ASUS M4A77TD User Manual

M4A77TD

Motherboard

E4944

First Edition V1

August 2009

Copyright © 2009 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
permission of ASUSTeK Computer Inc. (“ASUS”).

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

product is defaced or missing.

ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS
DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS,
LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE),
EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY
DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.

SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE,
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO
RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS
MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.

Products and corporate names appearing in this manual may or may not be registered trademarks or

copyrights of their respective companies, and are used only for identication or explanation and to the
owners’ benet, without intent to infringe.

ii

Contents

Notices ......................................................................................................... vi

Safety information ..................................................................................... vii

About this guide ....................................................................................... viii

M4A77TD specications summary ............................................................ x

Chapter 1: Product introduction

1.1 Welcome! ...................................................................................... 1-1

1.2 Package contents ......................................................................... 1-1

1.3 Special features ............................................................................ 1-1

1.3.1 Product highlights ........................................................... 1-1

1.3.2 Innovative ASUS features ............................................... 1-3

1.4 Before you proceed ..................................................................... 1-5

1.5 Motherboard overview ................................................................. 1-6

1.5.1 Placement direction ........................................................ 1-6

1.5.2 Screw holes .................................................................... 1-6

1.5.3 Motherboard layout ......................................................... 1-7

1.5.4 Layout contents ............................................................... 1-7

1.6 Central Processing Unit (CPU) ................................................... 1-8

1.6.1 Installing the CPU ........................................................... 1-8

1.6.2 Installing the heatsink and fan ...................................... 1-10

1.7 System memory ......................................................................... 1-11

1.7.1 Overview ........................................................................1-11

1.7.2 Memory congurations .................................................. 1-12

1.7.3 Installing a DIMM .......................................................... 1-16

1.7.4 Removing a DIMM ........................................................ 1-16

1.8 Expansion slots .......................................................................... 1-17

1.8.1 Installing an expansion card ......................................... 1-17

1.8.2 Conguring an expansion card ..................................... 1-17

1.8.3 PCI slots ........................................................................ 1-17

1.8.4 PCI Express x1 slots ..................................................... 1-17

1.8.5 PCI Express x16 slot ..................................................... 1-17

1.9 Jumpers ...................................................................................... 1-18

1.10 Connectors ................................................................................. 1-19

1.10.1 Rear panel ports ........................................................... 1-19

1.10.2 Internal connectors ....................................................... 1-21

iii

Contents

1.11 Software support ........................................................................ 1-28

1.11.1 Installing an operating system ...................................... 1-28

1.11.2 Support DVD information .............................................. 1-28

Chapter 2: BIOS information

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

2.1.1 ASUS Update utility ........................................................ 2-1

2.1.2 ASUS EZ Flash 2 utility ................................................... 2-3

2.1.3 ASUS CrashFree BIOS utility ......................................... 2-4

2.2 BIOS setup program .................................................................... 2-5

2.2.1 BIOS menu screen .......................................................... 2-6

2.2.2 Menu bar ......................................................................... 2-6

2.2.3 Navigation keys ............................................................... 2-6

2.2.4 Menu items ..................................................................... 2-7

2.2.5 Submenu items ............................................................... 2-7

2.2.6 Conguration elds ......................................................... 2-7

2.2.7 Pop-up window ............................................................... 2-7

2.2.8 Scroll bar ......................................................................... 2-7

2.2.9 General help ................................................................... 2-7

2.3 Main menu .................................................................................... 2-8

2.3.1 System Time ................................................................... 2-8

2.3.2 System Date ................................................................... 2-8

2.3.3 Primary IDE Master/Slave, SATA 1/2/3/4/5/6 .................. 2-8

2.3.4 SATA Conguration ......................................................... 2-9

2.3.5 System Information ....................................................... 2-10

2.4 Advanced menu ......................................................................... 2-10

2.4.1 JumperFree Conguration ............................................ 2-10

2.4.2 CPU Conguration ........................................................ 2-13

2.4.3 Chipset .......................................................................... 2-14

2.4.4 Onboard Device Conguration ...................................... 2-15

2.4.5 PCIPnP ......................................................................... 2-15

2.4.6 USB Conguration ........................................................ 2-16

iv

Contents

2.5 Power menu ................................................................................ 2-17

2.5.1 Suspend Mode .............................................................. 2-17

2.5.2 ACPI 2.0 Support .......................................................... 2-17

2.5.3 ACPI APIC Support ....................................................... 2-17

2.5.4 APM Conguration ........................................................ 2-17

2.5.5 HW Monitor Conguration ............................................. 2-18

2.6 Boot menu .................................................................................. 2-19

2.6.1 Boot Device Priority ...................................................... 2-19

2.6.2 Boot Settings Conguration .......................................... 2-20

2.6.3 Security ......................................................................... 2-21

2.7 Tools menu ................................................................................. 2-22

2.7.1 ASUS EZ Flash 2 .......................................................... 2-23

2.7.2 Express Gate ................................................................ 2-23

2.7.3 AI NET 2........................................................................ 2-23

2.8 Exit menu .................................................................................... 2-24

v

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, and

• 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.

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.

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://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. 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.

vi

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.

•

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.

• The optical S/PDIF is an optional component (may or may not be included in your
motherboard) and is dened as a CLASS 1 LASER PRODUCT.

INVISIBLE LASER RADIATION, AVOID EXPOSURE TO BEAM.

• Never dispose of the battery in re. It could explode and release harmful substances into

the environment.

• Never dispose of the battery with your regular household waste. Take it to a hazardous

material collection point.

• Never replace the battery with an incorrect battery type.

• RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.

• DISPOSE OF USED BATTERIES ACCORDING TO THE ABOVE BATTERY-RELATED
INSTRUCTIONS.

vii

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 that 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.

This motherboard should only be used in environments with ambient temperatures between

5ºC (41ºF) and 40ºC (104ºF).

• Place the product on a stable surface.

• If you encounter technical problems with the product, contact a qualied service

technician or your retailer.

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.

viii

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 toInformation to prevent injury to yourself when trying to

complete a task.

CAUTION: Information to prevent damage to the components when trying toInformation 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.Tips and additional information to help you complete a task.

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.

Typography

Bol d te xt Indicates a menu or an item to select.Indicates a menu or an item to select.

Italics

Used to emphasize a word or a phrase.

<Key> Keys enclosed in the less-than and greater-than sign means
that you must press the enclosed key.
Example: <Enter> means that you must press the Enter or
Return key.

<Key1>+<Key2>+<Key3> If you must press two or more keys simultaneously, the key
names are linked with a plus sign (+).
Example: <Ctrl>+<Alt>+<D>

ix

M4A77TD specications summary

CPU AMD® Socket AM3 for AMD® Phenom™ II / Athlon™ II /

Chipset AMD® 770 / SB710

Front side bus Up to 5200MT/s HyperTransport™ 3.0 interface

Memory Dual-channel memory architecture

Expansion slots 1 x PCIe 2.0 x16 slot

Storage / RAID 1 x Ultra DMA 133/100/66 connector

LAN RTL8112L PCIe Gigabit LAN controller featuring AI NET2

Audio VIA® VT1708S High Denition Audio 8-channel CODEC

USB Supports up to 12 USB 2.0/1.1 ports (6 ports at mid-board,

Sempron™ 100 series processors
Supports 45nm CPU
AMD® Cool ‘n’ Quiet™ 2.0 Technology (depends on CPU
type)
Supports CPU up to 140W
* Refer to www.asus.com for the AMD® CPU support list

4 x 240-pin DIMM slots support maximum 16GB unbuffered
ECC and non-ECC DDR3 1800(O.C.) / 1600(O.C.) /
1333 / 1066MHz memory modules

* Refer to www.asus.com for the latest Memory QVL
(Qualied Vendors List).
** When you install a total memory of 4GB or more,
Windows® 32-bit 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.

2 x PCIe x1 slots
3 x PCI slots

6 x Serial ATA 3Gb/s connectors support RAID 0, RAID 1,
RAID 0+1, and JBOD congurations

Supports Jack-detect and Multi-streaming technologies
Supports Front Panel Retasking

Supports S/PDIF_OUT interface

6 ports at the back panel)

(continued on the next page)

x

M4A77TD specications summary

Back panel I/O ports 1 x PS/2 Keyboard / Mouse Combo port

Internal I/O connectors 3 x USB 2.0/1.1 connectors support additional

BIOS 8Mb Flash ROM, AMI BIOS, PnP, DMI2.0, WfM2.0,

ASUS special features ASUS Q-Fan

ASUS overclocking
features

Accessories 2 x Serial ATA cables

Support DVD Drivers

Form factor ATX form factor: 12 in x 8.4 in (30.5 cm x 21.3 cm)

1 x RJ-45 port
1 x COM port
1x LPT port

1 x Optical S/PDIF_OUT port
6 x USB 2.0/1.1 ports

8-channel audio ports

6 USB 2.0/1.1 ports
1 x IDE connector

6 x SATA connectors
1 x High denition front panel audio connector
1 x System panel connector

1 x S/PDIF_OUT connector
1 x CPU / 1 x Chassis fan connectors
1 x 24-pin EATX power connector
1 x 4-pin ATX 12V power connector

ACPI2.0a, SM BIOS 2.5

ASUS CrashFree BIOS3

ASUS EZ Flash2
ASUS MyLogo2

ASUS Express Gate
ASUS AI NET2
ASUS EPU-4 Engine

ASUS Turbo Key
SFS (Stepless Frequency Selection) supports:

– FSB tuning from 200MHz to 550MHz at 1MHz

increment

– PCIe frequency tuning from 100MHz to 150MHz at
1MHz increment

ASUS C.P.R. (CPU Parameter Recall)

1 x Ultra DMA 133/100/66 cable
1 x I/O shield

1 x User Manual

ASUS Update
ASUS PC Probe II
Anti-Virus software (OEM version)

*Specications are subject to change without notice.

xi

xii

Chapter 1

Product introduction

1.1 Welcome!

Thank you for buying an ASUS® M4A77TD motherboard!
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.

1.2 Package contents

Check your motherboard package for the following items.

Motherboard ASUS M4A77TD motherboard

Cables 2 x Serial ATA cables
1 x Ultra DMA 133/100/66 cable

Accessories 1 x I/O shield

Application DVD ASUS motherboard Support DVD
Documentation User Manual

If any of the above items is damaged or missing, contact your retailer.

1.3 Special features

1.3.1 Product highlights

AMD® Phenom™ II / Athlon™ II / Sempron™ 100 series CPU

ASUS M4A77TD 1-1

support

This motherboard supports AMD® Socket AM3 multi-core processors
with unique L3 cache and delivers better overclocking capabilities
with less power consumption. It features dual-channel DDR3 1333

memory support and accelerates data transfer rate up to 5200MT/s via
HyperTransport™ 3.0-based system bus. This motherboard also supports

AMD® CPUs in the new 45nm manufacturing process.

AMD® 770 Chipset

MT/s

5200

The AMD® 770 Chipset is designed to support up to 5200MT/s

HyperTransport™ 3.0 (HT 3.0) interface speed and PCI Express 2.0
x16 graphics. It is optimized with AMD’s latest AM3 multi-core CPUs to

provide excellent system performance and overclocking capabilities.

HyperTransport™ 3.0 support

HyperTransport™ 3.0 technology provides 2.6 times more bandwidth
than HT1.0 that radically improves system efciency for a smoother and

faster computing environment.

AMD® Cool ‘n’ Quiet Technology

This motherboard supports the AMD® Cool ‘n’ Quiet technology which
monitors system operation and automatically adjusts CPU voltage and
frequency for a cool and quiet operating environment.

DDR3 1800(O.C.) support

This motherboard supports DDR3 1800(O.C.)/1600(O.C.)/1333/
1066MHz memory that features faster data transfer rates and more

bandwidth to meet the requirements of the latest operation system, 3D
graphics, multimedia, and Internet applications. The dual-channel DDR3
architecture doubles the bandwidth of your system memory to boost
system performance, eliminating bottlenecks with peak bandwidth up to

25.6GB/s. Furthermore, the supply voltage for the memory is reduced
from 1.8V for DDR2 to just 1.5V for DDR3. This voltage reduction limits

the power consumption and heat generation of DDR3, which makes it an
ideal memory solution.

PCI Express 2.0 support

This motherboard supports PCI Express 2.0 devices for double speed

and bandwidth which enhances system performance.

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.

Chapter 1: Product introduction1-2

Serial ATA 3Gb/s technology

This motherboard supports hard drives based on the Serial ATA (SATA)

3Gb/s storage specication, delivering enhanced scalability and doubling

the bus bandwidth for high-speed data retrieval and save.

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.

1.3.2 Innovative ASUS features

ASUS Express Gate

ASUS Express Gate is an instant-on environment that gives you quick
access to the Internet. Five seconds after powering on your computer,
you can instantly surf the Internet without entering the Windows® OS.

• ASUS Express Gate supports installation on SATA HDDs, USB HDDs and ash drives
with at least 1.2GB free disk space. When installing it on USB HDDs or ash drives,

connect the drives to the motherboard USB port before turning on the computer.

• The actual boot time depends on the system conguration.

• ASUS Express Gate supports le uploading from SATA HDDs, ODDs and USB drives. It
supports le downloading to USB drives only.

• ASUS Express Gate complies with the OpenGL standard. Refer to support.asus.com for
Express Gate source codes.

ASUS Turbo Key

ASUS Turbo Key allows you to turn the PC power button into
an overclocking button. After the easy setup, Turbo Key boosts
performances without interrupting ongoing work or games, simply through
pressing the button.

ASUS M4A77TD 1-3

ASUS MyLogo2™

Turn your favorite photos into 256-color boot logos to personalize your

system.

ASUS CrashFree BIOS 3

ASUS CrashFree BIOS 3 is an auto-recovery tool that allows you to

restore a corrupted BIOS le using the bundled support DVD or a USB
ash disk that contains the BIOS le.

ASUS EZ Flash 2

ASUS EZ Flash 2 allows you to update the BIOS from a USB ash disk

before entering the OS.

ASUS Q-Fan

ASUS Q-Fan technology intelligently adjusts the CPU fan speed

according to system loading to ensure a quiet, cool, and efcient

operation.

ASUS EPU

ASUS EPU is a unique power saving technology that detects the current
system loadings and adjusts the power consumption in real time.

ASUS AI NET2

ASUS AI NET2 remotely detects the cable connection immediately after

you turn on the system and any faulty cable connections are reported

back up to 100 meters at 1 meter accuracy.

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.

Green ASUS

This motherboard and its packaging comply with the European Union’s
Restriction on the use of Hazardous Substances (RoHS). This is in line

with the ASUS vision of creating environment-friendly and recyclable

products/packaging to safeguard consumers’ health while minimizing the

impact on the environment.

Chapter 1: Product introduction1-4

1.4 Before you proceed

SB_PWR

ON

Standby Power Powered Of

f

OFF

M4A77TD

M4A77TD Onboard power 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.

Onboard 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.

ASUS M4A77TD 1-5

M4A77TD

1.5 Motherboard overview

1.5.1 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.

1.5.2 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.

Chapter 1: Product introduction1-6

1.5.3 Motherboard layout

M4A77TD

PCIEX16

PCIEX1_1

PCIEX1_2

PCI2

PCI3

PCI1

USB910USB78 USB1112

SPDIF_OUT

AAFP

ATX12V

EATXPWR

CPU_FAN

CHA_FAN

Lithium Cell

CMOS Power

Super

I/O

VIA

VT1708S

RTL

8112L

ICS

9LPRS485

KB_USB56

8Mb

BIOS

SB_PWR

PANEL

CLRTC

DDR3 DIMM_A2 (64bit, 240-pin module)

SOCKET AM3

DDR3 DIMM_B2 (64bit, 240-pin module)

DDR3 DIMM_A1 (64bit, 240-pin module)

DDR3 DIMM_B1 (64bit, 240-pin module)

SATA1 SATA2 SATA3

SATA4 SATA5 SATA6

AUDIO

LPT

COM1

SPDIF_O

LAN1_USB12

USB34

30.5cm(12.0in)

PRI_IDE

AMD

®

SB710

AMD

®

770

21.3cm(8.4in)

2 3 1

5

1 4

812 11 10 9

2

7

6

1.5.4 Layout contents

Connectors/Jumpers/Slots/LED Page Connectors/Jumpers/Slots/LED Page

1. CPU and chassis fan connectors

(4-pin CPU_FAN and 3-pin CHA_FAN)

2. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V) 1-21 8. USB connectors (10-1 pin USB78, USB910,

3. CPU Socket AM3 1-8 9. Clear RTC RAM (3-pin CLRTC) 1-18

4. DDR3 DIMM slots 1-11 10. Onboard power LED (SB_PWR) 1-5

5. IDE connector (40-1 pin PRI_IDE) 1-22 11. Digital audio connector (4-1 pin SPDIF_OUT) 1-26

6. SATA connectors (7-pin SATA1, SATA2, SATA3, SATA4,

SATA5, and SATA6)

ASUS M4A77TD 1-7

1-27 7. System panel connector (20-8 pin PANEL) 1-24

USB1112)

1-23 12. Front panel audio connector (10-1 pin AAFP) 1-26

1-25

1.6 Central Processing Unit (CPU)

M4A77TD

M4A77TD CPU socket AM3

This motherboard comes with an AM3 socket designed for Phenom™ II / Athlon™ II /
Sempron™ 100 series processors.

The AM3 socket has a different pinout from the AM2+/AM2 socket. Ensure that you use a
CPU designed for the AM3 socket. The CPU ts in only one correct orientation. DO NOT

force the CPU into the socket to prevent bending the pins and damaging the CPU!

1.6.1 Installing the CPU

To install a CPU:

1. Locate the CPU socket on the motherboard.

2. Press the lever sideways to unlock the
socket, then lift it up to a 90°-100° angle.

Ensure that the socket lever is lifted up to a 90°-100° angle; otherwise, the CPU will not t

in completely.

3. Position the CPU above the socket such that the CPU
corner with the gold triangle matches the socket corner
with a small triangle.

4. Carefully insert the CPU into the socket until it ts in place.

The CPU ts only in one correct orientation.

DO NOT force the CPU into the socket to
prevent bending the pins and damaging the
CPU!

Socket lever

Small triangle

Gold triangle

Chapter 1: Product introduction1-8

5. When the CPU is in place, push down the socket

CPU_FAN

GND
CPU FAN PWR
CPU FAN IN
CPU FAN PWM

M4A77TD

M4A77TD CPU fan connector

lever to secure the CPU. The lever clicks on the side
tab to indicate that it is locked.

6. Install a CPU heatsink and fan following the
instructions that comes with the heatsink package.
You can also refer to section 1.6.2 Installing
heatsink and fan for instructions.

7. Connect the CPU fan cable to the CPU_FAN connector on the motherboard.

DO NOT forget to connect the CPU fan connector! Hardware monitoring errors can occur if
you fail to plug this connector.

ASUS M4A77TD 1-9

1.6.2 Installing the heatsink and fan

1

3

4

5

2

Ensure that you use only AMD-certied heatsink and fan assembly.

To install the CPU heatsink and fan:

1. Place the heatsink on top of the installed CPU, ensuring that the heatsink ts properly

on the retention module base.

• The retention module base is already installed on the motherboard upon purchase.

• You do not have to remove the retention module base when installing the CPU or
installing other motherboard components.

• If you purchased a separate CPU heatsink and fan assembly, ensure that a Thermal
Interface Material is properly applied to the CPU heatsink or CPU before you install the
heatsink and fan assembly.

CPU Fan

CPU Heatsink

Retention bracket

Retention Module Base

Retention bracket lock

Your boxed CPU heatsink and fan assembly should come with installation instructions for
the CPU, heatsink, and the retention mechanism. If the instructions in this section do not
match the CPU documentation, follow the latter.

2. Attach one end of the retention bracket to the retention module base.

Chapter 1: Product introduction1-10

3. Align the other end of the retention bracket to the retention module base. A clicking

M4A77TD

M4A77TD 240-pin DDR3 DIMM sockets

DIMM_A1

DIMM_B1

DIMM_A2

DIMM_B2

sound denotes that the retention bracket is in place.

Ensure that the fan and heatsink assembly perfectly ts the retention mechanism module

base, otherwise you cannot snap the retention bracket in place.

4. Push down the retention bracket lock on the retention mechanism to secure the
heatsink and fan to the module base.

5. When the fan and heatsink assembly is in place, connect the CPU fan cable to the

connector on the motherboard labeled CPU_FAN.

DO NOT forget to connect the CPU fan connector! Hardware monitoring errors can occur if
you fail to plug this connector.

1.7 System memory

1.7.1 Overview

This motherboard comes with four 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 and DIMM_A2

Channel B DIMM_B1 and DIMM_B2

ASUS M4A77TD 1-11

1.7.2 Memory congurations

You may install 512MB, 1GB, 2GB, and 4GB unbuffered ECC and 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.

• Always install DIMMs with the same CAS latency. For optimum compatibility, we
recommend that you obtain memory modules from the same vendor.

• Due to the memory address limitation on 32-bit Windows® OS, when you install 4GB

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 WindowsInstall a maximum of 3GB system memory if you are using a 32-bit Windows

OS.

- Use a 64-bit WindowsWindows® OS if you want to install 4GB or more memory on the
motherboard.

• This motherboard does not support DIMMs made up of 256 megabits (Mb) chips or less.

M4A77TD Motherboard Qualied Vendors Lists (QVL)

DDR3-1866(O.C.)MHz capability

®

Vendor Part No. Size

Kingston KHX14900D3K3/3GX(XMP) 3072MB(kit of 3) SS N/A Heat-Sink Package 9-9-9-27 • •

SS/DSChip

Brand

Chip NO. CL

A* B* C*

DDR3-1800(O.C.)MHz capability

Vendor Part No. Size SS/DSChip

Corsair CM3X2G1800C8D 2048MB DS N/A Heat-Sink Package N/A • •

Kingston KHX14400D3K2/2G 2048MB(Kit of 2) SS N/A Heat-Sink Package 8-8-8-24 • •

Kingston KHX14400D3K3/3GX(XMP) 3072MB(kit of 3) SS N/A Heat-Sink Package 9-9-9-27 • •

Kingston KHX14400D3K2/2GN(EPP) 4096MB(kit of 2) DS N/A Heat-Sink Package 8-8-8-24 •

Chip NO. CL DIMM support

Brand

Chapter 1: Product introduction1-12

A* B* C*

DIMM support

DDR3-1600(O.C.)MHz capability

Vendor Part No. Size

A-Data AD31600X002GMU 4096MB(Kit of 2) DS N/A Heat-Sink Package 7-7-7-20 •

Corsair CM3X1G1600C9DHX 2048MB(Kit of 2) SS N/A Heat-Sink Package 9-9-9-24 • • •

CRUCIAL BL12864BA1608.8SFB(XMP) 3072MB(Kit of 3) SS N/A Heat-Sink Package 8-8-8-24 • • •

CRUCIAL BL12864BE2009.8SFB3(EPP) 3072MB(Kit of 3) SS N/A Heat-Sink Package 9-9-9-28 • • •

Crucial BL25664TB1608.K16SF(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8-24 •

Crucial BL25664TG1608.K16SF(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8-24 • • •

Crucial BL25664TR1608.K16SF(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8-24 • • •

G.SKILL F3-12800CL9D-2GBNQ 2048MB(Kit of 2) SS N/A Heat-Sink Package 9-9-9-24 • • •

G.SKILL F3-12800CL8T-6GBHK 2048MB DS N/A Heat-Sink Package 8-8-8-21 • • •

G.SKILL F3-12800CL9T-6GBNQ 6144MB(Kit of 3) DS N/A Heat-Sink Package 9-9-9-24 • • •

kingmax FLGD45F-B8KG9 1024MB SS kingmax KFB8FNGXF-ANX-12A N/A • • •

kingmax FLGE85F-B8KG9 2048MB DS kingmax KFB8FNGXF-ANX-12A N/A • • •

Kingston KHX12800D3LLK3/3GX(XMP) 3072MB(kit of 3) SS N/A Heat-Sink Package 8-8-8-24 • • •

Kingston KHX12800D3K2/4G 4096MB(kit of 2) DS N/A Heat-Sink Package 9-9-9-27 • • •

Kingston KHX12800D3LLK3/6GX(XMP) 6144MB(Kit of 3) DS N/A Heat-Sink Package 8-8-8-24 • • •

SS/DSChip

Brand

Chip NO. CL

DIMM support

A* B* C*

We recommend that you install the DDR3 1600+ memory modules on the blue slots for

better overclocking performance.

DDR3-1333MHz capability

Vendor Part No. Size

A-Data AD31333001GOU 1024MB SS A-Data AD30908C8D-151C E0906 N/A • •

A-Data AD31333002GOU 2048MB DS A-Data AD30908C8D-151C E0903 N/A • •

Apacer 78.01GC6.9L0 1024MB SS Apacer AM5D5808AEWSBG0914E 9 • • •

Apacer 78.A1GC6.9L1 2048MB DS Apacer AM5D5808AEWSBG0908D 9 • • •

Corsair CM3X1024-1333C9DHX 1024MB SS N/A Heat-Sink Package N/A • •

Corsair CM3X1024-1333C9 1024MB SS N/A Heat-Sink Package N/A • • •

CORSAIR TR3X3G1333C9

Corsair CM3X1024-1333C9DHX 1024MB DS Corsair Heat-Sink Package N/A • • •

CRUCIAL BL12864TA1336.8SFB1

Crucial MT8JTF12864AY-1G4D1

Crucial BL25664ABA1336.16SFB1

Crucial MT16JTF25664AY-1G4D1

G.SKILL F3-10600CL8D-2GBHK 1024MB SS G.SKILL Heat-Sink Package N/A • • •

G.SKILL F3-10600CL9D-2GBPK 1024MB SS G.SKILL Heat-Sink Package N/A • • •

G.SkiLL F3-10666CL7T-3GBPK

G.SkiLL F3-10666CL9T-3GBNQ

G.SKILL F3-10600CL7D-2GBPI 1024MB DS G.SKILL Heat-Sink Package N/A • • •

3072MB(Kit

of 3)

2048MB(Kit
of 2)

3072MB(Kit

of 3)

4096MB(Kit
of 2)

6144MB(Kit
of 3 )

3072MB(Kit

of 3)

3072MB(Kit

of 3)

SS/

Chip Brand Chip NO. CL

DS

SS N/A Heat-Sink Package 9 • • •

SS N/A Heat-Sink Package 6-6-6-20 • • •

DS Micron 9FD22D9JNM 9 • • •

DS N/A Heat-Sink Package 6-6-6-20 • • •

DS Micron 8UD22D9JMN 9 • • •

SS N/A Heat-Sink Package 7-7-7-18 • • •

SS N/A Heat-Sink Package 9-9-9-24 • • •

DIMM support

A* B* C*

(continued on the next page)

ASUS M4A77TD 1-13

DDR3-1333MHz capability

Vendor Part No. Size

G.SKILL F3-10600CL9D-2GBNQ 1024MB DS G.SKILL Heat-Sink Package N/A • • •

G.SKILL F3-10666CL9D-4GBPK 2048MB DS G.SKILL Heat-Sink Package N/A • • •

G.SkiLL F3-10666CL7T-6GBPK

G.SKILL F3-1066CL9T-6GBNQ

GEIL DDR3-1333 CL9-9-9-24 1024MB SS N/A Heat-Sink Package 9 • • •

GEIL GV34GB1333C7DC 2048MB DS N/A Heat-Sink Package 7-7-7-24 • • •

GEIL DDR3-1333 CL9-9-9-24

Kingston KVR1333D3N9/1G 1024MB SS elpida J1108BABG-DJ-E 9 • • •

Kingston KVR1333D3N9/2G 2048MB DS elpida J1108BABG-DJ-E 9 • • •

Micron MT8JTF12864AY-1G4D1 1024MB SS Micron 8LD22D9JNM N/A • • •

Micron MT16JTF25664AY-1G1D1 2048MB DS Micron 8LD22 D9JNM N/A • • •

Micron MT8JTF12864AY-1G4D1

Micron MT16JTF25664AY-1G4D1

OCZ OCZ3P13334GK

OCZ OCZ3P13334GK

Samsung M378B2873DZ1-CH9 1024MB SS Samsung K4B1G0846D-HCH9 N/A • •

SAMSUNG M378B2873DZ1-CH9 1024MB SS SAMSUNG SEC 846 HCH9 K4B1G08460 N/A • • •

Samsung M378B2873EH1-CH9 1024MB SS Samsung SEC 913 HCH9 K4B1G0846E N/A • • •

Samsung M391B2873DZ1-CH9 1024MB SS Samsung K4B1G0846D-HCH9 N/A • • •

Samsung M378B5673DZ1-CH9 2048MB DS Samsung K4B1G0846D-HCH9 N/A • • •

Samsung M378B5673EH1-CH9 2048MB DS Samsung SEC 913 HCH9 K4B1G0846E N/A • • •

Samsung M391B5673DZ1-CH9 2048MB DS Samsung K4B1G0846D-HCH9 N/A • • •

Super Talent W1333X2GB8 1024MB SS N/A Heat-Sink Package N/A • • •

Transcend SEC 813HCH9 K4B1G0846D 1024MB SS N/A TS128MLK64V3U N/A • • •

Transcend TS128MLK72V3U 1024MB SS N/A K4B1G0846D(ECC) N/A • • •

Transcend SEC816HCH9K4B1G0846D 2048MB DS N/A TS256MLK64V3U N/A • • •

Adata AD31333G002GMU 2048MB DS N/A Heat-Sink Package 8-8-8-24 • • •

ASint SLY3128M8-EDJ 1024MB SS ASint DDRII1208-DJ 0844 N/A • • •

ASint SLY3128M8-EDJ 2048MB DS ASint DDRII1208-DJ 0844 N/A • •

CENTURY PC3-10600 DDR3-1333 9-9-9 1024MB SS Micron 8FD22D9JNM N/A •

Kingtiger 2GB DIMM PC3-10666 2048MB DS Samsung SEC 904 HCH9 K4B1G0846D N/A •

Kingtiger KTG2G1333PG3 2048MB DS N/A Heat-Sink Package N/A •

PATRIOT PSD31G13332H 1024MB DS N/A Heat-Sink Package 9 • • •

Patriot PSD31G13332 1024MB DS Patriot PM64M8D38U-15 N/A • •

Takems TMS1GB364D081-107EY 1024MB SS N/A Heat-Sink Package 7-7-7-20 • • •

Takems TMS1GB364D081-138EY 1024MB SS N/A Heat-Sink Package 8-8-8-24 • • •

SS/

Chip Brand Chip NO. CL

DS

6144MB(Kit

DS N/A Heat-Sink Package 7-7-7-18 • • •

of 3 )

6144MB(Kit

DS N/A Heat-Sink Package 9-9-9-24 • • •

of 3)

6144MB(Kit

DS N/A Heat-Sink Package 9 • • •

of 3 )

3072MB(Kit

DS Micron 9FD22D9JNM 9 • • •

of 3)

6144MB(Kit

DS Micron 8UD22D9JMN 9 • • •

of 3 )

4096MB(Kit

DS N/A Heat-Sink Package 7-7-7-20 • • •

of 2)

4096MB(Kit

DS N/A Heat-Sink Package 7-7-7-20 • •

of 2)

DIMM support

A* B* C*

Chapter 1: Product introduction1-14

DDR3-1066MHz capability

Vendor Part No. Size

Elpida EBJ51UD8BAFA-AC-E 512MB SS elpida J5308BASE-AC-E N/A • • •

Elpida EBJ51UD8BAFA-AE-E 512MB SS elpida J5308BASE-AC-E N/A • • •

G.SKILL F3-8500CL6D-2GBHK 1024MB SS G.SKILL Heat-Sink Package N/A • • •

Kingston KVR1066D3N7/1G 1024MB SS elpida J1108BABG-DJ-E 7 • • •

Kingston KVR1066D3N7/1G 1024MB SS elpida J5308BASE-AE-E S 7 • • •

Kingston KVR1066D3N7/2G 2048MB DS elpida J1108BABG-DJ-E 7 • • •

Micron MT8JTF12864AY-1G1D1 1024MB SS Micron 8ED22D9JNL N/A • • •

Micron MT16JTF25664AY-1G1D1 2048MB DS Micron 8LD22D9JNL N/A • • •

OCZ OCZ3SOE10662GK 2048MB(Kit of 2) DS N/A Heat-Sink Package 7-7-7-16 • • •

Samsung M378B2873CZ0-CF8 1024MB SS Samsung K4B1G0846C-ZCF8 N/A • • •

Samsung M378B2873CZ0-CG8 1024MB SS Samsung K4B1G0846C-ZCG8 N/A • • •

Samsung M378B2873EH1-CF8 1024MB SS Samsung SEC 901 HCF8 K4B1G0846E N/A • • •

SAMSUNG M378B5273BH1-CF8 4096MB DS SAMSUNG 846 K4B2G0846B-HCF8 N/A • • •

Kingtiger 2GB DIMM PC3-8500 2048MB DS Hynix H5TQ1G83AFP G7C N/A • •

SS/DSChip

Brand

Chip NO. CL

SS: Single-sided / DS: Double-sided
DIMM support:

• A*: Supports one module inserted into any slot as single-channel memory conguration.

• B*: Supports one pair of modules inserted into either the blue slots or the black slots as

one pair of dual-channel memory conguration.

• C*: Supports two pairs of modules inserted into both the blue slots and the black slots as

two pairs of dual-channel memory conguration.

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

DIMM support

A* B* C*

ASUS M4A77TD 1-15

1.7.3 Installing a DIMM

Unplug the power supply before adding or removing DIMMs or other system components.
Failure to do so can cause severe damage to both the motherboard and the components.

1. Press the retaining clips outward to
unlock a DIMM socket.

2. Align a DIMM on the socket such that

the notch on the DIMM matches the
break on the socket.

1

Unlocked retaining clip

A DIMM is keyed with a notch so that it ts in only one direction. DO NOT force a DIMM into

a socket to avoid damaging the DIMM.

3. Firmly insert the DIMM into the socket
until the retaining clips snap back in place
and the DIMM is properly seated.

Locked Retaining Clip

1.7.4 Removing a DIMM

To remove a DIMM:

1. Simultaneously press the retaining clips
outward to unlock the DIMM.

Support the DIMM lightly with your

ngers when pressing the retaining

clips. The DIMM might get damaged

when it ips out with extra force.

2

DIMM notch

1

3

2

1

1

DIMM notch

2. Remove the DIMM from the socket.

Chapter 1: Product introduction1-16

1.8 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.

1.8.1 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.

1.8.2 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.

1.8.3 PCI slots

The PCI slots support cards such as a LAN card, SCSI card, USB card, and other cards that

comply with PCI specications.

1.8.4 PCI Express x1 slots

This motherboard supports PCI Express x1 network cards, SCSI cards, and other cards that

comply with the PCI Express specications.

1.8.5 PCI Express x16 slot

This motherboard supports a PCI Express x16 graphics card that comply with the PCI

Express specications.

ASUS M4A77TD 1-17

1.9 Jumpers

M4A77TD

M4A77TD 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 <Del> key during the boot process and enter BIOS setup to 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!

• If the steps above do not help, remove the onboard battery and move the jumper again

• You do not need to clear the RTC when the system hangs due to overclocking. For

to clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the battery.

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.

Chapter 1: Product introduction1-18

1.10 Connectors

3

10

2

12

1

14

4 5 6 7

89

13

11

1.10.1 Rear panel ports

1. PS/2 Keyboard / Mouse Combo port (purple). This port is for a PS/2 keyboard or

mouse.

2. Parallel port. This 25-pin port connects to a parallel printer, a scanner, or other

devices.

3. LAN (RJ-45) port. This port allows Gigabit connection to a Local Area Network (LAN)

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

4. Center/Subwoofer port (orange). This port connects to the center/subwoofer

speakers.

5. Rear Speaker Out port (black). This port connects to the rear speakers in the

4, 6, and 8-channel audio congurations.

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

audio sources.

7. Line Out port (lime). This port connects to a headphone or a speaker. In the 4, 6 and

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

8. Microphone port (pink). This port connects to a microphone.

9. Side Speaker Out port (gray). This port connects to the side speakers in the

8-channel audio conguration.

ASUS M4A77TD 1-19

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

ACT/LINK

LED

LAN port

SPEED

LED

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

Port

Light Blue Line In Line In Line In Line In

Lime Line Out Front Speaker Out Front Speaker Out Front Speaker Out

Pink Mic In Mic In Mic In Mic In

Orange – – Center/Subwoofer Center/Subwoofer

Black – Rear Speaker Out Rear Speaker Out Rear Speaker Out

Gray – – – Side Speaker Out

Headset

2-channel

Ensure the audio device of sound playback is VIA High Denition Audio (the name may
be different based on the OS). Go to Start > Control Panel > Sounds and Audio Devices

> Sound Playback to congure the settings.

4-channel 6-channel 8-channel

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

USB 2.0 devices.

11. USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports are for USB

2.0 devices.

12. COM port. This 9-pin COM1 port is for pointing devices or other serial devices.

13. Optical S/PDIF_OUT port. This port connects to an external audio output device via

an optical S/PDIF cable.

14. USB 2.0 ports 5 and 6. These two 4-pin Universal Serial Bus (USB) ports are for

USB 2.0 devices.

Chapter 1: Product introduction1-20

1.10.2 Internal connectors

M4A77TD

M4A77TD ATX power connectors

EATXPWR

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

PIN 1

+12V DC

+12V DC

GND

GND

1. 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 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 ATX12V 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 M4A77TD 1-21

2. IDE connector (40-1 pin PRI_IDE)

PRI_IDE

NOTE:Orient the red markings
on the IDE ribbon cable to PIN 1.

PIN1

M4A77TD

M4A77TD IDE connector

The onboard IDE connector is for Ultra DMA 133/100/66 signal cable. There are three
connectors on each Ultra DMA 133/100/66 signal cable: blue, black, and gray. Connect
the blue connector to the motherboard’s IDE connector, then select one of the following
modes to congure your devices:

Drive jumper setting Mode of device(s) Cable connector

Single device Cable-Select or Master - Black

Cable-Select

Two devices

Master Master

Slave Slave

• Pin 20 on the IDE connector is removed to match the covered hole on the Ultra DMA

cable connector. This prevents incorrect insertion when you connect the IDE cable.

• Use the 80-conductor IDE cable for Ultra DMA 133/100/66 IDE devices.

If any device jumper is set as “Cable-Select”, ensure that all other device jumpers have the
same setting.

Master Black

Slave Gray

Black or gray

Chapter 1: Product introduction1-22

3. Serial ATA connectors (7-pin SATA1, SATA2, SATA3, SATA4, SATA5, and SATA6)

SATA1

GND

RSATA_TXP1

RSATA_TXN1

GND

RSATA_RXP1

RSATA_RXN1

GND

SATA2

GND

RSATA_TXP2

RSATA_TXN2

GND

RSATA_RXP2

RSATA_RXN2

GND

SATA3

GND

RSATA_TXP3

RSATA_TXN3

GND

RSATA_RXP3

RSATA_RXN3

GND

SATA4

GND

RSATA_TXP4

RSATA_TXN4

GND

RSATA_RXP4

RSATA_RXN4

GND

SATA5

GND

RSATA_TXP5

RSATA_TXN5

GND

RSATA_RXP5

RSATA_RXN5

GND

SATA6

GND

RSATA_TXP6

RSATA_TXN6

GND

RSATA_RXP6

RSATA_RXN6

GND

M4A77TD

M4A77TD SATA connectors

These connectors are for the Serial ATA signal cables for Serial ATA 3Gb/s hard disk
and optical disk drives. The Serial ATA 3Gb/s is backward compatible with Serial ATA

1.5Gb/s specication. The data transfer rate of the Serial ATA 3Gb/s is faster than the
standard parallel ATA with 133MB/s (Ultra DMA133). If you install Serial ATA hard disk
drives, you can create a RAID 0, RAID 1, or RAID 0+1 set through the onboard SB710

chipset.

• Install the Windows® XP Service Pack 1 or later versions before using Serial ATA.

• If you intend to create a SATA RAID set, set the type of the SATA connectors to [RAID]

in the BIOS. See 2.3.4 SATA Conguration for details.

• The motherboard does not provide a oppy disk drive connector. You could use a USB
oppy disk drive when installing Windows® XP operating system on a hard disk drive
that includes a RAID/AHCI set.

• Due to Windows® XP limitation, Windows® XP may not recognize the USB oppy disk
drive.

• For more details on RAID/AHCI, refer to the RA ID/AHCI Supplementary Guide included

in the folder named Manual in the support DVD.

ASUS M4A77TD 1-23

4. System panel connector (20-8 pin PANEL)

M4A77TD

M4A77TD System panel connector

PIN 1

* Requires an ATX power supply

PLED SPEAKER

PLED+

PLED-

+5V

Ground

Ground

Speaker

IDE_LED+

IDE_LED-

PWR

Ground

Reset

Ground

PANEL

IDE_LED PWRSW RESET

This connector supports several chassis-mounted functions.

•

System power LED

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

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.

•

System warning speaker

This 4-pin connector is for the chassis-mounted system warning speaker. The speaker

allows you to hear system beeps and warnings.

•

Power/Soft-off button

This 2-pin connector is for the system power button. Pressing the power button turns

the system ON or puts the system in SLEEP or SOFT-OFF mode depending on the
BIOS settings. Pressing the power switch for more than four seconds while the system
is ON turns the system OFF.

•

Reset button

This 2-pin connector is for the chassis-mounted reset button for system reboot without

turning off the system power.

Chapter 1: Product introduction1-24

5. USB connectors (10-1 pin USB78, USB910, USB1112)

M4A77TD

M4A77TD USB2.0 connectors

PIN 1

USB+5V

USB_P10-

USB_P10+

GND

NC

USB+5V

USB_P9-

USB_P9+

GND

USB910USB78

PIN 1

USB+5V

USB_P8-

USB_P8+

GND

NC

USB+5V

USB_P7-

USB_P7+

GND

USB1112

PIN 1

USB+5V

USB_P12-

USB_P12+

GND

NC

USB+5V

USB_P11-

USB_P11+

GND

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.

ASUS M4A77TD 1-25

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

SPDIF_OUT

+5V

SPDIFOUT

GND

M4A77TD

M4A77TD Digital audio connector

M4A77TD

M4A77TD Front panel audio connector

AAFP

PIN 1

GND

PRESENCE#

SENSE1_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.

Ensure that the audio device of Sound playback is VIA High Denition Audio (the name

may be different based on the OS). Go to Start > Control Panel > Sounds and Audio
Devices > Sound Playback to congure the setting.

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 Select item in the BIOS to [HD Audio]. See section 2.4.4 Onboard
Device Conguration for details.

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

Chapter 1: Product introduction1-26

8. CPU and chassis fan connectors (4-pin CPU_FAN and 3-pin CHA_FAN)

CPU_FAN

GND
CPU FAN PWR
CPU FAN IN
CPU FAN PWM

M4A77TD

M4A77TD fan connectors

CHA_FAN

Rotation

+12V
GND

The fan connectors support cooling fans of 350mA~740mA (8.88W max.) or a total of
1A~2.22A (26.64W max.) at +12V. 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.

Only the 4-pin CPU fan supports the ASUS Q-Fan feature.

ASUS M4A77TD 1-27

1.11 Software support

1.11.1 Installing an operating system

This motherboard supports Windows® XP/Vista/7 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® XP Service Pack 3 or later versions / Windows® Vista
Service Pack 1 or later versions before installing the drivers for better compatibility and
system stability.

1.11.2 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. The DVD automatically displays the Drivers
menu if Autorun is enabled on your computer.

The following screen is for reference only.

Click an item to install

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.

Click an icon to
display Support DVD/
motherboard information

Chapter 1: Product introduction1-28

Chapter 2

BIOS information

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 into the optical drive. The Drivers menu appears.

2. Click the Utilities tab, then click ASUS Update.

3. Follow the onscreen instructions to complete the installation.

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

ASUS M4A77TD 2-1

Updating the BIOS

To update the BIOS:

1. From the Windows® desktop, click Start > Programs > ASUS > ASUS Update >

ASUS Update to launch the ASUS Update utility.

2. From the dropdown list, select either of the following methods:

Updating from the Internet

a. Select Update BIOS from the Internet, then click Next.

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

Select then click Next.

c. From the FTP site, select the BIOS version that you want 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 Update BIOS from a le, then click Next.

b. Locate the BIOS le from the Open window, then click Open.

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

2-2 Chapter 2: BIOS information

2.1.2 ASUS EZ Flash 2 utility

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, then launch
EZ Flash 2 in either of these two ways:

• Press <Alt> + <F2> during POST.

• Enter the BIOS setup program. Go to the Tools menu to select EZ Flash 2 and
press <Enter> to enable it.

2. Press <Tab> to switch between drives until the correct BIOS le is found, then press
<Enter>. EZ Flash 2 performs the BIOS updating process and automatically reboots

the system when done.

ASUSTek EZ Flash 2 BIOS ROM Utility V3.36

FLASH TYPE: MXIC 25L8005

Current ROM

BOARD: M4A77TD
VER: 0205 (H:00 B:03)
DATE: 07/30/2009

PATH: C:\

C:

Update ROM

BOARD: Unknown
VER: Unknown
DATE: Unknown

Note

[ Ente r] Sel ect o r Lo ad [ Tab ] Sw itc h [V ] Dr ive In fo
[Up/Down/Home/End] Move [B] Backup [ESC] Exit

• This function supports USB ash disks with FAT 32/16 format and single partition only.

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

ASUS M4A77TD 2-3

2.1.3 ASUS CrashFree BIOS utility

The ASUS CrashFree BIOS 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 removable device that contains the updated
BIOS le.

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

M4A77TD.ROM.

• 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.

• The removable devices that ASUS CrashFree BIOS supports vary with motherboard

models. For motherboards without a oppy connector, prepare a USB ash disk before

using this utility.

Recovering the BIOS

To recover the BIOS:

1. Turn on the system.

2. Insert the support DVD to the optical drive or the removable device that contains the
BIOS le to the USB port or to the oppy disk drive, if supported.

3. The utility automatically checks the devices for the BIOS le. When the BIOS le is
found, the utility reads it and starts ashing the corrupted BIOS le.

4. Turn off the system after the utility completes the updating process and turn it on again.

DO NOT shut down or reset the system while updating the BIOS! Doing so can cause
system boot failure!

Ensure to load the BIOS default settings to ensure system compatibility and stability. Select
the Load Setup Defaults item under the Exit menu. Refer to section 2.8 Exit menu for
details.

2-4 Chapter 2: BIOS information

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 <Ctrl>+<Alt>+<Delete> simultaneously.

• 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

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 that you always shut down the system properly from the operating system.

• The default BIOS settings for this motherboard apply to 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 Setup Defaults item under the Exit menu. See section 2.8 Exit Menu.

• The BIOS setup screens in this chapter are for reference only. They may not exactly
match what you see on your screen.

• Visit the ASUS website at www.asus.com to download the latest BIOS le for this
motherboard.

ASUS M4A77TD 2-5

2.2.1 BIOS menu screen

Menu items

Main Advanced Power Boot Tools Exit

Main Settings

System Time [19:34:30]

System Date [Fri 07/31/2009]

Primary IDE Master :[Not Detected]
Primary IDE Slave :[Not Detected]
SATA1 :[Not Detected]
SATA2 :[Not Detected]
SATA3 :[Not Detected]
SATA4 :[Not Detected]
SATA5 :[Not Detected]
SATA6 :[Not Detected]

SATA Conguration

System Information

Submenu items

Menu bar

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

Conguration elds

BIOS SETUP UTILITY

General help

Use [ENTER], [TAB]
or [SHIFT-TAB] to

select a eld.

Use [+] or [-] to

congure system

Time.

Select Screen

Select Item

Change Field

+-

Tab Select Field
F1 General Help
F10 Save and Exit
ESC Exit

Navigation keys

2.2.2 Menu bar

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

Main For changing the basic system conguration

Advanced For changing the advanced system settings

Power For changing the advanced power management (APM) conguration

Boot For changing the system boot conguration

Tools For conguring options for special functions

Exit For selecting the exit options and loading default settings.

To select an item on the menu bar, press the right or left arrow key on the keyboard until the
desired item is highlighted.

2.2.3 Navigation keys

At the bottom right corner of a menu screen are the navigation keys for that particular menu.
Use the navigation keys to select items in the menu and change the settings.

Some of the navigation keys differ from one screen to another.

2-6 Chapter 2: BIOS information

2.2.4 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 (Advanced, Power, Boot, Tools, and Exit) on the menu bar have their

respective menu items.

2.2.5 Submenu items

A solid triangle before each item on a menu screen means that the item has a submenu. To
display the submenu, select the item and press <Enter>.

2.2.6 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
user-congurable.

A congurable eld is enclosed in brackets, and is highlighted when selected. To change the
value of a eld, select it then press <Enter> to display a list of options. Refer to 2.2.7 Pop-up

window.

2.2.7 Pop-up window

Select a menu item then press <Enter>
to display a pop-up window with the

conguration options for that item.

2.2.8 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> /

Advanced

CPU Conguration

AGESA Version: 3.3.1.0

AMD Phenom(tm) II X4 945 Processor
Revision: C2
Cache L1: 512KB
Cache L2: 2048KB
Cache L3: 6MB
Speed : 3000MHz, NB Cl
HT Frequency : 2000MHz
Able to Change Freq. : Yes
uCode Patch Level : 0x1

GART Error Reporting [Disabled]

Microcode Updation [Enabled]
Secure Virtual Machine Mode [Disabled]
Cool ‘n‘ Quiet [Enalbed]
ACPI SRAT Table [Enabled]

C1E Conguration [Disabled]

Advanced Clock Calibration [Disabled]

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

BIOS SETUP UTILITY

Options
Disabled

Enabled

Pop-up window

Sets the ratio
between CPU Core
Clock and the FSB
Frequency.
NOTE: If an invalid
ratio is set in CMOS
then actual and
setpoint values may
differ.

Select Item
F1 General Help
F10 Save and Exit
ESC Exit

Scroll bar

<Down> arrow keys or <Page Up> /<Page
Down> keys to display the other items on

the screen.

2.2.9 General help

At the top right corner of the menu screen is a brief description of the selected item.

Select Screen

ASUS M4A77TD 2-7

2.3 Main menu

When you enter the BIOS Setup program, the Main menu screen appears, giving you an
overview of the basic system information.

Refer to section 2.2.1 BIOS menu screen for information on the menu screen items and
how to navigate through them.

Main Advanced Power Boot Tools Exit

Main Settings

System Time [19:34:30]

System Date [Fri 07/31/2009]

Primary IDE Master :[Not Detected]
Primary IDE Slave :[Not Detected]
SATA1 :[Not Detected]
SATA2 :[Not Detected]
SATA3 :[Not Detected]
SATA4 :[Not Detected]
SATA5 :[Not Detected]
SATA6 :[Not Detected]

SATA Conguration

System Information

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

BIOS SETUP UTILITY

Use [ENTER], [TAB]
or [SHIFT-TAB] to

select a eld.

Use [+] or [-] to

congure system

Time.

Select Screen

Select Item

Change Field

+-

Tab Select Field
F1 General Help
F10 Save and Exit
ESC Exit

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 Primary IDE Master/Slave, SATA 1/2/3/4/5/6

While entering Setup, the BIOS automatically detects the presence of IDE/SATA devices.
There is a separate submenu for each IDE/SATA device. Select a device item then press
<Enter> to display the IDE/SATA device information.

The BIOS automatically detects the values opposite the dimmed items (Device, Vendor, Size,

LBA Mode, Block Mode, PIO Mode, Async DMA, Ultra DMA, and SMART monitoring). These

values are not user-congurable. These items show Not Detected if no IDE/SATA device is

installed in the system.

Type [Auto]

Selects the type of IDE/SATA drive. Setting this item to [Auto] allows automatic selection of
the appropriate IDE device type. Select [CDROM] if you are specically conguring a CD-
ROM drive. Select [ARMD] (ATAPI Removable Media Device) if your device is either a ZIP,

LS-120, or MO drive. Conguration options: [Not Installed] [Auto] [CDROM] [ARMD]

This item only appears in the Primary IDE Master/Slave and SATA 5/6 menus.

2-8 Chapter 2: BIOS information

LBA/Large Mode [Auto]

Enables or disables the LBA mode. Setting this item to [Auto] enables the LBA mode if the
device supports this mode, and if the device was not previously formatted with LBA mode

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

Block (Multi-Sector Transfer) M [Auto]

Enables or disables data multi-sectors transfers. When this item is set to [Auto], the data
transfer from and to the device occurs multiple sectors at a time if the device supports multi­sector transfer feature. When this item is set to [Disabled], the data transfer from and to the

device occurs one sector at a time. Conguration options: [Disabled] [Auto]

PIO Mode [Auto]

Selects the PIO mode. Conguration options: [Auto] [0] [1] [2] [3] [4]

DMA Mode [Auto]

Selects the DMA mode. Conguration options: [Auto]

SMART Monitoring [Auto]

Sets the Smart Monitoring, Analysis, and Reporting Technology.

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

32Bit Data Transfer [Enabled]

Enables or disables 32-bit data transfer. Conguration options: [Disabled] [Enabled]

2.3.4 SATA Conguration

The SATA Conguration menu allows you to congure your storage devices. Select an item
then press <Enter> to display the submenu.

OnChip SATA Channel [Enabled]

Enables or disables the onboard channel SATA port. Conguration options: [Disabled]
[Enabled]

SATA Port1 – Port4 [IDE]

Congures SATA 1/2/3/4. Conguration options: [IDE] [RAID] [AHCI]

SATA Port5 – Port6 [IDE]

Congures SATA 5/6. Conguration options: [IDE] [RAID] [AHCI]

• When SATA 1/2/3/4 are congured as [IDE], SATA 5/6 can only be congured as [IDE].

• When SATA 1/2/3/4/5/6 are congured as [AHCI], only SATA 1/2/3/4 can be detected

under OS. Ensure to install the AHCI driver, so that you can use SATA 1/2/3/4/5/6 in

AHCI mode under OS.

• When SATA 1/2/3/4 are congured as [AHCI] and SATA 5/6 are congured as [IDE], you

can access the devices on SATA 5/6 before entering OS.

ASUS M4A77TD 2-9

2.3.5 System Information

This menu gives you an overview of the general system specications. The BIOS

automatically detects the items in this menu.

BIOS Information

Displays the auto-detected BIOS information.

Processor

Displays the auto-detected CPU specication.

System Memory

Displays the auto-detected system memory.

2.4 Advanced menu

The Advanced menu items allow you to change the settings for the CPU and other system
devices.

Take caution when changing the settings of the Advanced menu items. Incorrect eld

values can cause the system to malfunction.

Main Advanced Power Boot Tools Exit

Advanced Settings

JumperFree Conguration

CPU Conguration

Chipset

Onboard Devices Conguration

PCIPnP

USB Conguration

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

BIOS SETUP UTILITY

Adjust System
Frequency/Voltage etc.

Select Screen

Select Item
+- Change Field
Tab Select Field
F1 General Help
F10 Save and Exit
ESC Exit

2.4.1 JumperFree Conguration

The items and conguration options in this menu may vary depending on the AMD CPU

type.

Ai Overclock Tuner [Auto]

Selects the CPU overclocking options to achieve desired CPU internal frequency.

Conguration options: [Auto] [Manual] [Overclock Prole] [Test Mode]

2-10 Chapter 2: BIOS information

The following items only appear when you set Ai Overclock Tuner to [Manual].

CPU Bus Frequency [200]

Sets the CPU frequency. Conguration options: [Min.=200] [Max.=550]

PCIE Frequency

Sets the PCIe frequency. Conguration options: [Min.=100] [Max.=150]

The following item only appears when you set Ai Overclock Tuner to [Overclock Prole].

Overclock Options [Auto]

Selects the overclocking prole. Conguration options: [Auto] [Overclock 2%]
[Overclock 5%] [Overclock 8%] [Overclock 10%]

CPU Ratio [Auto]

Sets the ratio between the CPU Core Clock and the CPU Bus Frequency. Use the <+> / <->

keys to adjust the ratio. The valid value ranges vary depending on your CPU model.

CPU Over Voltage [Auto]

Sets the CPU over voltage. The valid value ranges vary depending on your CPU model. Use

<+> / <-> keys to adjust the ratio. Conguration options: [Auto]

VDDNB Over Voltage [Auto]

Sets the VDDNB over voltage. The valid value ranges vary depending on your CPU model.

Use <+> / <-> keys to adjust the ratio. Conguration options: [Auto]

LoadLine Calibration [Auto]

Sets LoadLine. The values range from 0% to 100% with a 3.225% increment. Use the <+> /
<-> keys to adjust the value. Conguration options: [Auto] [Max. = 100%] [Min. = 0%]

HT Link Speed [Auto]

Sets the HyperTransport link speed. Conguration options: [200MHz] [400MHz] [600MHz]
[800MHZ] [1000MHz] [1200MHz] [1400MHz] [1600MHz] [1800MHz] [2000MHz] [Auto]

HT Link Width [Auto]

Sets the HyperTransport link width. Conguration options: [Auto] [4 Bit] [8 Bit] [16 Bit]

HT Over Voltage [Auto]

Sets the HT over voltage. The values range from 1.25000V to 1.38500V with a 0.01500V
increment. Use the <+> / <-> keys to adjust the value. Conguration options: [Auto] [Max. =

1.38500V] [Min. = 1.25000V]

ASUS M4A77TD 2-11

DRAM Frequency [Auto]

Selects the DRAM frequency programming method. If this item is set to [Auto], the DRAM

speed depends on the SPDs. Conguration options: [Auto] [800MHz] [1067MHz] [1333MHz]
[1600MHz]

Memory Over Voltage [Auto]

Sets the memory over voltage. The values range from 1.5000V to 2.2050V with a 0.0150V
increment. Use the <+> / <-> keys to adjust the value. Conguration options: [Auto] [Max. =

2.2050V] [Min. = 1.5000V]

DRAM Timing/Driving Conguration

The conguration options for some of the following items vary depending on the DIMMs you

install on the motherboard.

DRAM Command Rate [Auto]

Conguration options: [Auto] [1T] [2T]

TCL [Auto]

Conguration options: [Auto] [4 CLK] ~ [12 CLK]

TRCD [Auto]

Conguration options: [Auto] [5 CLK] ~ [12 CLK]

TRP [Auto]

Conguration options: [Auto] [5 CLK] ~ [12 CLK]

TRAS [Auto]

Conguration options: [Auto] [15 CLK] ~ [30 CLK]

TRTP [Auto]

Conguration options: [Auto] [4 CLK] ~ [7 CLK]

TRC [Auto]

Conguration options: [Auto] [11 CLK] ~ [41 CLK]

TWR [Auto]

Conguration options: [Auto] [5 CLK] ~ [8 CLK] [10 CLK] [12 CLK]

TRRD [Auto]

Conguration options: [Auto] [4 CLK] ~ [7 CLK]

TRWTTO [Auto]

Conguration options: [Auto] [3 CLK] ~ [17 CLK]

TWRRD [Auto]

Conguration options: [Auto] [2 CLK] ~ [10 CLK]

TWTR [Auto]

Conguration options: [Auto] [4 CLK] ~ [7 CLK]

TWRWR [Auto]

Conguration options: [Auto] [3 CLK] ~ [10 CLK]

TRDRD [Auto]

Conguration options: [Auto] [3 CLK] ~ [10 CLK]

2-12 Chapter 2: BIOS information

TRFC0/TRFC1 [Auto]

Conguration options: [Auto] [90ns] [110ns] [160ns] [300ns] [350ns]

TREF [Auto]

Conguration options: [Auto] [Every 7.8ms] [Every 3.9ms]

DCT0:CKE drive strength/DCT1:CKE drive strength [Auto]

Conguration options: [Auto] [1x] [1.25x] [1.5x] [2x]

DCT0:CS/ODT drive strength/DCT1:CS/ODT drive strength [Auto]

Conguration options: [Auto] [1x] [1.25x] [1.5x] [2x]

DCT0:ADDR/CMD drive strength/DCT1:ADDR/CMD drive strength [Auto]

Conguration options: [Auto] [1x] [1.25x] [1.5x] [2x]

DCT0:MEMCLK drive strength/DCT1:MEMCLK drive strength [Auto]

Conguration options: [Auto] [0.75x] [1x] [1.25x] [1.5x]

DCT0:Data drive strength/DCT1:Data drive strength [Auto]

Conguration options: [Auto] [0.75x] [1x] [1.25x] [1.5x]

DCT0:DQS drive strength/DCT1:DQS drive strength [Auto]

Conguration options: [Auto] [0.75x] [1x] [1.25x] [1.5x]

DCT0:Processor ODT/DCT1:Processor ODT [Auto]

Conguration options: [Auto] [240 ohms +/- 20%] [120 ohms +/- 20%]
[60 ohms +/- 20%]

Chipset Over Voltage [Auto]

Sets the chipset over voltage. The values range from 1.10000V to 1.25000V with a 0.01500V
increment. Use the <+> / <-> keys to adjust the value. Conguration options: [Auto]
[Max. = 1.25000V] [Min. = 1.10000V]

2.4.2 CPU Conguration

The items in this menu show the CPU-related information that the BIOS automatically
detects.

GART Error Reporting [Disabled]

This option should remain disabled for the normal operation. The driver developer may

enable it for testing purpose. Conguration options: [Disabled] [Enabled]

Microcode Updation [Enabled]

Enables or disables Microcode Updation. Conguration options: [Disabled] [Enabled]

Secure Virtual Machine Mode [Disabled]

Enables or disables Secure Virtual Machine Mode (SVM). Conguration options: [Disabled]
[Enabled]

Cool ‘n’ Quiet [Enabled]

Enables or disables the AMD® Cool ‘n’ Quiet technology. Conguration options: [Enabled]

[Disabled]

ACPI SRAT Table [Enabled]

Enables or disables the building of ACPI SRAT table. Conguration options: [Enabled]
[Disabled]

ASUS M4A77TD 2-13

C1E Conguration [Disabled]

Enables or disables the CPU Enhanced Halt (C1E) function, a CPU power-saving function
in system halt state. When this item is enabled, the CPU core frequency and voltage will be
reduced during the system halt state to decrease power consumption.

Conguration options: [Disabled] [Enabled]

Advanced Clock Calibration [Disabled]

Adjusts the processor’s overclocking capability. When this item is set to [Auto], the BIOS
automatically adjusts this function. When this item is set to [All Cores], the processor has
the best overclocking performance. When this item is set to [Per Core], the processor’s

overclocking capability is enhanced. Conguration options: [Disabled] [Auto] [All Cores]
[Per Core]

2.4.3 Chipset

NorthBridge Conguration

DRAM Controller Conguration

Bank Interleaving [Auto]

Allows you to enable the bank memory interleaving. Conguration options: [Disabled]
[Auto]

Channel Interleaving [XOR of Address bit]

Allows you to enable the channel memory interleaving.

Conguration options: [Disabled] [Address bits 6] [Address bits 12]
[XOR of Address bits [20:16, 6]] [XOR of Address bits [20:16, 9]]

MemClk Tristate C3/ATLVID [Disabled]

Allows you to enable or disable MemClk Tri-Stating during C3 and Alt VID.

Conguration options: [Disabled] [Enabled]

Memory Hole Remapping [Enabled]

Allows you to enable or disable memory remapping around memory hole.

Conguration options: [Disabled] [Enabled]

DCT Unganged Mode [Always]

Allows you to select the unganged DRAM mode (64-bit width).

Conguration options: [Auto] [Always]

Power Down Enable [Disabled]

Allows you to enable or disable DDR power down mode.

Conguration options: [Disabled] [Enabled]

ECC Conguration

ECC Mode [Disabled]

Allows you to set the ECC mode. Conguration options: [Disabled] [Basic] [Good]
[Super] [Max] [User]

2-14 Chapter 2: BIOS information

Primary Display Adapter [GFX-GPP-PCI]

Selects the primary display adapter. Conguration options: [GFX-GPP-PCI] [GPP-GFX-PCI]
[PCI-GFX-GPP]

GFX: primary display adapter on the PCIe x16 slot
GPP: primary display adapter on the PCIe x1 slot
PCI: primary display adapter on the PCI slot

2.4.4 Onboard Device Conguration

Serial Port1 Address [3F8/IRQ4]

Allows you to select the Serial Port1 base address. Conguration options: [Disabled]
[3F8/IRQ4][2F8/IRQ3] [3E8/IRQ4] [2E8/IRQ3]

Parallel Port Address [378]

Allows you to select the Parallel Port base addresses. Conguration options: [Disabled] [378]
[278] [3BC]

Parallel Port Mode [Normal]

Allows you to select the Parallel Port mode. Conguration options: [Normal] [EPP] [ECP]
[EPP+ECP]

Parallel Port IRQ [IRQ7]

Conguration options: [IRQ5] [IRQ7]

HDAudio Controller [Enabled]

Enables or disables the high denition audio controller. Conguration options: [Enabled]
[Disabled]

Front Panel Select [HD Audio]

Conguration options: [HD Audio] [AC97]

OnBoard LAN Controller [Enabled]

Conguration options: [Enabled] [Disabled]

OnBoard LAN Boot ROM [Disabled]

Conguration options: [Disabled] [Enabled]

2.4.5 PCIPnP

The PCI PnP menu items allow you to change the advanced settings for PCI/PnP devices.
The menu includes setting IRQ and DMA channel resources for either PCI/PnP or legacy ISA
devices, and setting the memory size block for legacy ISA devices.

Take caution when changing the settings of the PCI PnP menu items. Incorrect eld values

can cause the system to malfunction.

Plug and Play O/S [No]

When this item is set to [No], BIOS congures all the devices in the system. When this item
is set to [Yes] and if you install a Plug and Play operating system, the operating system

congures the Plug and Play devices not required for boot. Conguration options: [No] [Yes]

ASUS M4A77TD 2-15

2.4.6 USB Conguration

The items in this menu allows you to change the USB-related features. Select an item then
press <Enter> to display the conguration options.

The Module Version and USB Devices Enabled items show the auto-detected values. If no
USB device is detected, the item shows None.

USB Functions [Enabled]

Allows you to enable or disable the USB functions. Conguration options: [Disabled]
[Enabled]

USB 2.0 Controller [Enabled]

Enables or disables USB 2.0 Controllers. Conguration options: [Disabled] [Enabled]

Legacy USB Support [Auto]

Allows you to enable or disable support for Legacy USB storage devices, including USB ash

drives and USB hard drives. Setting to 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. Conguration options: [Disabled] [Enabled]
[Auto]

USB 2.0 Controller Mode [HiSpeed]

Allows you to congure the USB 2.0 controller in HiSpeed (480Mbps) or Full Speed
(12Mbps). Conguration options: [FullSpeed] [HiSpeed]

The following items only appear when a USB storage device is plugged in.

USB Mass Storage Device Conguration

USB Mass Storage Reset Delay [20 Sec]

Sets the maximum time that the BIOS waits for the USB storage device to initialize.
Conguration options: [10 Sec] [20 Sec] [30 Sec] [40 Sec]

Emulation Type [Auto]

Allows you to set the emulation type. Conguration options: [Auto] [Floppy]
[Forced FDD] [Hard Disk] [CDROM]

2-16 Chapter 2: BIOS information

2.5 Power menu

The Power menu items allow you to change the settings for the Advanced Conguration and

Power Interface (ACPI) and the Advanced Power Management (APM). Select an item then
press <Enter> to display the conguration options.

Main Advanced Power Boot Tools Exit

Power Settings

Suspend Mode [Auto]

ACPI 2.0 Support [Enabled] ACPI APIC Support [Enabled]

APM Conguration
HW Monitor Conguration

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

2.5.1 Suspend Mode [Auto]

Allows you to select the Advanced Conguration and Power Interface (ACPI) state to be used
for system suspend. Conguration options: [S1 (POS) Only] [S3 Only] [Auto]

2.5.2 ACPI 2.0 Support [Enabled]

Allows you to enable or disable the Advanced Conguration and Power Interface (ACPI) 2.0
support. Conguration options: [Disabled] [Enabled]

2.5.3 ACPI APIC Support [Enabled]

Allows you to enable or disable the Advanced Conguration and Power Interface (ACPI)

support in the Advanced Programmable Interrupt Controller (APIC). When set to Enabled, the

ACPI APIC table pointer is included in the RSDT pointer list. Conguration options: [Disabled]
[Enabled]

BIOS SETUP UTILITY

Select the ACPI state
used for System
Suspend.

Select Screen

Select Item
+- Change Option
F1 General Help
F10 Save and Exit
ESC Exit

2.5.4 APM Conguration

Restore on AC Power Loss [Always Off]

When this item is set to [Always Off], the system goes into off state after an AC power
loss. When this item is set to [Always On], the system goes on after an AC power loss.

Conguration options: [Always Off] [Always On] [Last State]

Power on From S5 By PME# [Disabled]

Enables or disables PME wake from sleep states. Conguration options: [Disabled] [Enabled]

Power on From S5 By Ring [Disabled]

Enables or disables ring to generate a wake event. Conguration options: [Disabled]
[Enabled]

ASUS M4A77TD 2-17

Power on From S5 By PS/2 Keyboard [Disabled]

Enables or disables PS/2 Keyboard to generate a wake event.
Conguration options: [Disabled] [Enabled]

Power on From S5 By RTC Alarm [Disabled]

Enables or disables RTC to generate a wake event. Conguration options: [Disabled]
[Enabled]

2.5.5 HW Monitor Conguration

CPU Temperature [xxxºC/xxxºF] or [Ignored]
MB Temperature [xxxºC/xxxºF] or [Ignored]

The onboard hardware monitor automatically detects and displays the motherboard and CPU
temperatures. Select Ignored if you do not wish to display the detected temperatures.

CPU / Chassis Fan Speed [N/A], [xxxxRPM], or [Ignored]

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 [gnored] if you do not want the detected speed to be displayed.

VCORE Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage [xx.xxxV] or [Ignored]

The onboard hardware monitor automatically detects the voltage output through the onboard
voltage regulators.

Smart Q-Fan Function [Enabled]

Enables or disables the ASUS Q-Fan feature that smartly adjusts the CPU fan speeds for

more efcient system operation. Conguration options: [Disabled] [Enabled]

Fan Auto Mode Start Voltage [5.0V]

Selects the fan auto mode start voltage. Conguration options: [4.0V] [4.5V] [5.0V] [5.5V]
[6.0V]

Fan Auto Mode Start Speed Temp [25ºC]

Sets the smart Q-Fan start working temperature. Conguration options: [25ºC] ~ [48ºC]

Fan Auto Mode Full Speed Temp [55ºC]

Sets the smart Q-Fan full speed temperature. Conguration options: [51ºC] ~ [75ºC]

2-18 Chapter 2: BIOS information

2.6 Boot menu

The Boot menu items allow you to change the system boot options. Select an item then
press <Enter> to display the sub-menu.

Main Advanced Power Boot Tools Exit

Boot Settings

Boot Device Priority

Boot Settings Conguration

Security

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

2.6.1 Boot Device Priority

1st ~ xxth Boot Device

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. Conguration 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:

• Press <F5> when ASUS logo appears.

• Press <F8> after POST.

BIOS SETUP UTILITY

Species the Boot

Device Priority
sequence.

A virtual oppy disk

drive (Floppy Drive B:)
may appear when you set
the CD-ROM drive as the

rst boot device.

Select Screen

Select Item
Enter Go to Sub Screen
F1 General Help
F10 Save and Exit
ESC Exit

ASUS M4A77TD 2-19

2.6.2 Boot Settings Conguration

Quick Boot [Enabled]

Enabling this item allows the BIOS to skip some power on self tests (POST) while booting
to decrease the time needed to boot the system. When this item is set to [Disabled], BIOS

performs all the POST items. Conguration options: [Disabled] [Enabled]

Full Screen Logo [Enabled]

Enables or disables the full screen logo display feature. Conguration 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. Conguration options: [Force BIOS] [Keep Current]

Bootup Num-Lock [On]

Selects the power-on state for the NumLock. Conguration options: [Off] [On]

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]

Hit ‘DEL’ Message Display [Enabled]

When this item is set to [Enabled], the system displays the message Press DEL to run
Setup during POST. Conguration options: [Disabled] [Enabled]

2-20 Chapter 2: BIOS information

2.6.3 Security

The Security menu items allow you to change the system security settings. Select
an item then press <Enter> to display the conguration options.

Change Supervisor Password

Select this item to set or change the supervisor password. The Supervisor Password item
on top of the screen shows the default Not Installed. After you set a password, this item
shows Installed.

To set a Supervisor Password:

1. Select the Change Supervisor Password item and press <Enter>.

2. In the password box, key in a password containing up to six letters and/or numbers,

then press <Enter>.

3. Conrm the password when prompted.

The message Password Installed appears after you successfully set your password.

To change the supervisor password, follow the same steps as in setting a supervisor
password.

To clear the supervisor password, select the Change Supervisor Password then press
<Enter> twice. The message Password uninstalled appears.

If you forget your BIOS password, you can clear it by erasing the CMOS Real Time Clock
(RTC) RAM. See section 1.9 Jumpers for information on how to erase the RTC RAM.

After you have set a supervisor password, the other items appear to allow you to change
other security settings.

User Access Level [Full Access]

This item allows you to select the access restriction to the Setup items. Conguration options:
[No Access] [View Only] [Limited] [Full Access]

No Access prevents user access to the Setup utility.
View Only allows access but does not allow change to any eld.
Limited allows changes only to selected elds, such as Date and Time.
Full Access allows viewing and changing all the elds in the Setup utility.

ASUS M4A77TD 2-21

Change User Password

Select this item to set or change the user password. 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 Change User Password item and press <Enter>.

2. In the password box, key in a password containing up to six letters and/or numbers,

then press <Enter>.

3. Conrm the password when prompted.

The message “Password Installed” appears after you set your password successfully.

To change the user password, follow the same steps as in setting a user password.

Clear User Password

Select this item to clear the user password.

Password Check [Setup]

When set to [Setup], BIOS checks for user password when accessing the Setup utility. When
set to [Always], BIOS checks for user password both when accessing Setup and booting the

system. Conguration options: [Setup] [Always]

2.7 Tools menu

The Tools menu items allow you to congure options for special functions. Select an item
then press <Enter> to display the sub-menu.

Main Advanced Power Boot Tools Exit

ASUS EZ Flash 2

Express Gate [Auto]
Enter OS Timer [10 Seconds]
Reset User Data [No]

AI NET2

BIOS SETUP UTILITY

Press ENTER to run
the utility to select
and update BIOS. This
utility supports:

1.FAT 12/16/32 (r/w)

2.NTFS (read only)

3.CD-DISC (read only)

Select Screen

Select Item

Enter Go to Sub
Screen
F1 General Help
F10 Save and Exit
ESC Exit

v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.

2-22 Chapter 2: BIOS information

2.7.1 ASUS EZ Flash 2

Allows you to run ASUS EZ Flash 2. When you press <Enter>, a conrmation message
appears. Use the left/right arrow key to select between [Yes] or [No], then press <Enter> to
conrm your choice.

2.7.2 Express Gate [Auto]

Allows you to enable or disable the ASUS Express Gate feature. ASUS Express Gate is
a unique instant-on environment that provides quick access to the Internet and Skype.

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

Enter OS Timer [10 Seconds]

Sets countdown duration that the system waits at the Express Gate’s rst screen

before starting Windows or other installed OS. Choose [Prompt User] to stay at the

rst screen of Express Gate for user action. Conguration options: [Prompt User]
[1 second] [3 seconds] [5 seconds] [10 seconds] [15 seconds] [20 seconds]
[30 seconds]

Reset User Data [No]

Allows you to clear Express Gate’s user data. Conguration options: [No] [Reset]

When setting this item to [Reset], ensure to save the setting to the BIOS so that the
user data will be cleared the next time you enter the Express Gate. User data includes

the Express Gate’s settings as well as any personal information stored by the web

browser (bookmarks, cookies, browsing history, etc.). This is useful in the rare case
where corrupt settings prevent the Express Gate environment from launching properly.

The rst time wizard will run again when you enter the Express Gate environment after

clearing its settings.

2.7.3 AI NET 2

Check Realtek LAN cable [Disabled]

Enables or disables checking of the Realtek LAN cable during the Power-On Self-Test

(POST). Conguration options: [Disabled] [Enabled]

ASUS M4A77TD 2-23

2.8 Exit menu

Exit system setup
after saving the
changes.

F10 key can be used
for this operation.

The Exit menu items allow you to load the optimal or failsafe default values for the BIOS
items, and save or discard your changes to the BIOS items.

Main Advanced Power Boot Tools Exit

Exit Options

Exit & Save Changes

Exit & Discard Changes
Discard Changes

Load Setup Defaults

Pressing <Esc> does not immediately exit this menu. Select one of the options from this
menu or <F10> from the legend bar to exit.

Exit & Save Changes

Once you are nished making your selections, choose this option from the Exit menu to

ensure the values you selected are saved to the CMOS RAM. An onboard backup battery
sustains the CMOS RAM so it stays on even when the PC is turned off. When you select this

option, a conrmation window appears. Select OK to save changes and exit.

Exit & Discard Changes

Select this option only if you do not want to save the changes that you made to the Setup

program. If you made changes to elds other than System Date, System Time, and
Password, the BIOS asks for a conrmation before exiting.

Discard Changes

This option allows you to discard the selections you made and restore the previously saved
values. After selecting this option, a conrmation appears. Select OK to discard any changes
and load the previously saved values.

Load Setup 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 OK to load default values. Select Exit & Save Changes or make other changes
before saving the values to the non-volatile RAM.

BIOS SETUP UTILITY

2-24 Chapter 2: BIOS information