Aopen AX4SPEL User Manual
AAXX44SSPP // AAXX44SSPP--NN // AAXX44SSPPEE--NN // AAXX44SSPPEE--LL OOnnlliinnee MMaannuuaall
AX4SP/AX4SP-N/AX4SPE-N/AX4SPE-L
DOC. NO.: AX4SPEL-OL-E0304A
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WWhhaatt’’ss iinn tthhiiss mmaannuuaall
AX4SP/AX4SP-N/AX4SPE-N/AX4SPE-L...............................................................................................1
What’s in this manual ...................................................................................................................................................... 2
You Must Notice .............................................................................................................................................................. 8
Before You Start..............................................................................................................................................................9
Overview ....................................................................................................................................................................... 10
AX4SP / AX4SP-N / AX4SPE-N / AX4SPE-L Comparison Table.................................................................................... 11
Feature Highlight........................................................................................................................................................... 12
Quick Installation Procedure .........................................................................................................................................16
Motherboard Map .......................................................................................................................................................... 17
Block Diagram ............................................................................................................................................................... 18
Hardware Installation................................................................................................................19
About “Manufacturer Upgrade Optional” and “User Upgrade Optional”… ...................................................................... 20
EzColor ......................................................................................................................................................................... 21
JP14 Clear CMOS Data ................................................................................................................................................ 23
CPU Installation ............................................................................................................................................................ 24
CPU Over-current Protection......................................................................................................................................... 28
AOpen “Watch Dog ABS” ..............................................................................................................................................30
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CPU Core Voltage Auto Detectable ............................................................................................................................... 31
CPU and System Fan Connector (with H/W Monitoring) ............................................................................................... 33
JP28 Keyboard/Mouse Wake-up Enable/Disable Jumper .............................................................................................. 34
DIMM Sockets ............................................................................................................................................................... 35
Front Panel Connector .................................................................................................................................................. 38
ATX Power Connector...................................................................................................................................................39
AC Power Auto Recovery .............................................................................................................................................. 40
STBY LED ..................................................................................................................................................................... 41
IDE and Floppy Connector ............................................................................................................................................ 42
Serial ATA Supported (with RAID function, RAID 0 for AX4SPE-L only) ........................................................................ 44
IrDA Connector .............................................................................................................................................................52
S/PDIF (Sony/Philips Digital Interface) Connector......................................................................................................... 53
Super 5.1 Channel Audio Effect .................................................................................................................................... 54
AGP (Accelerated Graphic Port) 8X Expansion Slot......................................................................................................55
AGP Protection Technology and AGP LED....................................................................................................................56
Color Coded Back Panel ...............................................................................................................................................57
Support Gigabit or 10/100 Mbps LAN onboard (for AX4SP-N, AX4SPE-N and AX4SPE-L) ........................................... 58
Support Eight USB 2.0 Connectors ............................................................................................................................... 59
Game Port Bracket Supported ...................................................................................................................................... 60
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Chassis Intrusion Connector .........................................................................................................................................61
CD Audio Connector ..................................................................................................................................................... 62
AUX-IN Connector.........................................................................................................................................................63
Front Audio Connector .................................................................................................................................................. 64
AOConfig Utility ............................................................................................................................................................. 65
Resetable Fuse ............................................................................................................................................................. 67
3300µF Low ESR Capacitor .......................................................................................................................................... 68
Enlarged Aluminum Heatsink ........................................................................................................................................ 70
Vivid BIOS technology...................................................................................................................................................71
The noise is gone!! ---- SilentTek ..................................................................................................................................72
EzClock......................................................................................................................................................................... 75
Hyper Threading Technology......................................................................................................................................... 79
Driver and Utility .......................................................................................................................81
Auto-run Menu from Bonus CD Disc ............................................................................................................................. 81
Installing Intel® Chipset Software Installation Utility....................................................................................................... 82
Installing Onboard Sound Driver ...................................................................................................................................83
Installing Intel IAA Driver RAID Edition in Windows XP (For AX4SPE-L only)............................................................. 84
Installing Gigabit LAN Driver in Windows 2000/XP (for AX4SPE-L)............................................................................... 85
Installing BroadCom BCM4401 10/100 LAN Driver in Windows 2000/XP (for AX4SP-N and AX4SPE-N) ................... 96
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Installing USB 2.0 Driver in Windows 98SE/ME .......................................................................................................... 108
PHOENIX-AWARD BIOS............................................................................................................ 114
How To Use Phoenix-Award™ BIOS Setup Program................................................................................................... 115
How To Enter BIOS Setup ........................................................................................................................................... 116
BIOS Upgrade under Windows environment ............................................................................................................... 117
WinBIOS Utility ........................................................................................................................................................... 119
Glossary ..................................................................................................................................121
AC97 CODEC ............................................................................................................................................................. 121
ACPI (Advanced Configuration & Power Interface) ..................................................................................................... 121
ACR (Advanced Communication Riser)....................................................................................................................... 121
AGP (Accelerated Graphic Port).................................................................................................................................. 122
AMR (Audio/Modem Riser).......................................................................................................................................... 122
ATA (AT Attachment) ...................................................................................................................................................122
BIOS (Basic Input/Output System) .............................................................................................................................. 123
Bluetooth..................................................................................................................................................................... 123
CNR (Communication and Networking Riser).............................................................................................................. 123
DDR (Double Data Rate) RAM .................................................................................................................................... 124
ECC (Error Checking and Correction) ......................................................................................................................... 124
EEPROM (Electronic Erasable Programmable ROM).................................................................................................. 124
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EPROM (Erasable Programmable ROM)..................................................................................................................... 124
EV6 Bus ...................................................................................................................................................................... 125
FCC DoC (Declaration of Conformity) .........................................................................................................................125
FC-PGA (Flip Chip-Pin Grid Array) .............................................................................................................................. 125
FC-PGA2 (Flip Chip-Pin Grid Array) ............................................................................................................................ 125
Flash ROM .................................................................................................................................................................. 125
Hyper Threading ......................................................................................................................................................... 126
IEEE 1394...................................................................................................................................................................126
Parity Bit ..................................................................................................................................................................... 126
PCI (Peripheral Component Interface) Bus .................................................................................................................127
PDF Format................................................................................................................................................................. 127
PnP (Plug and Play) .................................................................................................................................................... 127
POST (Power-On Self Test) ........................................................................................................................................127
PSB (Processor System Bus) Clock ............................................................................................................................ 127
RDRAM (Rambus Dynamic Random Access Memory)................................................................................................ 128
RIMM (Rambus Inline Memory Module) ......................................................................................................................128
SDRAM (Synchronous DRAM) .................................................................................................................................... 128
SATA (Serial ATA) .......................................................................................................................................................128
SMBus (System Management Bus) ............................................................................................................................. 129
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SPD (Serial Presence Detect) ..................................................................................................................................... 129
USB 2.0 (Universal Serial Bus) ...................................................................................................................................129
VCM (Virtual Channel Memory)................................................................................................................................... 129
Wireless LAN – 802.11b .............................................................................................................................................. 130
ZIP file......................................................................................................................................................................... 130
Troubleshooting....................................................................................................................... 131
Technical Support ...................................................................................................................135
Product Registration ...............................................................................................................138
How to Contact Us .................................................................................................................. 139
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YYoouu MMuusstt NNoottiiccee
Adobe, the Adobe logo, Acrobat is trademarks of Adobe Systems Incorporated.
AMD, the AMD logo, Athlon and Duron are trademarks of Advanced Micro Devices, Inc.
Intel, the Intel logo, Intel Celeron, Pentium II, Pentium III, Pentium 4 are trademarks of Intel Corporation.
Microsoft, Windows, and Windows logo are either registered trademarks or trademarks of Microsoft Corporation in the United
States and/or other countries.
All product and brand names used on this manual are used for identification purposes only and may be the registered
trademarks of their respective owners.
All of the specifications and information contained in this manual are subject to change without notice. AOpen reserves the right
to revise this publication and to make reasonable changes. AOpen assumes no responsibility for any errors or inaccuracies that
may appear in this manual, including the products and software described in it.
This documentation is protected by copyright law. All rights are reserved.
No part of this document may be used or reproduced in any form or by any means, or stored in a database or retrieval
system without prior written permission from AOpen Corporation.
Copyright
©
1996-2003, AOpen Inc. All Rights Reserved.
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BBeeffoorree YYoouu SSttaarrtt
This Online Manual will introduce to the user how this product is installed. All useful information will be described in later
chapters. Please keep this manual carefully for future upgrades or system configuration changes. This Online Manual is saved
in PDF format
get free download from Adobe web site
Although this Online Manual is optimized for screen viewing, it is still capable for hardcopy printing, you can print it by A4 paper
size and set 2 pages per A4 sheet on your printer. To do so, choose File > Page Setup and follow the instruction of your printer
driver.
Thanks for the help of saving our earth.
, we recommend using Adobe Acrobat Reader 5.0 for online viewing, it is included in Bonus CD disc or you can
.
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OOvveerrvviieeww
Thank you for choosing AOpen AX4SP / AX4SP-N / AX4SPE-N / AX4SPE-L motherboard. The AX4SP / AX4SP-N / AX4SPE-N /
AX4SPE-L is Intel
AX4SP and AX4SP-N) or Intel
M/B, the AX4SP / AX4SP-N / AX4SPE-N / AX4SPE-L motherboard can support Intel
MHz Front Side Bus (FSB)
performance, it has one AGP slot and supports AGP 8X/4X mode and pipelined spilt-transaction long burst transfer up to
AGP
2112MB/sec. According to different customer’s requirements, the Intel Springdale-P/PE chipset memory interface supports
400/333/266 (Intel Springdale-P chipset only support DDR333/266) RAM devices with densities of 128, 256, 512Mb DDR
DDR
RAM modules and the maximum memory size can be up to 4 GB. The onboard IDE controller supports Ultra DMA
mode, Serial ATA
this board. For AX4SPE-L, it also supports RAID 0 function under
Windows XP when use Serial ATA hard disks. On the strength of
Broadcom Gigabit BCM5705 controller (for AX4SPE-L) or
Broadcom BCM4401 LAN controller (for AX4SP-N and AX4SPE-N)
on board, it provides 10/100M bps Ethernet for office and home
use. Besides, the AX4SP / AX4SP-N / AX4SPE-N / AX4SPE-L has
an AC97 CODEC
magic surround stereo sound to let people enjoy working with it.
More than that, this motherboard supports USB 2.0
fancy speed of up to 480Mbps. Now, let’s enjoy all features from
AOpen AX4SP / AX4SP-N / AX4SPE-N / AX4SPE-L motherboard.
®
Socket 478 motherboard (M/B) based on the ATX form factor featuring the Intel® Springdale-P chipset(for
150 Mbps and there are 6 PCI slots provided on
chipset onboard, providing high performance and
®
Springdale-PE chipset(for AX4SPE-N and AX4SPE-L) . As high performance chipset built in the
clock(for AX4SP and AX4SP-N, they support 533/400 FSB clock and 800MHz Overclocking). In the
function with a
®
Socket 478 Pentium® 4 and 400/533/800
33/66/100
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AAXX44SSPP // AAXX44SSPP--NN // AAXX44SSPPEE--NN // AAXX44SSPPEE--LL CCoommppaarriissoonn TTaabbllee
Following we list functions of all models. “V” represents those functions that the model equips with and “X” represents
functions that models don’t have. Please always refer to this page to see the functions of your model.
Item AX4SP AX4SP-N AX4SPE-N AX4SPE-L
Chipset (NB, SB)
FSB
Memory
LAN
RAID 0
Intel Springdale-P,
Intel ICH5
533/400 MHz 533/400 MHz 800/533/400 MHz 800/533/400 MHz
DDR 333/266 DDR 333/266 DDR 400/333/266 DDR 400/333/266
X
X X X V
Intel Springdale-P,
Intel ICH5
Broadcom BCM4401
10/100Mbps
Intel Springdale-PE,
Intel ICH5
Broadcom BCM4401
10/100Mbps
Intel Springdale-PE,
Gigabit BCM5705
10/100/1000Mbps
Intel ICH5R
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FFeeaattuurree HHiigghhlliigghhtt
CPU
Supports Intel® Socket 478 Pentium® 4 1.6GHz~3.06 GHz+ designed for Socket 478 technology. AX4SPE-N and AX4SPE-L
support 400/533/800 MHz FSB; AX4SP and AX4SP-N only support 400/533 MHz FSB.
Chipset
Springdale-P/PE is a Memory Controller Hub (MCH) designed for use with the Pentium 4 processor with 512-KB L2 cache on
0.13 micron processor. The MCH provides CPU, DDR, AGP, Hub, and CSA Interfaces. The CPU interface supports Pentium 4
processor subset of the Extended Mode of the Scalable Bus Protocol. The MCH memory interface supports one up to two
channels of DDR, and the AGP interface supports 0.8V/1.5V signaling with 8X/4X data transfers and 8X/4X AGP Fast Writes.
The Springdale-P/PE platform supports the fifth generation I/O Controller Hub (ICH5 and ICH5R).
The ICH5 integrates an Ultra ATA 100 controller, two Serial ATA host controllers, one EHCI host controller and four UHCI host
controllers supporting eight external USB 2.0 ports, LPC interface controller; flash BIOS interface controller, PCI interface
controller, AC’97 digital controller, an ASF controller and a hub interface for communication with the Springdale-P/PE MCH. The
ICH5R offers the same feature as ICH5 and adds support for
RAID
0 functions.
Expansion Slots
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Including six 32-bit/33MHz PCI and one AGP 8X/4X slots. The PCI local bus throughput can be up to 132MB/s. Of six PCI slots
provided, five of them are master PCI slots with arbitration and decoding for all integrated functions and LPC bus, and PCI 6
supports slave mode PCI card only. AX4SP / AX4SP-N / AX4SPE-N / AX4SPE-L motherboard includes one AGP expansion slot
for a bus mastering AGP graphic card. The
sophistication and speed. The AGP video cards support data transfer rate up to 2112MB/s.
Accelerated Graphics Port (AGP)
specification provides a new level of video display
Memory
With Springdale-P/PE chipset, this motherboard can support dual channel Double-Data-Rate (DDR) RAM. The dual channel
mode allows chipsets to get data in 128 bit and zero wait state bursting between the RAM, The data transfers at
266/333/400MHz(AX4SP and AX4SP-N only support DDR266/333MHz). The four slots of DDR RAM can be composed of an
arbitrary mixture of 128, 256, 512 MB or 1GB DDR RAM and maximum up to 4GB.
LAN Port (AX4SP-N, AX4SPE-N and AX4SPE-L only)
For AX4SPE-L, on the strength of Broadcom BCM5705 on board, which is a highly-integrated Platform LAN Connect device, it
provides 10/100/1000 Mbps Ethernet for office and home use. For AX4SP-N and AX4SPE-N, there is a Broadcom BCM4401
controller on board, and it can provide 10/100 Mbps Ethernet.
Ultra DMA 33/66/100 Bus Mater IDE
Comes with an on-board PCI Bus Master IDE controller with two connectors that support four IDE devices in two channels,
supports Ultra DMA 33/66/100, PIO Modes 3 and 4 and Bus Master IDE DMA Mode 5, and supports Enhanced IDE devices.
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Serial ATA
Integrated in ICH5/ICH5R that contains independent DMA operation on two ports. The SATA controllers are completely software
transparent with the IDE interface, while providing a lower pin count and higher performance. The ICH5/ICH5R SATA interface
supports data transfer rates up to 150MB/s. For AX4SPE-L, it integrates ICH5R on board and supports RAID 0 function under
Windows XP when using SATA HDD.
On-board AC’97 Sound
AX4SP / AX4SP-N / AX4SPE-N / AX4SPE-L use the AC97 CODEC sound chip. This on-board audio includes a complete audio
recording and playback system.
1MHz Stepping Frequency Adjustment
Provides “1MHz Stepping Frequency Adjustment” function in the BIOS. This magic function allows you adjust FSB frequency
from 100~400 by 1MHz stepping adjustment, and lets your system can get maximum performance.
Watch Dog ABS
Includes AOpen “Watch Dog ABS” functions that can auto-reset default settings in 4.8 seconds when you fail to system
overclocking.
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S/PDIF Connectors
S/PDIF (Sony/Philips Digital Interface) is a newest audio transfer format, which provides impressive quality through optical fiber
and allows you to enjoy digital audio instead of analog audio.
Eight USB 2.0 Ports
Provides six ports on the back panel and one USB 2.0 connector on the board, providing a total of eight USB 2.0 interface to
connect devices such as mouse, keyboard, modem, scanner, etc.
Power Management/Plug and Play
Supports the power management function that confirms to the power-saving standards of the U.S. Environmental Protection
Agency (EPA) Energy Star program. It also offers
making the system much user-friendlier.
Plug-and-Play
, which helps save users from configuration problems, thus
Hardware Monitoring Management
Supports CPU or system fans status, temperature and voltage monitoring and alert, through the on-board hardware monitor
module.
Enhanced ACPI
Fully implement the ACPI standard for Windows® 98SE/ME/2000/XP series compatibility, and supports Soft-Off, STR (Suspend
to RAM, S3), STD (Suspend to Disk, S4) features.
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QQuuiicckk IInnssttaallllaattiioonn PPrroocceedduurree
This page gives you a quick procedure on how to install your system. Follow each step accordingly.
1. Installing CPU and Fan
2. Installing System Memory (DIMM)
3. Connecting Front Panel Cable
4. Connecting IDE and Floppy Cable
5. Connecting ATX Power Cable
6. Connecting Back Panel Cable
7. Power-on and Load BIOS Setup Default
8. Setting CPU Frequency
9.
Reboot
Installing Operating System (such as Windows XP)
10.
Installing Driver and Utility
11.
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4
XX4
Broadcom Gigabit LAN chip
Broadcom BCM4401 LAN chip
32-bit PCI Expansion Slot x6
(AX4SPE-L only)
(AX4SP-N and AX4SPE-N)
Game Port Connector
CD-IN Connector
Onboard AC’97 CODEC
AUX-IN Connector
Front Audio Connector
S/PDIF Connector
Case Open Connector
SYSFAN3 Connector
IrDA Connector
USB 2.0 Connector
JP14 CMOS Clear Jumper
2Mb Flash ROM BIOS
(AX4SPE-L with 3Mb Flash ROM)
(only AX4SPE-L support RAID 0)
STBY LED
AGP Protection LED
Serial ATA Port x2
Front Panel Connector
FDD Connector
Motherboard Map
Colored Back Panel
JP28 Keyboard/Mouse Wakeup
Enable/Disable Jumper
Resetable Fuse
SYSFAN2 Connector
3300μF Low ESR Capacitors
4-pin 12V. ATX Power Connector
8x AGP Slot
478-pin CPU socket with Voltage
and Frequency Auto-detection that
supports Intel
1.6~3.06GHz+ CPU
Intel® Springdale-P/PE chipset
CPUFAN1 Connector
184-pin DIMMx4 supports Dual
Channel mode DDR 400/333/266
Max. to 4GB
(only AX4SPE-N and AX4SPE-L
support DDR400)
ATX Power Connector
ATA 33/66/100
IDE Connector x2
®
Pentium4
Northwood)
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BBlloocckk DDiiaaggrraamm
Socket 478
Inte l
Pentium 4
CPU
AGP 8x/4x Slo t
800/533/400MHz
LAN connect C omponent
(for AX4SP-N ,A X4SPE-N
Floppy Disk Drive x2
DDR 400/333/266 Dual Channel
RAM up to 4G
DIMM Socket x4
System Bus
Intel Springdale- P
(AX4SP and AX4SP-N)
Intel Springdale-PE
(AX4SPE-N and AXSPE-L)
GMCH
and AX4SPE-L)
USB 2.0
Connector x8
PCI Bus
Two Serial ATA Ports 150M B/s
ATA
33/66100
Broadcom BCM5702
(AX4SPE-L)
Broadcom BCM4401
(AX4SP-N, AX4SPE -N)
1stUSB Port
2ndUSB Port
3rdUSB Port
4thUSB Port
32-bit PCI Slot x6
Primary
Channel
Secondary
Intel ICH5
(for AX4SP, AX4SP-N
and AX4SPE-N)
ICH5R(for AX4SP E-L)
Channel
Low
Pin
Count
Super
I/O
AC97
CODEC
Firmware Hub
2Mbit Flash EEPROM
(for AX4SP,AX4SP-N and
AX4SPE-N) 3Mbit Fl ash
EEPROM (for AX4SPE-L)
Parallel Port
Serial Port x2
SATA 1
SATA 2
IDE D rive x4
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HHaarrddwwaarree IInnssttaallllaattiioonn
This chapter describes jumpers, connectors and hardware devices of this motherboard.
Note: Electrostatic discharge (ESD) can damage your processor, disk drives, expansion boards, and other
components. Always observe the following precautions before you install a system component.
1. Do not remove a component from its protective packaging until you are ready to install it.
2. Wear a wrist ground strap and attach it to a metal part of the system unit before handling a component. If
a wrist strap is not available, maintain contact with the system unit throughout any procedure requiring
ESD protection.
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AAbboouutt ““MMaannuuffaaccttuurreerr UUppggrraaddee OOppttiioonnaall”” aanndd ““UUsseerr UUppggrraaddee OOppttiioonnaall””……
When you read this online manual and start to assemble your computer system, you may find some of functions are called “Manufacturer
Upgrade Optional”, and some are called “User Upgrade Optional”. Though all AOpen motherboards include many amazing and powerful
features, in some situations, these powerful features are not used to every user. Hence, we changed some key features as “Manufacturer
Upgrade Optional” for you to choose. Some optional functions that can be upgraded by users, we call them “User Upgrade Optional”. As for
those optional functions that can’t be upgraded by ourselves, we call them “Manufacturer Upgrade Optional”. If needed, you can contact our
local distributors or resellers for purchasing “User Upgrade Optional” components, and again you can visit AOpen official web site:
http://english.aopen.com.tw/
for more detail information.
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EEzzCCoolloorr
Breaking through traditional outlook of motherboard, AOpen now brings you a new fresh look of motherboard! – EzColor!
Fancy? You may think so, but actually it is a practical and useful feature for amateur or even power-users. Coming in specific color for
specific connector and module, components on motherboard are now born with their respective colors. Users may now easily recognize
what jumper or cable should match with specific jumper or cable by COLOR, without having the trouble of holding user guide in one hand
and connecting jumpers with the other hand.
And what makes this feature so great is that, even the easy-to-get-confused front panel connector is differentiated now with different light
colors!
Light Yellow: PCI Master
Dark Blue: Memory Module
Purple: Memory Module
Light Blue: AGP Slot
Brown: PCI Slave
Dark Red: Both
4-pin and 12-pin
ATX connector
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Red: Serial ATA connector
IDE LED
SPEAKER
Note: Colors setting varies on different motherboards, the color setting here applies only to AX4SP / AX4SP-N / AX4SPE-N / AX4SPE-L.
ACPI & Power LED
RESET
22
Blue: IDE 1 Connector
(
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JJPP1144 CClleeaarr CCMMOOSS DDaattaa
You can clear CMOS to restore system default setting. To clear the CMOS, follow the procedure below.
1. Turn off the system and unplug the AC power.
2. Remove ATX power cable from connector PWR2.
3. Locate JP14 and short pins 2-3 for a few seconds.
4. Return JP14 to its normal setting by shorting pins 1 & pin2.
5. Connect ATX power cable back to connector PWR2.
Pin 1
1
Normal
default
1
Clear CMOS
Tip: When should I Clear CMOS?
1. Boot fails because of overclocking…
2. Forget password…
3. Troubleshooting…
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CCPPUU IInnssttaallllaattiioonn
This motherboard supports Intel® Pentium 4 Socket 478 series CPU. Be careful of CPU orientation when you plug it into CPU socket.
1. Pull up the CPU socket lever and
up to 90-degree angle.
Note: These pictures are for example only; it may not exactly be the same motherboard.
3. Press down the CPU socket lever and finish CPU installation.
2. Locate Pin 1 in the socket and look for a cut edge on the CPU upper
interface. Match Pin 1 and cut edge, then insert the CPU into the socket.
CPU socket
Lever
CPU pin 1 and
cut edge
CPU cut edge
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Note: This picture is for example only; it may not exactly be the same motherboard.
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CPU cut edge
Note: This socket supports
Micro-FC-PGA2 package CPU, which is
the latest CPU package developed by
Intel. Other forms of CPU package are
impossible to be fitted in.
Note: If you do not match the CPU
socket Pin 1 and CPU cut edge well, it
ma
damage the CPU.
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This motherboard comes with a retention module attached on the CPU socket when shipped, we strongly recommend you to install AOpen
special designed CPU Fan as shown below on the retention module for better heat dissipation. Please install the CPU Fan correctly as the
following pictures shown.
1. Gently put the CPU Fan down on the
retention module with clips aligning correctly
to the four corners.
2. Pressing down the four clips with force one by one
on the retention module.
Clip
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CPU VID signal and SMbus clock generator provide CPU voltage auto-detection and allows the user to set the CPU frequency through the
BIOS setup, therefore no jumpers or switches are used. The disadvantages of the Pentium based jumper-less designs are eliminated.
There will be no worry of wrong CPU voltage detection.
CPU VID signal
(Automatically generates CPU voltage)
Intel® Socket 478
Power Regulator
Pentium 4
CPU voltage
Clock Generator
CPU Freq. Ratio
BIOS
Controlled
Circuit
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The Over Current Protection is a popular implementation on ATX 3.3V/5V/12V switching power supply. However, the new generation CPU
uses different voltage with a regulator to transfer 12V to CPU voltage (for example, 2.0V), and thus makes 5V over current protection
useless. This motherboard is with switching regulator onboard supporting CPU over-current protection; in conjunction with 3.3V/5V/12V
power supply provide the full line over-current protection.
ATX Switching Power Supply
Note: Although we have implemented protection circuit try to prevent any human operating mistake,
there is still certain risk that CPU, memory, HDD, add-on cards installed on this motherboard may be
damaged because of component failure, human operating error or unknown nature reason. AOpen
cannot guaranty the protection circuit will always work perfectly.
5V (Protected by power supply)
3.3V (Protected by power supply)
12V (Protected by power supply)
Onboard Power Regulator
(Over-Current Protection)
CPU Core Voltage
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This Motherboard implements a Flash ROM
Setup configurations. The RTC (real time clock) can also keep running as long as the power cord is plugged. If you lose your CMOS data
by accident, you can just reload the CMOS configurations from Flash ROM and the system will recover as usual.
and a special circuit that provide you no batter power consumption of current CPU and CMOS
ATX Stand-by Power
n
Battery
Flash ROM
(Real Time Clock)
Auto Switch
RTC
00:00:00
CMOS
Auto switch to ATX standby
power as long as AC power line
is plugged. This smart design
increases battery life if you still
plug battery on motherboard.
Backup by EEPROM
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CPU FSB frequency according to user’s settings stored in the BIOS. If system failed in BIOS POST, the “Watch Dog Timer” will
reset the system to reboot in five seconds. Then, BIOS will detect the CPU’s default frequency and POST again. With this
special feature, you can easily overclock your system to get a higher system performance without removing the system housing
and save the hassle from setting the jumper to clear CMOS data when system hangs.
AOpen
Watch Dog ABS
Enable/Disable Signal
AOpen provides a special and useful feature on this motherboard for overclockers.
When you power-on the system, the BIOS will check last system POST
succeeded, the BIOS will enable “Watch Dog ABS” function immediately, and set the
from BIOS
BIOS
Reset Signal
Clock Generator
Countdown about
5 seconds if fails
in POST
status. If it
CPU ID Signal
CPU
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