Asus M4A785-M User Manual Page 1

MotherboardM4A785-M

xM4A785-M specications summary(continued on the next page)CPU AMD® Phenom™ II / Athlon™ II / Phenom™ / Athlon™ / Sempron™ family processors (AM3 /

xiM4A785-M specications summaryStorage 1 x Ultra DMA 133/100/66 connector for up to 2 PATA devices 6 x Serial ATA 3Gb/s connectors support RAID 0, RA

xii* Specications are subject to change without notice. M4A785-M specications summaryInternal I/O connectors 3 x USB 2.0/1.1 connectors support add

1.2 Package contentsCheck your motherboard package for the following items.Motherboard ASUS M4A785-M motherboardCables 2 x Serial ATA cables 1 x

AMD® Phenom™ X4 / Phenom™ X3 / Athlon™ X2 / Athlon™ / Sempron™ processors (socket AM2+/AM2)This motherboard supports AMD® Socket AM2+ multi-c

Serial ATA 3Gb/s technologyThis motherboard supports hard drives based on the Serial ATA (SATA) 3Gb/s storage specications, delivering enhanced salab

ASUS CrashFree BIOS 3ASUS CrashFree BIOS 3 is an auto-recovery tool that allows you to restore a corrupted BIOS le using the bundled support DVD or a

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

1.5 Motherboard overview1.5.1 Placement directionWhen installing the motherboard, ensure that you place it into the chassis in the correct orientati

1.5.3 Motherboard layout1.5.4 Layout contentsConnectors/Jumpers/Slots/LED Page Connectors/Jumpers/Slots/LED Page1. CPU and chassis fan connectors

iiCopyright © 2009 ASUSTeK Computer Inc. All Rights Reserved.No part of this manual, including the products and software described in it, may be repro

1.6 Central Processing Unit (CPU)The motherboard comes with an AM2+/AM2 socket designed for Phenom™ II / Athlon™ II / Phenom™ / Athlon™/ Sempron™ fam

5. When the CPU is in place, push down the socket lever to secure the CPU. The lever clicks on the side tab to indicate that it is locked.6. Install

1.6.2 Installing the heatsink and fanEnsure that you use only AMD-certied heatsink and fan assembly.To install the CPU heatsink and fan:1. Place th

3. Align the other end of the retention bracket to the retention module base. A clicking sound denotes that the retention bracket is in place.Ensure

1.7.2 Memory congurationsYou may install 512MB, 1GB, 2GB, and 4GB unbuffered ECC and non-ECC DDR2 DIMMs into the DIMM sockets.• You may install var

(continued on the next page)Size Vendor Part No.Chip BrandChip NO. CLDIMM supportA* B* C*4096MB(kit of 2) G.SKILL F2-8500CL5D-4GBPK DS N/A Heat-Sink P

Size Vendor Part No.SS/DSChip BrandChip NO. CLDIMM support A* B* C*1024MB GEIL GE24GB800C4QC DS GEIL Heat-Sink Package 4 • • •1024MB GEIL GE24GB800C5Q

Size Vendor Part No.SS/DSChip BrandChip NO. CLDIMM support A* B* C*1024MB TranscendJM800QLU-1G SS Transced TQ1243PCF8 5 • •1024MB TranscendTS128MLQ64V

SS: Single-sided / DS: Double-sided DIMM support: • A*: Supports one module inserted into any slot as single-channel memory conguration. • B*: Supp

1.7.3 Installing a DIMMUnplug the power supply before adding or removing DIMMs or other system components. Failure to do so can cause severe damage t

iiiContentsNotices ... viSafety information ...

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

1.9 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

1.10 Connectors1.10.1 Rear panel ports1. PS/2 Keyboard/Mouse Combo port (purple). This port is for a PS/2 keyboard or mouse.2. Optical S/PDIF_OUT

Refer to the audio conguration table below for the function of the audio ports in the 2, 4, 6, or 8-channel conguration.11. USB 2.0 ports 1 and 2.

Playback of HD DVD and Blu-ray discs• For better playback quality, we recommend that you follow the system requirements listed below. Suggested listC

1.10.2 Internal connectors1. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)These connectors are for an ATX power supply. The plugs from the pow

2. IDE connector (40-1 pin PRI_IDE)The onboard IDE connector is for Ultra DMA 133/100/66 signal cable. There are three connectors on each Ultra DMA 1

3. Serial ATA connectors (7-pin SATA1-6)These connectors are for the Serial ATA signal cables for Serial ATA 3Gb/s hard disk and optical disk drives.

4. System panel connector (20-8 pin PANEL)This connector supports several chassis-mounted functions.• System power LED (2-pin PLED)This 2-pin connec

5. USB connectors (10-1 pin USB78, USB910, USB1112)These connectors are for USB 2.0 ports. Connect the USB module cable to any of these connectors, t

ivContents1.11 Software support ... 1-301.11.1 Installing an operating system .

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

9. CPU and chassis fan connectors (4-pin CPU_FAN and 3-pin CHA_FAN)The fan connectors support cooling fans of 350mA~740mA (8.88W max.) or a total of

1.11 Software support1.11.1 Installing an operating systemThis motherboard supports Windows® XP/Vista Operating Systems (OS). Always install the lat

ASUS M4A785-M 2-1 Chapter 2 BIOS information2.1 Managing and updating your BIOSSave a copy of the original motherboard BIOS le to a USB ash disk

2-2 Chapter 2: BIOS informationUpdating from a BIOS file a. Select Update BIOS from a le, then click Next. b. Locate the BIOS le from the Open w

ASUS M4A785-M 2-3• This function supports USB ash disks with FAT 32/16 format and single partition only.• DO NOT shut down or reset the system whi

2-4 Chapter 2: BIOS information2.2 BIOS setup programUse the BIOS Setup program to update the BIOS or congure its parameters. The BIOS screens inclu

ASUS M4A785-M 2-52.2.1 BIOS menu screen2.2.2 Menu barThe menu bar on top of the screen has the following main items:Main For changing the basi

2-6 Chapter 2: BIOS information2.2.4 Menu itemsThe highlighted item on the menu bar displays the specic items for that menu. For example, selecting

ASUS M4A785-M 2-72.3 Main menuWhen you enter the BIOS Setup program, the Main menu screen appears, giving you an overview of the basic system inform

vContents2.5.3 ACPI APIC Support ... 2-162.5.4 APM Conguration ...

2-8 Chapter 2: BIOS informationLBA/Large Mode [Auto]Enables or disables the LBA mode. Setting this item to [Auto] enables the LBA mode if the device s

ASUS M4A785-M 2-92.4 Advanced menuThe Advanced menu items allow you to change the settings for the CPU and other system devices.Take caution when ch

2-10 Chapter 2: BIOS informationThe following item only appears when you set CPU Overclocking to [Manual].CPU/HT Reference Clock (MHz) [200]Sets the C

ASUS M4A785-M 2-11HT Over Voltage [Auto]Sets the CPU over voltage. The values range from 1.20000V to 1.38000V with a 0.01500V increment. Use the <

2-12 Chapter 2: BIOS informationtRDRD [Auto]Conguration options: [Auto] [3 CLK] [4 CLK] [5 CLK]tRFC0/1/2/3 [Auto]Conguration options: [Auto] [75ns]

ASUS M4A785-M 2-13UMA Frame Buffer Size [Auto]Conguration options: [Auto] [32MB] [64MB] [128MB] [256MB] [512MB]GFX0: primary video controller on a P

2-14 Chapter 2: BIOS informationFrame Buffer Location [Above 4G]Conguration options: [Below 4G] [Above 4G]AMD 785 HDMI Audio [Enabled]Enables or disa

ASUS M4A785-M 2-15The Module Version and USB Devices Enabled items show the auto-detected values. If no USB device is detected, the item shows None.U

2-16 Chapter 2: BIOS information Select Screen Select Item+- Change OptionF1 General HelpF10 Save and ExitESC Exitv02.61 (C)Copyright 198

ASUS M4A785-M 2-17Power on By PS/2 Keyboard [Disabled]Enables or disables PS/2 Keyboard to generate a wake event. Conguration options: [Disabled] [

viNoticesFederal Communications Commission StatementThis device complies with Part 15 of the FCC Rules. Operation is subject to the following two cond

2-18 Chapter 2: BIOS information2.6 Boot menuThe Boot menu items allow you to change the system boot options. Select an item then press <Enter>

ASUS M4A785-M 2-19Bootup Num-Lock [On]Selects the power-on state for the NumLock. Conguration options: [Off] [On]Wait for ‘F1’ If Error [Enabled]Whe

2-20 Chapter 2: BIOS informationChange User PasswordSelect this item to set or change the user password. The User Password item on top of the screen s

ASUS M4A785-M 2-212.7.2 Express Gate [Auto]Enables or disables the ASUS Express Gate feature. ASUS Express Gate is a unique instant-on environment

2-22 Chapter 2: BIOS informationExit & Save ChangesOnce you are nished making your selections, choose this option from the Exit menu to ensure th

viiSafety informationElectrical safety• To prevent electric shock hazard, disconnect the power cable from the electric outlet before relocating the sy

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

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