Intel GA-8I915G DUO User Manual

GA-8I915G Duo

Intel® Pentium® 4 LGA775 Processor Motherboard

User's Manual

Rev. 1303

12ME-8I915GDUO-1303

Sep. 1, 2004

GA-8I915G Duo

Motherboard

Sep. 1, 2004

GA-8I915G Duo

Motherboard

The trademarks mentioned in the manual are legally registered to their respective companies.

Notice

The written content provided with this product is the property of Gigabyte.

No part of this manual may be reproduced, copied, translated, or transmitted in any form or by any

means without Gigabyte's prior written permission. Specifications and features are subject to

change without prior notice.

Product Manual Classification

In order to assist in the use of this product, Gigabyte has categorized the user manual in the

following:

 For quick installation, please refer to the "Hardware Installation Guide" included with the

product.

 For detailed product information and specifications, please carefully read the

"Product User Manual".

 For detailed information related to Gigabyte's unique features, please go to Gigabyte's

website under "Technology Guide" where information can be downloaded in .pdf format.

For more product details, please click onto Gigabyte's website at www.gigabyte.com.tw

Table of Contents

GA-8I915G Duo Motherboard Layout ........................................................................... 6

Block Diagram ............................................................................................................... 7

Chapter 1 Hardware Installation.................................................................................... 9

1-1 Considerations Prior to Installation ................................................................. 9

1-2 Feature Summary .......................................................................................... 10

1-3 Installation of the CPU and Heatsink ............................................................ 12

1-3-1 Installation of the CPU .......................................................................................... 12

1-3-2 Installation of the Heatsink ................................................................................... 13

1-4 Installation of Memory ................................................................................... 14

1-5 Installation of Expansion Cards .................................................................... 16

1-6 I/O Back Panel Introduction .......................................................................... 17

1-7 Connectors Introduction ................................................................................ 18

Chapter 2 BIOS Setup ............................................................................................... 29

The Main Menu (For example: BIOS Ver. : F4) ....................................................... 30

2-1 Standard CMOS Features ............................................................................. 32

2-2 Advanced BIOS Features ............................................................................. 34

2-3 Integrated Peripherals ................................................................................... 36

2-4 Power Management Setup ............................................................................ 39

2-5 PnP/PCI Configurations ................................................................................ 41

2-6 PC Health Status ........................................................................................... 42

2-7 MB Intelligent Tweaker(M.I.T.) ...................................................................... 43

2-8 Load Fail-Safe Defaults ................................................................................ 45

2-9 Load Optimized Defaults ............................................................................... 45

2-10 Set Supervisor/User Password ..................................................................... 46

2-11 Save & Exit Setup ......................................................................................... 47

2-12 Exit Without Saving ....................................................................................... 47

- 4 -

Chapter 3 Install Drivers ............................................................................................ 49

3-1 Install Chipset Drivers ................................................................................... 49

3-2 Software Applications .................................................................................... 50

3-3 Driver CD Information ................................................................................... 50

3-4 Hardware Information .................................................................................... 51

3-5 Contact Us ..................................................................................................... 51

Chapter 4 Appendix ................................................................................................... 53

4-1 Unique Software Utilities ............................................................................... 53

4-1-1 Xpress Recovery Introduction .............................................................................. 54

4-1-2 Flash BIOS Method Introduction .......................................................................... 57

4-1-4 2 / 4 / 5.1 / 7.1 Channel Audio Function Introduction ......................................... 66

4-2 Troubleshooting............................................................................................. 72

- 5 -

GA-8I915G Duo Motherboard Layout

KB_MS

SPDIF_O

SPDIF_I

VGA

USB

AUDIO1

AUDIO2

AZALIA_FP

Broadcom

5751/5789

LPT

LAN2

CODEC

CD_IN

IT8712

ATX_12V

COMA

NB_FAN

PCIE_1

PCIE_2

PWR_FAN

DDR2

DDRII_2

DDR1

LGA775

CPU_FAN

Intel 915G

DDRII_1

ATX

IDE1

GA-8I915G Duo

S_ATA3

S_ATA0

SYS_FAN

FDD

F_PANEL

IDE3

IDE2

PCIE_16

BIOS

BAT

PCI1

PCI2

PCI3

ICH6

S_ATA2 S_ATA1

F_USB1

CLR_CMOS

VT6410

F_USB2

PWR_LED

- 6 -

Block Diagram

PCI-ECLK

(100MHz)

PCI-ECLK

(100MHz)

3 PCI

VGA

PCI Express x16

RJ45

2 PCI Express x 1 Ports

PCI Express x1 Bus

Broadcom 5751/5789

PCI Bus

VT6410

IDE RAID

IDE2/IDE3

LGA775

Processor

Intel 915G MCH

Intel

ICH6

CODEC

MIC

Line-Out

CPUCLK+/-(200/133MHz)

Host

Interface

8 USB

Ports

Line-In

SPDIF In

SPDIF Out

DDR 400/333MHz DIMM

Dual Channel Memory

DDRII 600

MCHCLK (133/200MHz)

(Note)

/533/400MHz DIMM

Dual Channel Memory

66MHz 33MHz

14.318MHz 48MHz

BIOS

4 Serial ATA

ATA33/66/100

IDE1 Channels

IT 8712

24MHz

33MHz

PS/2 KB/Mouse

Floppy

LPT Port

COMA

PCICLK

(33MHz)

(Note) To use a DDRII 600 memory module on the motherboard, you must install an 800MHz FSB

processor and overclock in BIOS.

Surround Speaker Out

Back Surround Speaker Out

Center/Subwoofer Speaker Out

- 7 -

- 8 -

Chapter 1 Hardware Installation

1-1 Considerations Prior to Installation

Preparing Your Computer

The motherboard contains numerous delicate electronic circuits and components which can become damaged as a result of electrostatic discharge (ESD). Thus, prior to installation, please follow the instructions below:

1. Please turn off the computer and unplug its power cord.

2. When handling the motherboard, avoid touching any metal leads or connectors.

3. It is best to wear an electrostatic discharge (ESD) cuff when handling electronic components (CPU, RAM).

4. Prior to installing the electronic components, please have these items on top of an antistatic pad or within a electrostatic shielding container.

5. Please verify that you the power supply is switched off before unplugging the power supply connector from the motherboard.

Installation Notices

1. Prior to installation, please do not remove the stickers on the motherboard. These stickers are required for warranty validation.

2. Prior to the installation of the motherboard or any hardware, please first carefully read the information in the provided manual.

3. Before using the product, please verify that all cables and power connectors are connected.

4. To prevent damage to the motherboard, please do not allow screws to come in contact with the motherboard circuit or its components.

5. Please make sure there are no leftover screws or metal components placed on the motherboard or within the computer casing.

6. Please do not place the computer system on an uneven surface.

7. Turning on the computer power during the installation process can lead to damage to system components as well as physical harm to the user.

8. If you are uncertain about any installation steps or have a problem related to the use of the product, please consult a certified computer technician.

English

Instances of Non-Warranty

1. Damage due to natural disaster, accident or human cause.

2. Damage as a result of violating the conditions recommended in the user manual.

3. Damage due to improper installation.

4. Damage due to use of uncertified components.

5. Damage due to use exceeding the permitted parameters.

6. Product determined to be an unofficial Gigabyte product.

Hardware Installation- 9 -

English

1-2 Feature Summary

CPU  Supports the latest Intel® Pentium® 4 LGA775 CPU

 Supports 800/533MHz FSB  L2 cache varies with CPU

Chipset  Northbridge: Intel® 915G Express Chipset

 Southbridge: Intel® ICH6

Memory  2 DDR DIMM memory slots (supports up to 4GB memory)

 Supports 2.5V DDR DIMM  Supports dual channel DDR 400/333 DIMM  2 DDR II DIMM memory slots (supports up to 4GB memory)  Supports 1.8V DDR II DIMM  Supports dual channel DDR II 600

(Note 2)

/533/400 DIMM (Note: Mixed mode, populating DDR and DDR II memory modules simultaneously is not supported.)

Slots  1 PCI Express x 16 slot

 2 PCI Express x 1 slots  3 PCI slots

IDE Connections  1 IDE connection (UDMA 33/ATA 66/ATA 100), allows connection of 2

IDE devices(IDE1)

 2 IDE connection (UDMA 33/ATA 66/ATA 100/ATA 133), compatible with

RAID, allows connection of 4 IDE devices(IDE2, IDE3)

FDD Connections  1 FDD connection, allows connection of 2 FDD devices Onboard SATA  4 Serial ATA connections Peripherals  1 parallel port supporting Normal/EPP/ECP mode

 1 VGA port, onboard COMA connection  8 USB 2.0/1.1 ports (rear x 4, front x 4 via cable)  1 front audio connector  1 IR connector  1 PS/2 keyboard port  1 PS/2 mouse port

Onboard VGA  Built-in Intel® 915G Onboard LAN  Onboard Broadcom 5751/5789 chip (10/100/1000 Mbit)

 1 RJ 45 port

(Note 1)

(Note 3)

(Note 1) Due to standard PC architecture, a certain amount of memory is reserved for system usage and

therefore the actual memory size is less than the stated amount. For example, 4 GB of memory size will instead be shown as 3.xxGB memory during system startup.

(Note 2) To use a DDRII 600 memory module on the motherboard, you must install an 800MHz FSB

processor and overclock in BIOS.

(Note 3) Only support ATAPI mode for HDD.

GA-8I915G Duo Motherboard - 10 -

Onboard Audio  C-Media 9880 CODEC (UAJ)

 Supports Jack Sensing function  Supports 2 / 4 / 5.1 / 7.1 channel audio  Supports Line In ; Line Out ; MIC ; Back Surround Speaker Out ;

Center/Subwoofer Speaker Out ; Surround Speaker Out connection

 Supports SPDIF In/Out connection  CD In

On-Board IDE RAID  Built-in VT6410 chipset (IDE2, IDE3)  Supports disk striping (RAID 0) or disk mirroring (RAID 1) or

striping + mirroring (RAID 0 + RAID 1)

 Supports JBOD function  Supports concurrent dual ATA133 IDE controller operation  Supports ATAPI mode for HDD  Supports IDE bus master operation  Displays status and error checking messages during boot-up  Mirroring supports automatic background rebuilds  Features LBA and Extended Interrupt 13 drive translation in

controller onboard BIOS I/O Control  IT8712 Hardware Monitor  System voltage detection

 CPU temperature detection  CPU / System / Power fan speed detection  CPU warning temperature  CPU / System / Power fan failure warning  CPU smart fan control

BIOS  Use of licensed AWARD BIOS

 Supports Q-Flash

Additional Features  Supports @BIOS

 Supports EasyTune

Overclocking  Over Voltage via BIOS (CPU/DDR/PCI-E)

 Over Clock via BIOS (CPU/DDR)

Form Factor  ATX form factor; 30.5cm x 24.4cm

English

Hardware Installation- 11 -

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1-3 Installation of the CPU and Heatsink

Before installing the CPU, please comply with the following conditions:

1. Please make sure that the motherboard supports the CPU.

2. Please take note of the one indented corner of the CPU. If you install the CPU in the wrong direction, the CPU will not insert properly. If this occurs, please change the insert direction of the CPU.

3. Please add an even layer of heat sink paste between the CPU and heatsink.

4. Please make sure the heatsink is installed on the CPU prior to system use, otherwise overheating and permanent damage of the CPU may occur.

5. Please set the CPU host frequency in accordance with the processor specifications. It is not recommended that the system bus frequency be set beyond hardware specifications since it does not meet the required standards for the peripherals. If you wish to set the frequency beyond the proper specifications, please do so according to your hardware specifications including the CPU, graphics card, memory, hard drive, etc.

HT functionality requirement content :

Enabling the functionality of Hyper-Threading Technology for your computer system requires all of the following platform components:

- CPU: An Intel® Pentium 4 Processor with HT Technology

- Chipset: An Intel® Chipset that supports HT Technology

- BIOS: A BIOS that supports HT Technology and has it enabled

- OS: An operation system that has optimizations for HT Technology

1-3-1 Installation of the CPU

Metal Lever

Fig. 1 Gently lift the metal lever located on the CPU socket to the upright position.

Fig. 2 Remove the plastic covering on the CPU socket.

Fig. 3 Notice the small gold colored triangle located on the edge of the CPU socket. Align the indented corner of the

CPU with the triangle and gently insert the CPU into position. (Grasping the CPU firmly between your thumb and forefinger, carefully place it into the socket in a straight and downwards motion. Avoid twisting or bending motions that might cause damage to the CPU during installation.)

GA-8I915G Duo Motherboard - 12 -

Fig. 4 Once the CPU is properly inserted, please replace the load plate and push the metal lever back into its original position.

1-3-2 Installation of the Heatsink

English

Male Push Pin

The top of Female Push Pin

Female Push Pin

Fig.1 Please apply an even layer of heatsink paste on the surface of the installed CPU.

Fig. 3 Place the heatsink atop the CPU and make sure the push pins aim to the pin hole on the motherboard.Pressing down the push pins diagonally.

Fig. 5 Please check the back of motherboard after installing. If the push pin is inserted as the picture, the installation is complete.

Fig. 2 (Turning the push pin along the direction of arrow is to remove the heatsink, on the contrary, is to install.) Please note the direction of arrow sign on the male push pin doesn't face inwards before installation. (This instruction is only for Intel boxed fan)

Fig. 4 Please make sure the Male and Female push pin are joined closely. (for detailed installation instructions, please refer to the heatsink installation section of the user manual)

Fig. 6 Finally, please attach the power connector of the heatsink to the CPU fan header located on the motherboard.

The heatsink may adhere to the CPU as a result of hardening of the heatsink paste.To prevent such an occurrence, it is suggested that either thermal tape rather than heat sink paste be used for heat dissipation or using extreme care when removing the heatsink.

Hardware Installation- 13 -

1-4 Installation of Memory

English

Before installing the memory modules, please comply with the following conditions:

1. Please make sure that the memory used is supported by the motherboard. It is recommended that memory of similar capacity, specifications and brand be used.

2. Before installing or removing memory modules, please make sure that the computer power is switched off to prevent hardware damage.

3. Memory modules have a foolproof insertion design. A memory module can be installed in only one direction. If you are unable to insert the module, please switch the direction.

The motherboard supports DDR II & DDR memory modules, whereby BIOS will automatically detect memory capacity and specifications. Memory modules are designed so that they can be inserted only in one direction. The memory capacity used can differ with each slot.

DDR

Notch

DDR II

Fig.1 The DIMM socket has a notch, so the DIMM memory module can only fit in one direction. Insert the DIMM memory module vertically into the DIMM socket. Then push it down.

Fig.2 Close the plastic clip at both edges of the DIMM sockets to lock the DIMM module. Reverse the installation steps when you wish to remove the DIMM module.

GA-8I915G Duo Motherboard - 14 -

Dual Channel DDR/DDR II

GA-8I915G Duo supports the Dual Channel Technology. After operating the Dual Channel Technology, the bandwidth of Memory Bus will add double up to 6.4GB/s(DDR) ; 8.5GB(DDRII) GA-8I915G Duo includes 4 DIMM sockets, and each Channel has two DIMM sockets as following:

Channel A : DDR 1 or Channel A : DDR II 1

Channel B : DDR 2 Channel B : DDR II 2 If you want to operate the Dual Channel Technology, please note the following explanations due to the limitation of Intel chipset specifications.

1. One DDR/DDR II memory module is installed: The Dual Channel Technology can't operate

when only one DDR/DDR II memory module is installed.

2. Two DDR/DDR II memory modules are installed (the same memory size and type): The Dual

Channel Technology will operate when two memory modules are inserted individually into Channel A and B. If you install two memory modules in the same channel, the Dual Channel Technology will not operate.

We'll strongly recommend our user to slot two DDR/DDR II memory modules into the DIMMs with the same color in order for Dual Channel Technology to work. The following table is for Dual Channel Technology combination: (DS: Double Side, SS: Single Side)

DDR 1 DDR 2

2 memory modules

Note:Mixed mode, populating DDR and DDR II memory modules simultaneously is not supported.

DS/SS DS/SS

DDR II 1 DDR II 2

DS/SS DS/SS

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Hardware Installation- 15 -

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1-5 Installation of Expansion Cards

You can install your expansion card by following the steps outlined below:

1. Read the related expansion card's instruction document before install the expansion card into the computer.

2. Remove your computer's chassis cover, screws and slot bracket from the computer.

3. Press the expansion card firmly into expansion slot in motherboard.

4. Be sure the metal contacts on the card are indeed seated in the slot.

5. Replace the screw to secure the slot bracket of the expansion card.

6. Replace your computer's chassis cover.

7. Power on the computer, if necessary, setup BIOS utility of expansion card from BIOS.

8. Install related driver from the operating system.

Installing a PCI Express x 16 expansion card:

Please carefully pull out the small whitedrawable bar at the end of the PCI Express x 16 slot when you try to install/Uninstall the VGA card. Please align the VGA card to the onboard PCI Express x 16 slot and press firmly down on the slot .Make sure your VGA card is locked by the small white-drawable bar.

GA-8I915G Duo Motherboard - 16 -

1-6 I/O Back Panel Introduction

PS/2 Keyboard and PS/2 Mouse Connector

To install a PS/2 port keyboard and mouse, plug the mouse to the upper port (green) and the keyboard to the lower port (purple).

Parallel Port

The parallel port allows connection of a printer, scanner and other peripheral devices.

SPDIF_O (SPDIF Out)

The SPDIF output is capable of providing digital audio to external speakers or compressed AC3 data to an external Dolby Digital Decoder.

SPDIF_I (SPDIF In)

Use SPDIF In feature only when your device has digital output function.

VGA Port

Monitor can be connected to VGA port.

USB port

Before you connect your device(s) into USB connector(s), please make sure your device(s) such as USB keyboard, mouse, scanner, zip, speaker...etc. have a standard USB interface. Also make sure your OS supports USB controller. If your OS does not support USB controller, please contact OS vendor for possible patch or driver upgrade. For more information please contact your OS or device(s) vendors.

LAN Port

The provided Internet connection is Gigabit Ethernet, providing data transfer speeds of 10/100/1000Mbps.

Line In

Devices like CD-ROM, walkman etc. can be connected to Line In jack.

Line Out (Front Speaker Out)

Connect the stereo speakers, earphone or front surround channels to this connector.

MIC In

Microphone can be connected to MIC In jack.

Back Surround Speaker Out

Connect the back surround channels to this connector.

English

Hardware Installation- 17 -

English

Center/Subwoofer Speaker Out

Connect the Center/Subwoofer channels to this connector.

Surround Speaker Out

Connect the surround channels to this connector.

You can use audio software to configure 2-/4-/5.1-/7.1-channel audio functioning.

1-7 Connectors Introduction

1) ATX_12V

2) ATX (Power Connector)

3) CPU_FAN

4) SYS_FAN

5) PWR_FAN

6) NB_FAN

7) FDD

8) IDE1

9) IDE2/IDE3

10) S_ATA0 / S_ATA1 / S_ATA2 / S_ATA3

11) PWR_LED

12) F_PANEL

13) AZALIA_FP

14) CD_IN

15) F_USB1 / F_USB2

16) COM A

17) IR

18) CLR_CMOS

19) BAT

GA-8I915G Duo Motherboard - 18 -

1/2) ATX_12V/ATX (Power Connector)

With the use of the power connector, the power supply can supply enough stable power to all the components on the motherboard. Before connecting the power connector, please make sure that all components and devices are properly installed. Align the power connector with its proper location on the motherboard and connect tightly. The ATX_12V power connector mainly supplies power to the CPU. If the ATX_12V power connector is not connected, the system will not start. Caution! Please use a power supply that is able to handle the system voltage requirements. It is recommended that a power supply that can withstand high power consumption be used (300W or greater). If a power supply is used that does not provide the required power, the result can lead to an unstable system or a system that is unable to start. If you use a 24-pin ATX power supply, please remove the small cover on the power connector

on the motherboard before plugging in the power cord ; Otherwise, please do not remove it.

English

Pin No. Definition

1 GND

2 GND

3 +12V

4 +12V

Pin No. Definition

1 3.3V

2 3.3V

3 GND

4 VCC

5 GND

6 VCC

7 GND

8 Power Good

9 5V SB(stand by +5V)

10 +12V

11 +12V

12 3.3V(Only for 24pins ATX)

13 3.3V

14 -12V

15 GND

16 PS_ON(soft On/Off)

17 GND

18 GND

19 GND

20 -5V

21 VCC

22 VCC

23 VCC

24 GND

Hardware Installation- 19 -

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3/4/5) CPU_FAN / SYS_FAN / PWR_FAN (Cooler Fan Power Connector)

The cooler fan power connector supplies a +12V power voltage via a 3-pin/4-pin (only for CPU_FAN) power connector and possesses a ful-proof connection design. Most coolers are designed with color-coded power connector wires. A red power connector wire indicates a positive connection and requires a +12V power voltage. The black connector wire is the ground wire (GND). Please remember to connect the power to the cooler to prevent system overheating and failure. Caution! Please remember to connect the power to the CPU fan to prevent CPU overheating and failure.

CPU_FAN

PWR_FAN

Pin No. Definition

1 GND

2 +12V

3 Sense

4 Speed Control

(Only for CPU_FAN)

SYS_FAN

6) NB_FAN (Chip Fan Connector)

If you installed wrong direction, the chip fan will not work. Sometimes will damage the chip fan. (Usually black cable is GND)

GA-8I915G Duo Motherboard - 20 -

Pin No. Definition

1 +12V

2 GND

7) FDD (Floppy Connector)

The FDD connector is used to connect the FDD cable while the other end of the cable connects to the FDD drive. The types of FDD drives supported are: 360KB, 720KB, 1.2MB, 1.44MB and 2.88MB. Please connect the red power connector wire to the pin1 position.

English

8/9) IDE1/IDE2/IDE3 (IDE Connector)

An IDE device connects to the computer via an IDE connector. One IDE connector can connect to one IDE cable, and the single IDE cable can then connect to two IDE devices (hard drive or optical drive). If you wish to connect two IDE devices, please set the jumper on one IDE device as Master and the other as Slave (for information on settings, please refer to the instructions located on the IDE device). To ensure that an IDE CD-ROM drive can work properly, please attach it to the IDE 1 connector.

3940

Hardware Installation- 21 -

English

10) S_ATA0/S_ATA1/S_ATA2/S_ATA3 (Serial ATA Connector)

Serial ATA can provide 150MB/s transfer rate. Please refer to the BIOS setting for the Serial ATA and install the proper driver in order to work properly.

Pin No. Definition

1 GND

2 TXP

3 TXN

4 GND

5 RXN

6 RXP

7 GND

11) PWR_LED

PWR_LED is connect with the system power indicator to indicate whether the system is on/off. It will blink when the system enters suspend mode.

GA-8I915G Duo Motherboard - 22 -

Pin No. Definition

1 MPD+

2 MPD-

3 MPD-

12) F_PANEL (Front Panel Jumper)

Please connect the power LED, PC peaker, reset switch and power switch etc of your chassis front panel to the F_PANEL connector according to the pin assignment below.

English

Message LED/

Power/

Sleep LED

Power

Switch

PW+

MSG+

PW-

MSG-

2 1

HD-

RES+

HD+

RES-

Reset Switch

IDE Hard Disk Active LED

HD (IDE Hard Disk Active LED) Pin 1: LED anode(+)

(Blue) Pin 2: LED cathode(-)

SPEAK (Speaker Connector) Pin 1: VCC(+)

(Amber) Pin 2- Pin 3: NC

Pin 4: Data(-)

RES (Reset Switch) Open: Normal Operation

(Green) Close: Reset Hardware System

PW (Power Switch) Open: Normal Operation

(Red) Close: Power On/Off

MSG(Message LED/Power/Sleep LED) Pin 1: LED anode(+)

(Yellow) Pin 2: LED cathode(-)

NC( Purple) NC

Speaker Connector

SPEAK+

SPEAK-

20 19

Hardware Installation- 23 -

English

13) AZALIA_FP(Front Audio Panel Connector)

This connector is supported to connect HD(High Definition) Audio and AC'97 Audio. Check the pin assignment carefully while you connect the audio panel cable, incorrect connection between the cable and connector will make the device unable to work or even damage it. For optional audio panel cable, please contact your local dealer.

HD Audio: AC'97 Audio:

Pin No. Definition

1 MIC2_L

2 GND

3 MIC2_R

4 -ACZ_DET

5 Line2_R

6 FSENSE1

7 FAUDIO_JD

8 No Pin

9 LINE2_L

10 FSENSE2

HD Audio is the default setting for this connector. To enable AC'97 Audio, from BIOS settings, set Front Panel Type under Integrated Peripherals to AC97.

Pin No. Definition

1 MIC

2 GND

3 MIC Power

4 N/A

5 Line Out (R)

6 N/A

7 N/A

8 No Pin

9 Line Out (L)

10 N/A

14) CD_IN (CD IN)

Connect CD-ROM or DVD-ROM audio out to the connector.

GA-8I915G Duo Motherboard - 24 -

Pin No. Definition

1 CD-L

2 GND

3 GND

4 CD-R

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