_PWR P7H55 Standby Power Powered Off P7H55 Onboard LED Chapter 1: Product introduction…

• Page 17: Motherboard Overview

  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 P7H55 ASUS P7H55…

• Page 18: Motherboard Layout

  CPU_FAN PWR_FAN ATX12V MemOK! USB78 SPDIF_O2 USB56 LGA1156 USB34 LAN_USB12 CHA_FAN AUDIO PRI_IDE PCIEX1_1 VT6415 Realtek 8112L PCIEX16 PCIEX1_2 COM1 P7H55 PCIEX1_3 Intel ® Super PCI1 Lithium Cell CMOS Power PCI2 SATA4 SATA5 SATA6 VT1708S BIOS PCI3 USBPW9-12 SB_PWR CLRTC AAFP…

• Page 19: Central Processing Unit (Cpu)

  Contact your retailer immediately if the PnP cap is missing, or if you see any damage to the PnP cap/socket contacts/motherboard components. ASUS will shoulder the cost of repair only if the damage is shipment/transit-related. • Keep the cap after installing the motherboard. ASUS will process Return Merchandise Authorization (RMA) requests only if the motherboard comes with the cap on the LGA1156 socket.

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  Lift the load lever in the direction of the arrow until the load plate is completely lifted. Load plate Remove the PnP cap from the CPU socket by lifting the tab only. PnP cap Cap tab Position the CPU over the socket, ensuring that the gold triangle is on the bottom-left corner of the socket, and CPU notches…
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  Close the load plate (A), and then push down the load lever (B), ensuring that the front edge of the load plate slides under the retention knob (C). Insert the load lever under the retention tab. ASUS P7H55 1-10…

• Page 22: Installing The Cpu Heatsink And Fan

  1.6.2 Installing the CPU heatsink and fan The Intel LGA1156 processor requires a specially designed heatsink and fan assembly to ® ensure optimum thermal condition and performance. • When you buy a boxed Intel processor, the package includes the CPU fan and ®…

• Page 23: Uninstalling The Cpu Heatsink And Fan

  Connect the CPU fan cable to the connector on the motherboard labeled CPU_FAN. CPU_FAN P7H55 P7H55 CPU fan connector Do not forget to connect the CPU fan connector! Hardware monitoring errors can occur if you fail to plug this connector.

• Page 24: System Memory

  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 and DIMM_A2 Channel B DIMM_B1 and DIMM_B2 P7H55 P7H55 240-pin DDR3 DIMM sockets 1-13 Chapter 1: Product introduction…

• Page 25: Memory Configurations

  • Hyper DIMM support is subject to the physical characteristics of individual CPUs. • According to Intel spec definition, DDR3 1600+ is supported for one DIMM per channel only. ASUS exclusively provides two DDR3 1600+ DIMM support for each memory channel.

• Page 26: Installing A Dimm

  1.7.3 Installing a DIMM Ensure to unplug the power supply before adding or removing DIMMs or other system components. Failure to do so may cause severe damage to both the motherboard and the components. DIMM notch To install a DIMM Unlock a DIMM socket by pressing the retaining clip outward.

• Page 27: Expansion Slots

  PCI Express x16 slot This motherboard has a PCI Express 2.0 x16 slot that supports PCI Express x16 2.0 graphic cards complying with the PCI Express specifications. Refer to section 1.5.3 Motherboard layout for the location of the expansion slots. ASUS P7H55 1-16…

• Page 28: Jumpers

  Normal Clear RTC (Default) P7H55 Clear RTC RAM 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.

• Page 29: Keyboard Power

  P7H55 +5VSB (Default) P7H55 USB Device Wake Up • The USB device wake-up feature requires a power supply that can provide 500mA on the +5VSB lead for each USB port; otherwise, the system would not power up. • The total current consumed must NOT exceed the power supply capability (+5VSB) whether under normal condition or in sleep mode.

• Page 30: Memok! Switch

  • If the installed DIMMs still fail to boot after the whole tuning process, the DRAM_LED lights continuously. Replace the DIMMs with ones recommended in the Memory QVL (Qualified Vendors Lists) in this user manual or on the ASUS website at www.asus.com.

• Page 31: Connectors

  Side Speaker Out port (gray). This port connects the side speaker in an 8-channel audio configuration. Refer to the audio configuration table on the next page for the function of the audio ports in 2, 4, 6, or 8-channel configuration. ASUS P7H55 1-20…

• Page 32: Internal Connectors

  Legacy AC’97 pin definition compliant definition P7H55 Analog front panel connector • We recommend that you connect a high-definition front panel audio module to this connector to avail of the motherboard’s high-definition audio capability. • If you want to connect a high-definition front panel audio module to this connector, set the Front Panel Type item in the BIOS setup to [HD Audio].

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  If any device jumper is set as “Cable-Select,” ensure that all other device jumpers have the same setting. Optical drive audio connector (4-pin CD) These connectors allow you to receive stereo audio input from sound sources such as a CD-ROM, TV tuner, or MPEG card. P7H55 P7H55 Internal audio connector ASUS P7H55 1-22…
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  • DO NOT forget to connect the 4-pin ATX +12V power plug. Otherwise, the system will not boot up. • 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. USB connectors (10-1 pin USB910, USB1112) These connectors are for USB 2.0 ports.
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  These are not jumpers! Do not place jumper caps on the fan connectors! • Only the 4-pin CPU fan supports the ASUS Q-FAN feature. • The CPU_FAN connector supports a CPU fan of maximum 2A (24 W) fan power.
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  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. COM1 PIN 1 P7H55 P7H55 Serial port (COM1) connector The COM module is purchased separately. 1-25 Chapter 1: Product introduction…

• Page 37: System Panel Connector

  IDE_LED PWRSW RESET * Requires an ATX power supply P7H55 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.

• Page 38: Software Support

  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 to the optical drive.

• Page 39: Chapter 2: Bios Information

  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. ®…

• Page 40: Asus Ez Flash 2

  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.

• Page 41: Asus Crashfree Bios

  2.1.3 ASUS CrashFree BIOS The ASUS CrashFree BIOS 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 removable device that contains the updated BIOS file.

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  Insert the USB flash drive with the latest BIOS file and BIOS Updater to the USB port. Boot your computer. When the ASUS Logo appears, press <F8> to show the BIOS Boot Device Select Menu. Insert the support DVD into the optical drive and select the optical drive as the boot device.

• Page 43: Updating The Bios File

  ASUSTek BIOS Updater for DOS V1.00b [09/06/22] FLASH TYPE: MXIC 25L1605A Current ROM Update ROM BOARD: P7H55 BOARD: Unknown VER: 0302 VER: Unknown DATE: 12/28/2009 DATE: Unknown PATH: BIOS backup is done! Press any key to continue. Note Saving BIOS:…

• Page 44: Bios Setup Program

  • The BIOS setup screens shown in this section are for reference purposes only, and may not exactly match what you see on your screen. • Visit the ASUS website at www.asus.com to download the latest BIOS file for this motherboard.

• Page 45: Bios Menu Screen

  2.2.1 BIOS menu screen Menu items Menu bar Configuration fields General help BIOS SETUP UTILITY Main Ai Tweaker Advanced Power Boot Tools Exit Use [ENTER], [TAB] or System Time [12:56:38] [SHIFT-TAB] to select System Date [Thu 07/09/2009] a field. Language [English] Use [+] or [-] to SATA1…

• Page 46: Submenu Items

  :[Not Detected] SATA5 :[Not Detected] SATA6 :[Not Detected] Select Screen Storage Configuration Select Item System Information Change Field Select Field General Help Save and Exit Exit v02.61 (C)Copyright 1985-2009, American Megatrends, Inc. v02.61 (C)Copyright 1985-2009, American Megatrends, Inc. ASUS P7H55…

• Page 47: System Time

  2.3.1 System Time [xx:xx:xx] Allows you to set the system time. 2.3.2 System Date [Day xx/xx/xxxx] Allows you to set the system date. 2.3.3 SATA1~6 While entering Setup, the BIOS automatically detects the presence of SATA devices. There is a separate submenu for each SATA device. Select a device item then press <Enter> to display the SATA device information.

• Page 48: System Information

  This menu gives you an overview of the general system specifications. The BIOS automatically detects the items in this menu. BIOS Information Displays the auto-detected BIOS information Processor Displays the auto-detected CPU specification System Memory Displays the auto-detected system memory 2-10 ASUS P7H55…

• Page 49: Ai Tweaker Menu

  Ai Tweaker menu The Ai Tweaker menu items allow you to configure overclocking-related items. Be cautious when changing the settings of the Ai Tweaker menu items. Incorrect field values can cause the system to malfunction. The configuration options for this chapter vary depending on the CPU and DIMM model you installed on the motherboard.

• Page 50: Xtreme Phase Full Power Mode

  D.O.C.P. D.O.C.P. • When using DIMMs with afrequency higher than the Intel CPU spec, use this ASUS ® exclusive DRAM O.C. Profile function to overclock the DRAM. • Adjust BCLK frequency to obtain a better performance after applying the D.O.C.P.

• Page 51: Dram Timing Control

  The following two items appear only when you set the Ai Overclock Tuner item to [Manual], [D.O.C.P.] or [X.M.P.]. BCLK Frequency [XXX] Allows you to adjust the Internal Base Clock (BCLK). Use the <+> and <-> keys to adjust the value.

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  Configuration options: [Auto] [2 DRAM Clock] – [14 DRAM Clock] DRAM READ to WRITE Delay(SR) [Auto] Configuration options: [Auto] [2 DRAM Clock] – [14 DRAM Clock] DRAM READ to READ Delay(DD) [Auto] Configuration options: [Auto] [2 DRAM Clock] – [9 DRAM Clock] 2-14 ASUS P7H55…
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  DRAM READ to READ Delay(DR) [Auto] Configuration options: [Auto] [2 DRAM Clock] – [9 DRAM Clock] DRAM READ to READ Delay(SR) [Auto] Configuration options: [Auto] [4 DRAM Clock] [6 DRAM Clock] DRAM WRITE to WRITE Delay(DD) [Auto] Configuration options: [Auto] [2 DRAM Clock] – [9 DRAM Clock] DRAM WRITE to WRITE Delay(DR) [Auto] Configuration options: [Auto] [2 DRAM Clock] –…
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  1.65V. Load-Line Calibration [Auto] [Auto] Automatic configuration. [Disabled] Follow Intel specifications. [Enabled] Improve CPU VDroop directly. PCIE Spread Spectrum [Disabled] [Auto] Automatic configuration. [Disabled] Enhances the PCIE overclocking ability. [Enabled] Sets to [Enabled] for EMI control. 2-16 ASUS P7H55…

• Page 55: Advanced Menu

  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. BIOS SETUP UTILITY Main Ai Tweaker Advanced…

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  This item appears only when you set the Intel(R) C-STATE Tech item to [Enabled]. We recommend that you set this item to [Auto] for BIOS to automatically detect the C-State mode supported by your CPU. Configuration options: [Auto] [C1] [C3] [C6] 2-18 ASUS P7H55…

• Page 57: Uncore Configuration

  2.5.2 Uncore Configuration The North Bridge Configuration menu allows you to change the advanced chipset settings. Memory Remap Feature [Enabled] [Disabled] Do not allow remapping of memory. [Enabled] Allows for the segment of system memory that was previously overwritten by PCI devices to be remapped above the total physical memory.

• Page 58: Pcipnp

  [Auto] used for System ACPI 2.0 Support [Enabled] Suspend. ACPI APIC Support [Enabled] APM Configuration Hardware Monitor Select Screen ←→ Select Item ↑↓ Change Option General Help Save and Exit Exit v02.61 (C)Copyright 1985-2009, American Megatrends, Inc. 2-20 ASUS P7H55…

• Page 59: Suspend Mode

  2.6.1 Suspend Mode [Auto] Allows you to select the Advanced Configuration and Power Interface (ACPI) state to be used for system suspend. [S1 (POS) only] Sets the APCI suspend mode to S1/POS (Power On Suspend). [S3 only] Sets the APCI suspend mode to S3/STR (Suspend To RAM). [Auto] The system automatically configures the ACPI suspend mode.

• Page 60: Hardware Monitor

  Sets to [Silent] to minimize the fan speed for quiet CPU fan operation. [Turbo] Set to [Turbo] to achieve maximum CPU fan speed. Chassis Q-Fan Control [Disabled] [Disabled] Disables the Chassis Q-Fan control feature. [Enabled] Enables the Chassis Q-Fan control feature. 2-22 ASUS P7H55…

• Page 61: Boot Menu

  Configuration options: [Removable Dev.] [Hard Drive] [ATAPI CD-ROM] [Disabled] • To select the boot device during system startup, press <F8> when ASUS Logo appears. • To access Windows OS in Safe Mode, do any of the following: ®…

• Page 62: Boot Settings Configuration

  Enables or disables the full screen logo display feature. Configuration options: [Disabled] [Enabled] Set this item to [Enabled] to use the ASUS MyLogo2™ feature. AddOn ROM Display Mode [Force BIOS] Sets the display mode for option ROM. Configuration options: [Force BIOS] [Keep Current] Bootup Num-Lock [On] Selects the power-on state for the NumLock.

• Page 63: Tools Menu

  BIOS SETUP UTILITY Main Ai Tweaker Advanced Power Boot Tools Exit Tools Settings ASUS O.C. Profile AI NET 2 ASUS EZ Flash 2 Express Gate [Auto] Enter OS Timer [10 Seconds] Reset User Data [No] Chapter 2: BIOS information 2-25…

• Page 64: Asus O.c. Profile

  2.8.3 ASUS EZ Flash 2 Allows you to run ASUS EZ Flash 2. When you press <OK>, a confirmation message appears. Use the left/right arrow key to select between [Yes] or [No], then press <OK> to confirm your choice. See section 2.1.2 ASUS EZ Flash 2 for details.

• Page 65: Exit Menu

  enter the Express Gate. User data includes the Express Gate’s settings as well as any personal information stored by the web browser such as bookmarks, cookies, browsing history. This is useful in the rare case where corrupt settings prevent the Express Gate environment from launching properly.

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  2-28 ASUS P7H55…