Asus P5GD1-FM User manual

Motherboard
P5GD1-FM

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Copyright © 2004 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, modified or
altered, unless such repair, modification of alteration is authorized in writing by ASUS; or (2)
the serial number of the product is defaced or missing.
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 identification or
explanation and to the owners’ benefit, without intent to infringe.
E1798E1798
E1798E1798
E1798
First EditionFirst Edition
First EditionFirst Edition
First Edition
October 2004October 2004
October 2004October 2004
October 2004

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Contents
Notices ............................................................................................ 1-vi
Safety information .......................................................................... 1-vii
P5GD1-FM specifications summary ................................................ 1-viii
Chapter 1:Chapter 1:
Chapter 1:Chapter 1:
Chapter 1: Product introductionProduct introduction
Product introductionProduct introduction
Product introduction
1.1 Before you proceed .............................................................. 1-2
1.2 Motherboard overview .......................................................... 1-3
1.2.1 Placement direction ................................................ 1-3
1.2.2 Screw holes ............................................................ 1-3
1.2.3 Motherboard layout ................................................ 1-4
1.3 Central Processing Unit (CPU) .............................................. 1-5
1.3.1 Installing the CPU.................................................... 1-5
1.3.2 Installing the CPU heatsink and fan ........................ 1-8
1.3.3 Uninstalling the CPU heatsink and fan .................. 1-10
1.4 System memory ................................................................. 1-12
1.4.1 DIMM sockets location .......................................... 1-12
1.4.2 Memory Configurations ......................................... 1-12
1.4.3 Installing a DIMM ................................................... 1-14
1.4.4 Removing a DIMM ................................................. 1-14
1.5 Expansion slots ................................................................... 1-15
1.5.1 Installing an expansion card .................................. 1-15
1.5.2 Configuring an expansion card.............................. 1-15
1.5.3 Interrupt assignments .......................................... 1-16
1.5.4 PCI slots ................................................................ 1-17
1.5.5 PCI Express x16 slot ............................................. 1-17
1.6 Jumpers .............................................................................. 1-18
1.7 Connectors ......................................................................... 1-22
1.7.1 Rear panel connectors .......................................... 1-22
1.7.2 Internal connectors............................................... 1-23

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Contents
Chapter 2:Chapter 2:
Chapter 2:Chapter 2:
Chapter 2: BIOS SetupBIOS Setup
BIOS SetupBIOS Setup
BIOS Setup
2.1 Managing and updating your BIOS ........................................ 2-2
2.1.1 Creating a bootable floppy disk .............................. 2-2
2.1.2 AFUDOS utility ........................................................ 2-3
2.1.3 ASUS EZ Flash utility .............................................. 2-5
2.1.4 ASUS CrashFree BIOS 2 utility ................................ 2-7
2.2 BIOS setup program ............................................................. 2-9
2.2.1 BIOS menu screen ................................................. 2-10
2.2.2 Menu bar ............................................................... 2-10
2.2.3 Navigation keys .................................................... 2-10
2.2.4 Menu items ........................................................... 2-11
2.2.5 Sub-menu items ................................................... 2-11
2.2.6 Configuration fields .............................................. 2-11
2.2.7 Pop-up window ..................................................... 2-11
2.2.8 Scroll bar .............................................................. 2-11
2.2.9 General help .......................................................... 2-11
2.3 Main menu .......................................................................... 2-12
2.3.1 System Time ......................................................... 2-12
2.3.2 System Date ......................................................... 2-12
2.3.3 Legacy Diskette A ................................................ 2-12
2.3.4 Primary, Third, and Fourth IDE Master/Slave ........ 2-13
2.3.5 IDE Configuration .................................................. 2-14
2.3.6 System Information .............................................. 2-15
2.4 Advanced menu .................................................................. 2-16
2.4.1 USB Configuration ................................................. 2-16
2.4.2 CPU Configuration ................................................. 2-17
2.4.3 Chipset ................................................................. 2-19
2.4.4 Onboard Devices Configuration ............................ 2-21
2.4.5 PCI PnP ................................................................. 2-22

vv
vv
v
Contents
2.5 Power menu ........................................................................ 2-24
2.5.1 ACPI Aware O/S .................................................... 2-24
2.5.2 Suspend Mode ...................................................... 2-24
2.5.3 Repost Video on S3 Resume ................................ 2-24
2.5.4 ACPI 2.0 Support .................................................. 2-24
2.5.5 ACPI APIC Support ................................................ 2-24
2.5.6 APM Configuration ................................................ 2-25
2.5.7 Hardware Monitor ................................................. 2-26
2.6.1 Boot Device Priority .............................................. 2-28
2.6 Boot menu .......................................................................... 2-28
2.6.2 Boot Settings Configuration ................................. 2-29
2.6.3 Security ................................................................ 2-30
2.7 Exit menu ........................................................................... 2-32

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Notices
Federal Communications Commission StatementFederal Communications Commission Statement
Federal Communications Commission StatementFederal Communications Commission Statement
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.
Canadian Department of Communications StatementCanadian Department of Communications Statement
Canadian Department of Communications StatementCanadian Department of Communications Statement
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 CanadianThis class B digital apparatus complies with Canadian
This class B digital apparatus complies with CanadianThis class B digital apparatus complies with Canadian
This class B digital apparatus complies with Canadian
ICES-003.ICES-003.
ICES-003.ICES-003.
ICES-003.
The use of shielded cables for connection of the monitor to the graphics
card is required to assure compliance with FCC regulations. Changes or
modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate
this equipment.

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Safety information
Electrical safetyElectrical safety
Electrical safetyElectrical safety
Electrical safety
•
To prevent electrical shock hazard, disconnect the power cable from
the electrical outlet before relocating the system.
•
When adding or removing devices to or from the system, ensure that
the power cables for the devices are unplugged before the signal cables
are connected. If possible, disconnect all power cables from the existing
system before you add a device.
•
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.
•
Make sure 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 fix it by yourself. Contact a
qualified service technician or your retailer.
Operation safetyOperation safety
Operation safetyOperation safety
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, make sure 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.
•
Place the product on a stable surface.
•
If you encounter technical problems with the product, contact a qualified
service technician or your retailer.

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P5GD1-FM specifications summary
(continued on the next page)
CPUCPU
CPUCPU
CPU
ChipsetChipset
ChipsetChipset
Chipset
Front Side BusFront Side Bus
Front Side BusFront Side Bus
Front Side Bus
MemoryMemory
MemoryMemory
Memory
Expansion slotsExpansion slots
Expansion slotsExpansion slots
Expansion slots
StorageStorage
StorageStorage
Storage
High DefinitionHigh Definition
High DefinitionHigh Definition
High Definition
AudioAudio
AudioAudio
Audio
LANLAN
LANLAN
LAN
USBUSB
USBUSB
USB
IEEE 1394IEEE 1394
IEEE 1394IEEE 1394
IEEE 1394
BIOS featuresBIOS features
BIOS featuresBIOS features
BIOS features
Rear panelRear panel
Rear panelRear panel
Rear panel
LGA775 socket for Intel
®
Pentium
®
4/Celeron processor
Compatible with Intel
®
Performance Universal FMB 2005
processors
Supports Intel
®
Hyper-Threading Technology
Northbridge: Intel
®
915P Memory and Controller Hub (MCH)
Southbridge: Intel
®
82801FB ICH6
800/533 MHz
4 x 184-pin DIMM sockets support unbufferred non-ECC
400/333 MHz DDR memory modules
1 x PCI Express x16 slot for discrete graphics card
3 x PCI slots
Intel
®
ICH6 Southbridge supports:
- 2 x Ultra ATA 100/66/33 hard disk drives
- 4 x Serial ATA hard disk drives
Realtek
®
ALC861 8-channel CODEC with Jack-sensing
and Universal Audio Jack (UAJ
®
) technology
1 x Optical S/PDIF out port
Realtek
®
RTL8101L LAN controller
Supports up to 8 USB 2.0 ports
T1 controller supports:
- 2 x IEEE 1394a ports
4 MB FWH, AMI BIOS, Green, PnP, DMI2.0, WfM2.0,
ACPI 2.0a, SM BIOS 2.3
1 x Serial port
1 x Optical S/PDIF out port
1 x IEEE 1394a port
1 x LAN (RJ-45) port
4 x USB 2.0 ports
8-channel audio ports

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1 x Floppy disk drive connector
1 x Primary IDE connector
4 x Serial ATA connectors
1 x CPU fan connector
1 x Chassis fan connector
2 x USB 2.0 connectors
1 x 24-pin ATX power connector
1 x 4-pin ATX 12 V power connector
1 x Front panel audio connector
1 x IEEE 1394a port
1 x Optical drive audio connector
1 x System panel connector
ATX power supply (with 24-pin and 4-pin 12 V plugs)
ATX 12 V 2.0 compliant
Micro ATX form factor: 9.6 in x 9.6 in (24.5 cm x 24.5 cm)
P5GD1-FM specifications summary
*Specifications are subject to change without notice.
InternalInternal
InternalInternal
Internal
connectorsconnectors
connectorsconnectors
connectors
PowerPower
PowerPower
Power
requirementrequirement
requirementrequirement
requirement
Form factorForm factor
Form factorForm factor
Form factor

xx
xx
x

1
Product
introduction
This chapter describes the motherboard
features and the new technologies
it supports.

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1-2 Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introduction
Onboard LEDOnboard LED
Onboard LEDOnboard LED
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.
1.1 Before you proceed
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.
• Use a grounded wrist strap or touch a safely grounded object or a
metal object, such as the power supply case, before handling
components 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, ensureBefore you install or remove any component, ensure
Before you install or remove any component, ensureBefore you install or remove any component, ensure
Before you install or remove any component, ensure
that the ATX power supply is switched off or thethat the ATX power supply is switched off or the
that the ATX power supply is switched off or thethat the ATX power supply is switched off or the
that the ATX power supply is switched off or the
power cord is detached from the power supply.power cord is detached from the power supply.
power cord is detached from the power supply.power cord is detached from the power supply.
power cord is detached from the power supply. Failure
to do so may cause severe damage to the motherboard, peripherals,
and/or components.
P5GD1-FM
®
P5GD1-FM Onboard LED
SB_PWR1
ON
Standby
Power
OFF
Powered
Off

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ASUS P5GD1-FM 1-31-3
1-31-3
1-3
P5GD1-FM
®
Do not overtighten the screws! Doing so can damage the motherboard.
Place this side towardsPlace this side towards
Place this side towardsPlace this side towards
Place this side towards
the rear of the chassisthe rear of the chassis
the rear of the chassisthe rear of the chassis
the rear of the chassis
Make sure to unplug the power cord before installing or removing the
motherboard. Failure to do so can cause you physical injury and damage
motherboard components.
1.2.11.2.1
1.2.11.2.1
1.2.1 Placement directionPlacement direction
Placement directionPlacement direction
Placement direction
When installaing the motherboard, make sure 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.
1.2.21.2.2
1.2.21.2.2
1.2.2 Screw holesScrew holes
Screw holesScrew holes
Screw holes
Place eight (8) screws into the holes indicated by circles to secure the
motherboard to the chassis.
1.2 Motherboard overview
Before you install the motherboard, study the configuration of your chassis
to ensure that the motherboard fits into it. Refer to the chassis
documentation before installing the mothebroard.

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1-4 Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introduction
1.2.31.2.3
1.2.31.2.3
1.2.3 Motherboard layoutMotherboard layout
Motherboard layoutMotherboard layout
Motherboard layout
Below:
Center/Subwoofer
Center:
Side Speaker Out
Top:Rear Speaker Out
P5GD1-FM
CR2032 3V
Lithium Cell
CMOS Power
CD1
Super
I/O
Intel FWH
4Mb
ATX12V1
FLOPPY1
AAFP1
DDR DIMM_A1 (64 bit,240-pin module)
SB_PWR1
USBPW34
USBPW12
F_PANEL1
IE1394_2 USB78USB56
USBPW78
USBPW56
CLRTC1
SATA1
PCI1
Intel
915P
MCH
Intel
ICH6
DDR DIMM_A2 (64 bit,240-pin module)
DDR DIMM_B1 (64 bit,240-pin module)
DDR DIMM_B2 (64 bit,240-pin module)
CHA_FAN1
CPU_FAN1
PRI_IDE1
ALC861
EATXPWR1
SATA3
SATA2
SATA4
RTL8101L
R
LAN_USB34
PCIEX16
BUZZ1
®
PCI2
PCI3
Below:Mic In
Center:Line Out
Top:Line In
LGA775
COM1
SPDIF_O2
F_USB12
TI
TSB43AB22A
BIOS_R
BIOS_S

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1-5
1.3.11.3.1
1.3.11.3.1
1.3.1 Installing the CPUInstalling the CPU
Installing the CPUInstalling the CPU
Installing the CPU
To install a CPU:
1. Locate the CPU socket on the motherboard.
1.3 Central Processing Unit (CPU)
The motherboard comes with a surface mount LGA775 socket designed for
the Intel
®
Pentium
®
4 processor in the 775-land package.
Before installing the CPU, make sure that the socket box is facing
towards you and the load lever is on your left.
• Your boxed Intel
®
Pentium
®
4 LGA775 processor package 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.
•
Upon purchase of the motherboard, make sure that the PnP cap is
on the socket and the socket contacts are not bent. Contact your
retailer immediately if the PnP cap is missing, or if you see any
damage to the PnP cap/socket contacts/motherboard components.
ASUS will shoulder the cost of repair only if the damage is shipment/
transit-related.
•
Keep the cap after installing the motherboard. ASUS will process
Return Merchandise Authorization (RMA) requests only if the
motherboard comes with the cap on the LGA775 socket.
• The product warranty does not cover damage to the socket
contacts resulting from incorrect CPU installation/removal, or
misplacement/loss/incorrect removal of the PnP cap.
P5GD1-FM
®
P5GD1-FM Socket 775

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1-6 Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introduction
3. Lift the load lever in the
direction of the arrow to a 135º
angle.
4. Lift the load plate with your
thumb and forefinger to a
100º angle (A), then push
the PnP cap from the load
plate window to remove (B).
To prevent damage to the socket pins, do not remove the PnP cap
unless you are installing a CPU.
5. Position the CPU over
the socket, making
sure that the gold
triangle is on the
bottom-left corner of
the socket. The
socket alignment key
should fit into the
CPU notch.
Alignment keyAlignment key
Alignment keyAlignment key
Alignment key
Gold triangle markGold triangle mark
Gold triangle markGold triangle mark
Gold triangle mark
Load plateLoad plate
Load plateLoad plate
Load plate
A
B
2. Press the load lever with your thumb (A), then move it to the left (B)
until it is released from the retention tab.
Retention tabRetention tab
Retention tabRetention tab
Retention tab
Load leverLoad lever
Load leverLoad lever
Load lever
This side of theThis side of the
This side of theThis side of the
This side of the
socket box shouldsocket box should
socket box shouldsocket box should
socket box should
face you.face you.
face you.face you.
face you.
PnP capPnP cap
PnP capPnP cap
PnP cap
A
B

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1-7
Notes on IntelNotes on Intel
Notes on IntelNotes on Intel
Notes on Intel
®
Hyper-Threading TechnologyHyper-Threading Technology
Hyper-Threading TechnologyHyper-Threading Technology
Hyper-Threading Technology
• This motherboard supports Intel
®
Pentium
®
4 CPUs in the 775-land
package with Hyper-Threading Technology.
• Hyper-Threading Technology is supported under Windows
®
XP/2003
Server and Linux 2.4.x (kernel) and later versions only. Under Linux,
use the Hyper-Threading compiler to compile the code. If you are
using any other operating systems, disable the Hyper-Threading
Techonology item in the BIOS to ensure system stability and
performance.
• Installing Windows
®
XP Service Pack 1 or later version is recommended.
• Make sure to enable the Hyper-Threading Technology item in BIOS
before installing a supported operating system.
• For more information on Hyper-Threading Technology, visit
www.intel.com/info/hyperthreading.
To use the Hyper-Threading Technology on this motherboard:
1. Install an Intel
®
Pentium
®
4 CPU that supports Hyper-Threading
Technology.
2. Power up the system and enter the BIOS Setup (see Chapter 2: BIOS
setup). Under the Advanced Menu, make sure that the item
Hyper-Threading Technology is set to Enabled. The item appears only
if you installed a CPU that supports Hyper-Threading Techonology.
3. Reboot the computer.
The CPU fits in only one correct orientation. DO NOT force the CPU into
the socket to prevent bending the connectors on the socket and
damaging the CPU!
6. Close the load plate (A), then
push the load lever (B) until
it snaps into the retention
tab.
A
B

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1-8 Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introduction
FastenerFastener
FastenerFastener
Fastener
Motherboard holeMotherboard hole
Motherboard holeMotherboard hole
Motherboard hole
1.3.21.3.2
1.3.21.3.2
1.3.2 Installing the CPU heatsink and fanInstalling the CPU heatsink and fan
Installing the CPU heatsink and fanInstalling the CPU heatsink and fan
Installing the CPU heatsink and fan
The Intel
®
Pentium
®
4 LGA775 processor requires a specially designed
heatsink and fan assembly to ensure optimum thermal condition and
performance.
•
When you buy a boxed Intel
®
Pentium
®
4 processor, the package
includes the CPU fan and heatsink assembly. If you buy a CPU
separately, make sure that you use only Intel
®
-certified
multi-directional heatsink and fan.
•
Your Intel
®
Pentium
®
4 LGA775 heatsink and fan assembly comes in
a push-pin design and requires no tool to install.
•
If you purchased a separate CPU heatsink and fan assembly, make
sure that you have properly applied Thermal Interface Material to the
CPU heatsink or CPU before you install the heatsink and fan
assembly.
Make sure to orient each fastener with the narrow end of the groove
pointing outward. (The photo shows the groove shaded for emphasis.)
To install the CPU heatsink and fan:
1. Place the heatsink on top of the
installed CPU, making sure that
the four fasteners match the
holes on the motherboard.
Narrow endNarrow end
Narrow endNarrow end
Narrow end
of the grooveof the groove
of the grooveof the groove
of the groove
Make sure that you have installed the motherboard to the chassis before
you install the CPU fan and heatsink assembly.
Orient the heatsink and fan
assembly such that the CPU
fan cable is closest to the
CPU fan connector.

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3. Connect the CPU fan cable to the connector on the motherboard
labeled CPU_FAN1.
Do not forget to connect the CPU fan connector! Hardware monitoring
errors can occur if you fail to plug this connector.
2. Push down two fasteners at
a time in a diagonal
sequence to secure the
heatsink and fan assembly in
place.
B
B
AA
A
AB
B
P5GD1-FM
®
CPU_FAN1
GND
CPU FAN PWR
CPU FAN IN
CPU FAN PWM
P5GD1-FM CPU_FAN connector

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1-10 Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introductionChapter 1: Product introduction
Chapter 1: Product introduction
1.3.31.3.3
1.3.31.3.3
1.3.3 Uninstalling the CPU heatsink and fanUninstalling the CPU heatsink and fan
Uninstalling the CPU heatsink and fanUninstalling the CPU heatsink and fan
Uninstalling the CPU heatsink and fan
To uninstall the CPU heatsink and fan:
1. Disconnect the CPU fan
cable from the connector on
the motherboard.
2. Rotate each fastener
counterclockwise.
3. Pull up two fasteners at a
time in a diagonal sequence
to disengage the heatsink
and fan assembly from the
motherboard.
B
B
AA
A
AB
B
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