ASUS P4B266-M User Manual

P4B266-M

User Guide

Motherboard

Checklist

E885 First Edition November 2001

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.

Contents

FCC/CDC statements .....................................................................vi

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

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

How this guide is organized.................................................. viii

Conventions used in this guide............................................... ix

Where to find more information .............................................. ix

ASUS contact information ................................................................x

Chapter 1: Product introduction ........................................... 1-1

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

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

1.3 Overview............................................................................. 1-2

1.3.1 Identifying the motherboard components ................ 1-2

1.3.2 Pre-installed accessory........................................... 1-5

1.4 Special features .................................................................. 1-6

Chapter 2: Hardware information ......................................... 2-1

2.1 Motherboard installation ...................................................... 2-1

2.1.1 Placement direction ................................................ 2-1

2.1.2 Screw holes............................................................ 2-1

Features

2.2 Motherboard layout ............................................................. 2-2

2.3 Before you proceed............................................................. 2-3

2.4 Central Processing Unit (CPU) ............................................ 2-4

2.4.1 Overview ................................................................ 2-4

2.4.2 Installing the CPU ................................................... 2-5

2.4.3 Installing the heatsink and fan................................. 2-7

2.4.4 Connecting the CPU fan cable................................ 2-9

2.5 System memory ................................................................ 2-10

2.5.1 Overview .............................................................. 2-10

2.5.2 Memory configurations ......................................... 2-10

2.5.3 Installing a DIMM ...................................................2-11

2.5.4 Removing a DIMM................................................ 2-12

2.6 Expansion slots ................................................................. 2-13

2.6.1 Installing an expansion card.................................. 2-13

2.6.2 Configuring an expansion card ............................. 2-14

2.6.3 PCI slots ............................................................... 2-15

iii

Safeguards

Contents

2.6.4 AGP slot ............................................................... 2-15

2.6.5 CNR slot............................................................... 2-16

2.7 Switches and jumpers ....................................................... 2-17

2.7.1 Switch settings...................................................... 2-17

2.8 Connectors ....................................................................... 2-19

Chapter 3: Powering up ........................................................ 3-1

3.1 Starting up for the first time.................................................. 3-1

3.3 Powering off the computer................................................... 3-2

Chapter 4: BIOS setup .......................................................... 4-1

4.1 Managing and updating your BIOS...................................... 4-1

4.1.1 Using the computer system for the first time ........... 4-1

4.1.2 Updating BIOS procedures ..................................... 4-3

4.2 BIOS Setup program........................................................... 4-5

4.2.1 BIOS menu bar....................................................... 4-6

4.2.2 Legend bar ............................................................. 4-6

4.3 Main Menu .......................................................................... 4-8

4.3.1 Primary and Secondary Master/Slave ..................... 4-9

4.3.2 Keyboard Features ............................................... 4-13

4.4 Advanced Menu ................................................................ 4-15

4.4.1 Chip Configuration ................................................ 4-17

4.4.2 I/O Device Configuration....................................... 4-19

4.4.3 PCI Configuration ................................................. 4-21

4.5 Power Menu...................................................................... 4-24

4.5.1 Power Up Control ................................................. 4-26

4.5.2 Hardware Monitor ................................................. 4-28

4.6 Boot Menu ........................................................................ 4-29

4.7 Exit Menu.......................................................................... 4-31

Chapter 5: Software support ................................................ 5-1

5.1 Install an operating system.................................................. 5-1

5.1.1 Windows 98 first time installation ............................ 5-1

5.2 Support CD information....................................................... 5-1

5.2.1 Running the support CD ......................................... 5-1

5.2.2 Main menu ............................................................. 5-2

5.2.3 Software menu ....................................................... 5-3

Contents

5.2.4 Drivers menu .......................................................... 5-5

5.2.5 DOS Utilities menu ................................................. 5-6

5.2.6 ASUS Contact Information...................................... 5-6

5.2.7 Other information .................................................... 5-7

5.3 Software information ........................................................... 5-9

5.3.1 ASUS Update ......................................................... 5-9

Glossary ................................................................................ G-1

Index ........................................................................................ I-1

FCC/CDC statements

Federal Communications Commission Statement

This device complies with FCC Rules Part 15. 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 modifications 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.

Safety information

Electrical safety

• To prevent electrical shock hazard, disconnect the power cable from the electrical outlet before relocating the system.

• When adding or removing devices to or from the system, ensure that the power cables for the devices are unplugged before the signal cables are connected. If possible, disconnect all power cables from the existing system before you add a device.

• Before connecting or removing signal cables from the motherboard, ensure that all power cables are unplugged.

• Seek professional assistance before using an adpater 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 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.

vii

About this guide

This user guide contains the information you need when installing the ASUS P4B266-M motherboard.

How this guide is organized

This manual contains the following parts:

• Chapter 1: Product introduction

This chapter describes the features of the P4B266-M motherboard. It includes brief descriptions of the special attributes of the motherboard and the new technology it supports.

• Chapter 2: Hardware information

This chapter lists the hardware setup procedures that you have to perform when installing system components. It includes description of the switches, jumpers, and connectors on the motherboard.

• Chapter 3: Powering up

This chapter describes the power up sequence and gives information on the BIOS beep codes.

• Chapter 4: BIOS setup

This chapter tells how to change system settings through the BIOS Setup menus. Detailed descriptions of the BIOS parameters are also provided.

• Chapter 5: Software support

This chapter describes the contents of the support CD that comes with the motherboard package.

• Glossary

This part lists the technical terms that you may encounter when reading this document.

• Index

This part contains an alphabetical list of the topics found in this document.

viii

Conventions used in this guide

To make sure that you perform certain tasks properly, take note of the following symbols used throughout this manual.

WARNING: Information to prevent injury to yourself when trying to complete a task.

CAUTION: Information to prevent damage to the components when trying to complete a task.

IMPORTANT: Information that you MUST follow to complete a task.

NOTE: Tips and additional information to aid in completing a task.

Where to find more information

Refer to the following sources for additional information and for product and software updates.

1. ASUS Websites The ASUS websites worldwide provide updated information on ASUS

hardware and software products. The ASUS websites are listed in the ASUS Contact Information on page x.

2. Optional Documentation

Your product package may include optional documentation, such as warranty flyers, that may have been added by your dealer. These documents are not part of the standard package.

ASUS contact information

ASUSTeK COMPUTER INC. (Asia-Pacific)

Address: 150 Li-Te Road, Peitou, Taipei, Taiwan 112 General Tel: +886-2-2894-3447 General Fax: +886-2-2894-3449 General Email: info@asus.com.tw

Technical Support

MB/Others (Tel): +886-2-2890-7121 (English) Notebook (Tel): +886-2-2890-7122 (English) Desktop/Server (Tel): +886-2-2890-7123 (English) Support Fax: +886-2-2890-7698 Support Email: tsd@asus.com.tw Web Site: www.asus.com.tw Newsgroup: cscnews.asus.com.tw

ASUS COMPUTER INTERNATIONAL (America)

Address: 6737 Mowry Avenue, Mowry Business Center,

Building 2, Newark, CA 94560, USA General Fax: +1-510-608-4555 General Email: tmd1@asus.com

Technical Support

Support Fax: +1-510-608-4555 Notebook (Tel): 1-877-918-ASUS (2787) Web Site: www.asus.com Support Email: tsd@asus.com

ASUS COMPUTER GmbH (Europe)

Address: Harkortstr. 25, 40880 Ratingen, BRD, Germany General Fax: +49-2102-442066 General Email: sales@asuscom.de (for marketing requests only)

Technical Support

Support Hotline: MB/Others: +49-2102-9599-0 Notebook (Tel): +49-2102-9599-10 Support Fax: +49-2102-9599-11 Support (Email): www.asuscom.de/de/support (for online support) Web Site: www.asuscom.de

Chapter 1

This chapter describes the features of the P4B266-M motherboard. It includes brief explanations of the special attributes of the motherboard and the new technology it supports.

Product introduction

ASUS P4B266-M motherboard

1.1 Welcome!

Thank you for buying the ASUS® P4B266-M motherboard!

The ASUS

P4B266-M motherboard delivers a host of new features and latest technology making it another standout in the long line of ASUS quality motherboards!

The P4B266-M incorporates the Intel package/Northwood Processor coupled with the Intel

Pentium® 4 Processor in 478-pin

845D (Brookdale)

chipset to set a new benchmark for an effective desktop platform solution. Supporting up to 2GB of system memory with PC2100/1600 ECC/non-

ECC DDR SDRAM, high-resolution graphics via an AGP 4X slot, communication and networking options through a CNR slot, high-speed data transfers using the ATA100 protocol, and AC ‘97-compliant audio features, the P4B266-M is your perfect vehicle to get ahead in the world of power computing!

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 P4B266-M package for the following items.

ASUS P4B266-M motherboard (micro-ATX form factor: 9.6-in x 9.6-in) ASUS P4B266-M support CD ASUS 2-port USB module 80-conductor ribbon cable for UltraDMA 100/66 IDE drives Ribbon cable for a 3.5-inch floppy drive I/O shield (for LAN models only) Bag of extra jumper caps User Guide

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

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1-1

1.3 Special features

Latest processor technology

The P4B266-M motherboard supports the latest Intel Pentium 4 478/ Northwood Processor, also known as P4, via a 478-pin surface mount ZIF socket. The Pentium 4 processor utilizes the advanced 0.18 micron processor core in FC-PGA2 package for a 2.0GHz frequency, while the Northwood processor uses the 0.13 micron processor core with 512KB L2 cache for up to a speedy 2.4GHz frequency. The P4 offers optimized performance for audio, video, and Internet applications.

DDR memory support

Employing the Double Data Rate (DDR) memory technology, the P4B266-M motherboard supports up to 2GB of system memory using PC2100/1600 DDR DIMMs. The ultra-fast 266MHz memory bus doubles the speed of the PC133 SDRAM to deliver the required bandwidth for the latest 3D graphics, multimedia, and Internet applications. See page 2-10.

Onboard LAN

The motherboard incorporates the RealTek 8100 PCI LAN chip to support 10BASE-T/100BASE-TX Fast Ethernet networking.

AGP warning LED

A red warning LED is onboard to serve as a smart burn-out protection. This LED lights up if you plug in any 3.3V AGP card into the AGP slot. When this LED is lighted, there is no way you can turn on the system power even if you press the power button.

1-2

Chapter 1: Product introduction

1.4 Over view

Before you install the P4B266-M motherboard, take some time to familiarize yourself with its physical configuration and available features. This will facilitate the motherboard installation and future upgrades. A sufficient knowledge of the motherboard specifications will also help you avoid mistakes that may damage the board and its components.

This section presents the motherboard components and points out their specific locations. A brief description of each component follows. Refer to Chapter 2 for detailed information on these components.

1.4.1 Identifying the motherboard components

177

Proceed to the succeeding pages for a brief description of each component.

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1-3

CPU socket. A 478-pin surface mount, Zero Insertion Force (ZIF)

socket called mPGA478 B. This socket accommodates the Intel

Pentium® 4 478/Northwood Processor with 400MHz system bus.

North bridge controller. This controller called the Intel Memory

Controller Hub (MCH) is one of the two major components of the Intel 845D (Brookdale) chipset. The MCH along with the south bridge Intel I/O Controller Hub 2 (ICH2) are interconnected through the Intel proprietary Hub interface. The MCH provides the processor interface, system memory interface, AGP interface, and Hub Interface.

DDR DIMM sockets. These two 184-pin DIMM sockets support up

to 2GB using ECC/ non-ECC PC2100/1600 DDR SDRAM DIMMs.

Super I/O chipset. This Low Pin Count (LPC) interface provides

the commonly used Super I/O functionality. The chipset supports a high-performance floppy disk controller for a 360K/720K/1.44M/

2.88M floppy disk drive, a multi-mode parallel port, two standard compatible UARTs, a Standard Infrared (SIR), one MPU-401 UART mode compatible MIDI/game port, and a Flash ROM interface.

ATX power connector. This 20-pin connector connects to an ATX

12V power supply. The power supply must have at least 1A on the +5V standby lead (+5VSB).

IDE connectors. These dual-channel bus master IDE connectors

support up to four Ultra DMA/100/66, PIO Modes 3 & 4 IDE devices. Both the primary (blue) and secondary (black) connectors are slotted to prevent incorrect insertion of the IDE ribbon cable.

Floppy disk connector. This connector accommodates the

provided ribbon cable for the floppy disk drive. One side of the connector is slotted to prevent incorrect insertion of the floppy disk cable.

Flash EEPROM. This 2Mb firmware contains the programmable

BIOS program.

DIP switches. This 5-switch Dual Inline Package (DIP) allows you

to set the CPU external frequency.

1-4

Chapter 1: Product introduction

South bridge controller. Referred to as the Intel I/O Controller

Hub 2 (ICH2) of the Intel 845D chipset, this controller provides the I/O subsystem that allows access to the rest of the system. The ICH2 integrates I/O functions such as system bus interface, Ultra ATA/100, Low Pin Count (LPC) interface, Universal Serial Bus (USB) 1.1 interface, PCI interface, and CNR interface.

ASUS ASIC. This chip performs multiple system functions that

include hardware and system voltage monitoring, power management routing, among others.

AGP warning LED. Serving as a smart burn-out protection for the motherboard, this red LED lights up if you plug in any 3.3V AGP card into the AGP slot. When this LED is lit, there is no way you can turn on the system power even if you press the power button.

Onboard LED. This onboard LED lights up if there is a standby power on the motherboard. This LED acts as a reminder to turn off the system power before plugging or unplugging devices.

CNR slot. This slot is specifically designed for the Communications and Networking Riser (CNR) card. The CNR supports V.90 analog modem, HPNA, USB Hub, and the 10BASE-T/100BASE-T Ethernet networking.

Audio CODEC. This AC ‘97 audio codec provides stereo analog I/O on the motherboard and peripheral devices to deliver high quality audio to PC-connected speakers, headphones, and microphones. The codec includes analog-to-digital and digital-toanalog sample rate converters, as power amplifiers and programmable gain blocks.

(on audio models only)

PCI slots. These three 32-bit PCI 2.2 expansion slots support bus

master PCI cards like SCSI or LAN cards with 133MB/s maximum throughput.

LAN controller. This RealTek 8100 PCI LAN controller fully supports 100BASE-TX Ethernet networking.

AGP slot. This Accelerated Graphics Port (AGP) slot supports 1.5V AGP4X mode graphics cards for 3D graphical applications.

Microphone jack. This Mic (pink) jack connects a microphone.

(on audio models only)

ASUS P4B266-M motherboard user guide

(on LAN models only)

1-5

Line In jack. This Line In (light blue) jack connects a tape player or

other audio sources.

(on audio models only)

Line Out jack. This Line Out (lime) jack connects a headphone or

a speaker. Game/MIDI connector. This connector supports a joystick or a

game pad for playing games, and MIDI devices for playing or editing audio files.

ATX 12V connector. This power connector connects the 4-pin +12V plug from the ATX 12V power supply.

Serial ports. These two 9-pin COM1/COM2 ports are for pointing devices or other serial devices.

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

USB ports. These two 4-pin Universal Serial Bus (USB) ports are available for connecting USB devices such as a mouse and PDA.

RJ-45 port. This port allows connection to a Local Area Network (LAN) through a network hub.

(on audio models only)

(on LAN models only)

PS/2 keyboard port. This purple 6-pin connector is for a PS/2

keyboard.

PS/2 mouse port. This green 6-pin connector is for a PS/2 mouse.

1-6

Chapter 1: Product introduction

Chapter 2

This chapter describes the hardware setup procedures that you have to perform when installing system components. It includes details on the switches, jumpers, and connectors on the motherboard.

Hardware information

ASUS P4B266-M motherboard

2.1 Motherboard installation

Before you install the motherboard, study the configuration of your chassis to ensure that the motherboard fits into it. The P4B266-M uses the microATX form factor that measures 9.6 inches x 9.6 inches, a standard fit for most chassis.

Make sure to unplug the power cord before installing or removing the motherboard. Failure to do so may cause you physical injury and damage motherboard components.

2.1.1 Placement direction

When installing 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. Refer to the image below.

2.1.2 Screw holes

Place eight (8) screws into the holes indicated by circles to secure the motherboard to the chassis.

Do not overtighten the screws! Doing so may damage the motherboard.

Place this side towards the rear of the chassis

ASUS P4B266-M motherboard user guide

2-1

2.2 Motherboard layout

24.4cm (9.60in)

PS/2KBMS

T: Mouse B: Keyboard

Bottom:

Top:

USB1

RJ-45

USB2

COM1

COM2

Line Out

Line

Mic

GAME_AUDIO

CD_IN

Audio Codec

PARALLEL PORT

MIC_IN

HP_OUT

Realtek

RTL8100

MODEM

ATX12V

AUX

CNR_SLOT

Socket 478

Intel 845

Memory

Controller

Hub (MCH)

Accelerated Graphics Port (AGP)

PCI1

P4B266-M

PCI2

LED1

PCI3

AUD_EN1

CMOS Power

WARNING

CPU_FAN

CR2032 3V

Lithium Cell

Controller

ASUS

Mozart

CLRTC(R200A)

Super

I/O

SYS_FAN

ATX Power Connector

DDR DIMM2 (64/72 bit, 184-pin module)

DDR DIMM1 (64/72 bit, 184-pin module)

2 3

0 1

Intel I/O

Hub

(ICH2)

USB1102

FLOPPY

SECONDARY IDE

HDDLED

2Mbit

Firmware

Hub

PANEL

PRIMARY IDE

24.4cm (9.6in)

SW1801

2-2

The audio and LAN features are optional and are grayed out in the above motherboard layout.

Chapter 2: Hardware information

2.3 Before you proceed

Take note of the following precautions before you install motherboard components or change any motherboard settings.

1. Unplug the power cord from the wall socket before touching any component.

2. Use a grounded wrist strap or touch a safely grounded object or to a metal object, such as the power supply case, before handling components to avoid damaging them due to static electricity.

3. Hold components by the edges and do not to touch the ICs on them.

4. Whenever you uninstall any component, place it on a grounded antistatic pad or in the bag that came with the component.

5. Before you install or remove any component, ensure that the

ATX power supply is switched off or the power cord is detached from the power supply. Failure to do so may cause

severe damage to the motherboard, peripherals, and/or components.

When lit, the green LED (LED1) indicates that the system is ON, in sleep mode, or in soft-off mode, a reminder that you should shut down the system before removing or plugging in any motherboard component.

The red LED (WARNING) is a smart protection from motherboard burn out caused by an incorrect AGP card. If you plug in any 3.3V AGP card into the 1.5V AGP slot, this LED lights up thus preventing the system to power up. This LED remains off if you plug in a 1.5V AGP card.

P4B266-M

P4B266-M Onboard LED

LED1

ON OFF

Standby

Power

WARNING

Incorrect

AGP Card

Powered

Off

OFF

Correct

AGP Card

ASUS P4B266-M motherboard user guide

2-3

2.4 Central Processing Unit (CPU)

2.4.1 Overview

The motherboard comes with a surface mount 478-pin Zero Insertion Force (ZIF) socket. This socket is specifically designed for the Intel Pentium® 4 478/Northwood Processor.

The Intel Pentium 4 Processor in the 478-pin package uses the Flip-Chip Pin Grid Array 2 (FC-PGA2) package technology, and includes the Intel NetBurst™ micro-architecture. The Intel NetBurst micro-architecture features the hyper-pipelined technology, rapid execution engine, 400MHz system bus, and execution trace cache. Together, these attributes improve system performance by allowing higher processor frequencies, faster execution of integer instructions, and a data transfer rate of 3.2GB/s.

Gold Mark

Note in the illustration that the CPU has a gold triangular mark on one corner. This mark indicates the processor Pin 1 that should match a specific corner of the CPU socket.

Incorrect installation of the CPU into the socket may bend the pins and severely damage the CPU!

2-4

Chapter 2: Hardware information

2.4.2 Installing the CPU

Follow these steps to install a CPU.

1. Locate the 478-pin ZIF socket on the motherboard.

2. Unlock the socket by pressing the lever sideways, then lift it up to a 90°-100° angle.

Socket Lever

90 -100

Make sure that the socket lever is lifted up to 90°-100° angle, otherwise the CPU does not fit in completely.

ASUS P4B266-M motherboard user guide

2-5

3. Position the CPU above the socket such that its marked corner matches the base of the socket lever.

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

The CPU fits only in one correct orientation. DO NOT force the CPU into the socket to prevent bending the pins and damaging the CPU!

Gold Mark

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

2-6

Chapter 2: Hardware information

2.4.3 Installing the heatsink and fan

The Intel® Pentium® 4 478/Northwood Processor requires a specially designed heatsink and fan assembly to ensure optimum thermal condition and performance.

When you buy a boxed Intel Pentium 4 478/Northwood Processor, the package includes the heatsink, fan, and retention mechanism.

In case you buy a CPU separately, make sure that you use only Intel certified heatsink and fan.

Follow these steps to install the CPU heatsink and fan.

1. Place the heatsink on top of the installed CPU, making sure that the heatsink fits 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.

CPU Heatsink

Retention Module Base

Your boxed Intel Pentium 4 478/Northwood 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.

ASUS P4B266-M motherboard user guide

2-7

2. Position the fan with the retention mechanism on top of the heatsink. Align and snap the four hooks of the retention mechanism to the holes on each corner of the module base.

Make sure that the fan and retention mechanism assembly perfectly fits the heatsink and module base, otherwise you cannot snap the hooks into the holes.

Retention Hole

Retention Lock

2-8

Retention Hook Snapped to the Retention Hole

Keep the retention locks lifted upward while fitting the retention mechanism to the module base.

Chapter 2: Hardware information

3. Push down the locks on the retention mechanism to secure the heatsink and fan to the module base.

When secure, the retention locks should point to opposite directions.

2.4.4 Connecting the CPU fan cable

When the fan, heatsink, and the retention mechanism are in place, connect the CPU fan cable to the connector on the motherboard labeled CPU_FAN.

CPU Fan Connector (CPU_FAN)

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+ 67 hidden pages