The information in this document is subject to change without notice and does not
represent a commitment on part of the vendor, who assumes no liability or
responsibility for any errors that may appear in this manual.
No warranty or representation, either expressed or implied, is made with respect to the
quality, accuracy or fitness for any particular part of this document. In no event shall
the manufacturer be liable for direct, indirect, special, incidental or consequential
damages arising from any defect or error in this manual or product.
Product names appearing in this manual are for identification purpose only and
trademarks and product names or brand names appearing in this document are the
property of their respective owners.
This document contains materials protected under International Copyright Laws. All
rights reserved. No part of this manual may be reproduced, transmitted or transcribed
without the expressed written permission of the manufacturer and authors of this
manual.
If you do not properly set the motherboard settings, causing the motherboard to
malfunction or fail, we cannot guarantee any responsibility.
Specifications and information contained herein are subject to change without notice.
AX8 Series
Introduction 1-3
1-2. Layout Diagram
User’s Manual
1-4 Chapter 1
AX8 Series
Hardware Setup 2-1
Chapter 2. Hardware Setup
Before the Installation: Turn off the power supply switch (fully turn off the +5V standby power), or
disconnect the power cord before installing or unplugging any connectors or add-on cards. Failing to do
so may cause the motherboard components or add-on cards to malfunction or damaged.
2-1. Install The Motherboard
Most computer chassis have a base with many mounting holes to allow motherboard to be securely
attached on and at the same time, prevented from short circuits. There are two ways to attach the
motherboard to the chassis base:
1. use with studs
2. or use with spacers
In principle, the best way to attach the board is to
use with studs. Only if you are unable to do this
should you attach the board with spacers. Line up
the holes on the board with the mounting holes on
the chassis. If the holes line up and there are
screw holes, you can attach the board with studs.
If the holes line up and there are only slots, you
can only attach with spacers. Take the tip of the
spacers and insert them into the slots. After doing
this to all the slots, you can slide the board into
position aligned with slots. After the board has been positioned, check to make sure everything is OK
before putting the chassis back on.
ATTENTION: To prevent shorting the PCB circuit, please REMOVE the metal studs or spacers if they
are already fastened on the chassis base and are without mounting-holes on the motherboard to align with.
User’s Manual
2-2 Chapter 2
2-2. Install CPU and Heatsink
This motherboard provides a ZIF (Zero Insertion
Force) Socket 939 to install AMD Socket 939
CPU. The CPU you bought should contain with a
kit of heatsink, cooling fan, retention frame and
blackplate. If that’s not the case, buy one specially
designed for Socket 939.
Please refer to the figure shown here to install
CPU and heatsink. (For reference only. Your
Heatsink & Fan Assembly may not be exactly the
same as this one.)
1. Locate the Socket 939 on this motherboard.
Pull the CPU release lever sideways to
unlatch and then raise it all the way up.
2. Drop the processor with its pin side down into
the CPU socket. Do not use extra force to
insert CPU; it only fits in one direction. Close
the CPU release lever.
3. Align the Backplate Standoffs with the
mounting holes on motherboard. Position the
backplate onto motherboard.
4. Place the Retention Frame onto the
motherboard and align it with the Backplate
Standoffs.
5. Place heatsink on top of CPU, and make sure
the heatsink fits properly on the retention
frame.
6. Hook both sides of the Spring Clip onto the
Mounting Tabs of Retention Frame. Tighten
screws until the Spring Clip is fully installed.
7. Attach the fan connector of Heatsink & Fan
Assembly with the CPU-FAN connector on
the motherboard.
ATTENTION: Do not forget to set the correct
bus frequency and multiple for your processor.
AX8 Series
Hardware Setup 2-3
2-3. Install System Memory
This motherboard provides four 184-pin DDR DIMM slots for Single/Dual Channel DDR 400/333/266
memory modules with memory expansion size up to 4GB.
Table 2-1. Valid Memory Configurations
Bank Memory Module Total Memory
Bank 0, 1 (DIMM1) 256MB, 512MB, 1GB 256MB ~ 1GB
Bank 2, 3 (DIMM2) 256MB, 512MB, 1GB 256MB ~ 1GB
Bank 4, 5 (DIMM3) 256MB, 512MB, 1GB 256MB ~ 1GB
Bank 6, 7 (DIMM4) 256MB, 512MB, 1GB 256MB ~ 1GB
Total System Memory 256MB ~ 4GB
Table 2-2. Unbuffered DIMM Support For AMD 939-pin Processor
Data Bus DIMM1 DIMM2 DIMM3 DIMM4
Single rank N/A Empty N/A DDR400
Double rank N/A Empty N/A DDR400
Empty N/A Single rank N/A DDR400
64-bits
(Single
Channel)
128-bits
(Dual
Channel)
Empty N/A Double rank N/A DDR400
Single rank N/A Single rank N/A DDR400
Single rank N/A Double rank N/A DDR400
Double rank N/A Single rank N/A DDR400
Double rank N/A Double rank N/A DDR333
Single rank Single rank Empty Empty DDR400
Double rank Double rank Empty Empty DDR400
Empty Empty Single rank Single rank DDR400
Empty Empty Double rank Double rank DDR400
Single rank Single rank Single rank Single rank DDR400
Single rank Single rank Double rank Double rank DDR400
Double rank Double rank Single rank Single rank DDR400
To reach the performance of Dual Channel DDR, the following rules must be obeyed:
• When installing TWO DIMM modules: Install DIMM modules of the same type and size for
slots [DIMM1]+[DIMM2] or slots [DIMM3]+[DIMM4].
• When installing FOUR DIMM modules: Install DIMM modules of the same type and size for
slots [DIMM1]+[DIMM2], and slots [DIMM3]+[DIMM4].
NOTE: Usually there is no hardware or BIOS setup requires after adding or removing memory modules,
but you will have to clear the CMOS memory first if any memory module related problem occurs.
Power off the computer and unplug the AC power cord before installing or removing memory modules.
1. Locate the DIMM slot on the board.
2. Hold two edges of the DIMM module
carefully, keep away of touching its
connectors.
3. Align the notch key on the module with the
rib on the slot.
4. Firmly press the module into the slots until
the ejector tabs at both sides of the slot
automatically snaps into the mounting notch.
Do not force the DIMM module in with extra
force as the DIMM module only fit in one direction.
5. To remove the DIMM modules, push the two ejector tabs on the slot outward simultaneously, and
then pull out the DIMM module.
ATTENTION: Static electricity can damage the electronic components of the computer or optional
boards. Before starting these procedures, ensure that you are discharged of static electricity by touching a
grounded metal object briefly.
AX8 Series
Hardware Setup 2-5
p
2-4. Connectors, Headers and Switches
Here we will show you all of the connectors, headers and switches, and how to connect them. Please read
the entire section for necessary information before attempting to finish all the hardware installation inside
the computer chassis. A complete enlarged layout diagram is shown in Chapter 1 for all the position of
connectors and headers on the board that you may refer to.
WARNING: Always power off the computer and unplug the AC power cord before adding or removing
any peripheral or component. Failing to so may cause severe damage to your motherboard and/or
peripherals. Plug in the AC power cord only after you have carefully checked everything.
ATX Power Input Connectors
(1).
This motherboard provides two power connectors to connect to an ATX12V power supply.
NOTE: It is recommended to connect to a power supply with 350W, 20A +5VDC capacity at least for
heavily loaded system, and a 2A +5VSB capacity at least for supporting wake-up features.
The auxiliary 12V power connector [POWER1]
source for devices added on PCI Express slots. It is highly recommended to
attach 12V power from the power supplier for the best system stability.
rovides an additional power
User’s Manual
2-6 Chapter 2
(2). FAN Power Connectors
These connectors each provide power to the cooling fans installed in your system.
• CPUFAN1: CPU Fan Power Connector
• NBFAN1: Chipset Fan Power Connector
• SYSFAN1: System Fan Power Connector
• AUXFAN1: Auxiliary Fan Power Connector
WARNING: These fan connectors are not jumpers. DO NOT place jumper caps on these connectors.
AX8 Series
Hardware Setup 2-7
(3). CMOS Memory Clearing Header
This header uses a jumper cap to clear the CMOS memory.
• Pin 1-2 shorted (default): Normal operation.
• Pin 2-3 shorted: Clear CMOS memory.
WARNING: Turn the power off first (including the +5V standby power) before clearing the CMOS
memory. Failing to do so may cause your system to work abnormally or malfunction.
User’s Manual
2-8 Chapter 2
(4). Wake-up Header
These headers use a jumper cap to enable/disable the wake-up function.
• PS2-PWR1:
Pin 2-3 shorted (default): Enable wake-up function support at Keyboard/Mouse port.
Pin 1-2 shorted: Disable wake-up function support at Keyboard/Mouse port.
• USB-PWR1:
Pin 2-3 shorted (default): Enable wake-up function support at USB1 port.
Pin 1-2 shorted: Disable wake-up function support at USB1 port.
• USB-PWR2:
Pin 2-3 shorted (default): Enable wake-up function support at USB2 port.
Pin 1-2 shorted: Disable wake-up function support at USB2 port.
AX8 Series
Hardware Setup 2-9
(5). Front Panel Switches & Indicators Headers
This header is used for connecting switches and LED indicators on the chassis front panel.
Watch the power LED pin position and orientation. The mark “+” align to the pin in the figure below
stands for positive polarity for the LED connection. Please pay attention to connect these headers. A
wrong orientation will only cause the LED not lighting, but a wrong connection of the switches could
cause system malfunction.
• HLED (Pin 1, 3):
Connects to the HDD LED cable of chassis front panel.
• RST (Pin 5, 7):
Connects to the Reset Switch cable of chassis front panel.
• SPKR (Pin 13, 15, 17, 19):
Connects to the System Speaker cable of chassis.
• SLED (Pin 2, 4):
Connects to the Suspend LED cable (if there is one) of chassis front panel.
• PWR (Pin 6, 8):
Connects to the Power Switch cable of chassis front panel.
• PLED (Pin 16, 18, 20):
Connects to the Power LED cable of chassis front panel.
User’s Manual
2-10 Chapter 2
(6). Additional USB Port Headers
These headers each provide 2 additional USB 2.0 ports connection through an USB cable designed for
USB 2.0 specifications.
Pin Pin Assignment Pin Pin Assignment
1 VCC 2 VCC
3 - Data 0 4 - Data 1
5 + Data 0 6 + Data 1
7 Ground 8 Ground
10 NC
AX8 Series
Hardware Setup 2-11
Additional IEEE1394 Port Headers (AX8-3rd Eye/AX8) (7).
This header provides one additional IEEE1394 port connection through an extension cable and bracket.
Pin Pin AssignmentPin Pin Assignment
1 TPA0 + 2 TPA0 -
3 GND 4 GND
5 TPB0 + 6 TPB0 -
7 +12V 8 +12V
9 NC 10 GND
User’s Manual
2-12 Chapter 2
(8). Front Panel Audio Connection Header
This header provides the connection to audio connector at front panel.
• To use the audio connector at front panel, remove all the jumpers on this header, and then connect
to front panel by the extension cable provided with the chassis.
• To use the audio connector at rear panel, disconnect the extension cable, attach the jumpers back at
pin 5-6, and pin 9-10 (default setting).
Pin Pin Assignment Pin Pin Assignment
1 Audio Mic. 2 Ground
3 Audio Mic. Bias 4 VCC
Speaker Out Right
5
Channel
7 X 8 NC
Speaker Out Left
9
Channel
Speaker Out Right
6
Channel Return
Speaker Out Left
10
Channel Return
AX8 Series
Hardware Setup 2-13
(9). Internal Audio Connectors
These connectors connect to the audio output of internal CD-ROM drive or add-on card.
GURU Clock Connection Header
(10).
This header is reserved for connecting ABIT’s exclusive GURU Clock.
User’s Manual
2-14 Chapter 2
(11). PCI Express x16 Slot
This slot is used to attach the next generation of graphics architecture.
PCI Express x1 Slots
(12).
These slots are used to attach the next generation of I/O architecture.
AX8 Series
Hardware Setup 2-15
(13). Floppy and IDE Disk Drive Connectors
The FDC1 connector connects up to two floppy drives with a 34-wire, 2-connector floppy cable. Connect
the single end at the longer length of ribbon cable to the FDC1 on the board, the two connectors on the
other end to the floppy disk drives connector. Generally you need only one floppy disk drive in your
system.
NOTE: The red line on the ribbon cable must be aligned with pin-1 on both the FDC1 port and the floppy
connector.
Each of the IDE port connects up to two IDE drives at
Ultra ATA/100 mode by one 40-pin, 80-conductor, and
3-connector Ultra ATA/66 ribbon cables.
Connect the single end (blue connector) at the longer
length of ribbon cable to the IDE port of this board, the
other two ends (gray and black connector) at the shorter
length of the ribbon cable to the connectors of your hard
drives.
NOTE: Make sure to configure the “Master” and “Slave”
relation before connecting two drives by one single ribbon
cable. The red line on the ribbon cable must be aligned with pin-1 on both the IDE port and the hard-drive
connector.
rd
For models “AX8-3
Eye” and “AX8”, a third IDE port is supported
via [IDE3] connector, making “RAID 0”, “RAID 1”, “RAID 0+1”,
and “JBOD” services possible via the combination of connectors
[SATA3], [SATA4], and [IDE3] besides their regular SATA and
PATA connection.
User’s Manual
2-16 Chapter 2
(14). POST Code Display
This is an LED device to display the “POST” Code, the acronym of Power On Self Test. The computer
will execute the POST action whenever you power on the computer. The POST process is controlled by
the BIOS. It is used to detect the status of the computer’s main components and peripherals. Each POST
Code corresponds to different checkpoints that are also defined by the BIOS in advance. For example,
“memory presence test” is an important checkpoint and its POST Code is “C1”. When the BIOS execute
any POST item, it will write the corresponding POST Code into the address 80h. If the POST passes, the
BIOS will process the next POST item and write the next POST Code into the address 80h. If the POST
fails, we can check the POST Code in address 80h to find out where the problem lies.
This LED device also displays the “POST” Code of AC2003, an “uGuru” chipset developed exclusively
by ABIT computer.
NOTE: The decimal point lights up when executing the AC2003 POST action.
See Appendix for both AWARD and AC2003 POST Code definition.
AX8 Series
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