Asus AT3GC-I - Motherboard - Mini ITX User manual

Motherboard
AT3GC-I

ii
Copyright © 2009 ASUSTeK Computer Inc. All Rights Reserved.
No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any
means, except documentation kept by the purchaser for backup purposes, without the express written
permission of ASUSTeK Computer Inc. (“ASUS”).
Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
such repair, modication 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 identication or explanation and to the
owners’ benet, without intent to infringe.
E4628
First Edition V1
June 2009

iii
Contents
Notices.......................................................................................................... v
Safety information ...................................................................................... vi
About this guide ......................................................................................... vi
AT3GC-I specications summary............................................................ viii
Chapter 1: Product introduction
1.1 Before you proceed ..................................................................... 1-1
1.2 Motherboard overview................................................................. 1-2
1.2.1 Motherboard layout ......................................................... 1-2
1.2.2 Layout contents............................................................... 1-2
1.3 Central Processing Unit (CPU) ................................................... 1-3
1.4 System memory ........................................................................... 1-3
1.4.1 Overview ......................................................................... 1-3
1.4.2 Memory congurations.................................................... 1-3
1.5 Expansion slots............................................................................ 1-4
1.5.1 Installing an expansion card ........................................... 1-4
1.5.2 Conguring an expansion card ....................................... 1-4
1.5.3 PCI slot ........................................................................... 1-4
1.6 Jumpers ........................................................................................ 1-5
1.7 Connectors ................................................................................... 1-7
1.7.1 Rear panel ports ............................................................. 1-7
1.7.2 Internal connectors ......................................................... 1-8
1.8 Software support........................................................................ 1-14
1.8.1 Installing an operating system ...................................... 1-14
1.8.2 Support DVD information .............................................. 1-14
Chapter 2: BIOS information
2.1 Managing and updating your BIOS ............................................ 2-1
2.1.1 ASUS Update utility ........................................................ 2-1
2.1.2 ASUS EZ Flash 2 utility................................................... 2-2
2.1.3 ASUS CrashFree BIOS 3 utility ...................................... 2-3
2.2 BIOS setup program .................................................................... 2-4
2.3 Main menu .................................................................................... 2-4
2.3.1 System Time ................................................................... 2-4

iv
Contents
2.3.2 System Date ................................................................... 2-4
2.3.3 Primary IDE Master/Slave............................................... 2-5
2.3.4 SATA 1-2 ......................................................................... 2-5
2.3.5 Storage Conguration ..................................................... 2-6
2.3.6 System Information ......................................................... 2-6
2.4 Advanced menu ........................................................................... 2-7
2.4.1 USB Conguration .......................................................... 2-7
2.4.2 CPU Conguration .......................................................... 2-8
2.4.3 Chipset............................................................................ 2-8
2.4.4 Onboard Devices Conguration...................................... 2-9
2.4.5 PCI PnP ........................................................................ 2-10
2.5 Power menu................................................................................ 2-10
2.5.1 Suspend Mode...............................................................2-11
2.5.2 ACPI 2.0 Support ..........................................................2-11
2.5.3 ACPI APIC Support [Enabled]........................................2-11
2.5.4 APM Conguration.........................................................2-11
2.5.5 HW Monitor Conguration............................................. 2-12
2.6 Boot menu .................................................................................. 2-12
2.6.1 Boot Device Priority ...................................................... 2-13
2.6.2 Boot Settings Conguration .......................................... 2-13
2.6.3 Security ......................................................................... 2-13
2.7 Tools menu ................................................................................. 2-15
2.7.1 ASUS EZ Flash 2.......................................................... 2-15
2.7.2 AI NET 2........................................................................ 2-15
2.8 Exit menu.................................................................................... 2-15

v
Notices
Federal Communications Commission Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
• This device may not cause harmful interference, and
• This device must accept any interference received including interference that may cause
undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with manufacturer’s instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur
in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
The use of shielded cables for connection of the monitor to the graphics card is required
to assure compliance with FCC regulations. Changes or modications 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.
REACH
Complying with the REACH (Registration, Evaluation, Authorisation, and Restriction of
Chemicals) regulatory framework, we published the chemical substances in our products at
ASUS REACH website at http://green.asus.com/english/REACH.htm
DO NOT throw the motherboard in municipal waste. This product has been designed to
enable proper reuse of parts and recycling. This symbol of the crossed out wheeled bin
indicates that the product (electrical and electronic equipment) should not be placed in
municipal waste. Check local regulations for disposal of electronic products.
DO NOT throw the mercury-containing button cell battery in municipal waste. This symbol
of the crossed out wheeled bin indicates that the battery should not be placed in municipal
waste.

vi
Safety information
Electrical safety
• To prevent electric shock hazard, disconnect the power cable from the electric outlet
before relocating the system.
• When adding or removing devices to or from the system, ensure that the power cables
for the devices are unplugged before the signal cables are connected. If possible,
disconnect all power cables from the existing system before you add a device.
• Before connecting or removing signal cables from the motherboard, ensure that all
power cables are unplugged.
• Seek professional assistance before using an adapter or extension cord. These devices
could interrupt the grounding circuit.
• Ensure 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 x it by yourself. Contact a qualied 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, ensure that 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 at and stable surface.
• If you encounter technical problems with the product, contact a qualied service
technician or your retailer.
About this guide
This user guide contains the information you need when installing and conguring the
motherboard.
How this guide is organized
This guide contains the following parts:
• Chapter 1: Product introduction
This chapter describes the features of the motherboard and the new technology it
supports.
• Chapter 2: BIOS information
This chapter tells how to change system settings through the BIOS setup menus.
Detailed descriptions of the BIOS parameters are also provided.

vii
Conventions used in this guide
To ensure that you perform certain tasks properly, take note of the following symbols used
throughout this manual.
DANGER/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.
NOTE: Tips and additional information to help you complete a task.
IMPORTANT: Instructions that you MUST follow to complete a task.
Where to nd more information
Refer to the following sources for additional information and for product and software
updates.
1. ASUS websites
The ASUS website provides updated information on ASUS hardware and software
products.
2. Optional documentation
Your product package may include optional documentation, such as warranty yers,
that may have been added by your dealer. These documents are not part of the
standard package.
Typography
Bold text Indicates a menu or an item to select.
Italics Used to emphasize a word or a phrase.
<Key> Keys enclosed in the less-than and greater-than sign means
that you must press the enclosed key.
Example: <Enter> means that you must press the Enter or
Return key.
<Key1>+<Key2>+<Key3> If you must press two or more keys simultaneously, the key
names are linked with a plus sign (+).
Example: <Ctrl>+<Alt>+<D>

viii
CPU Integrated dual-core Intel® Atom™ processor 330
Chipset Northbridge: Intel® 945GC
Southbridge: Intel® ICH7
North Bridge Fan Dimension of Fan: 40mm x 40mm x 10mm
Rated Speed: 5000 + 10% R.P.M
Voltage (V): DC 12V
Maximum Air Flow: 5.57CFM
Noise: 25.3dBA (Max. 27.5 dBA)
Front Side Bus 533 MHz
Memory Single-channel memory architecture
1 x 240-pin DIMM slot supports unbuffered non-ECC
DDR2 533 MHz memory module
Supports up to 2GB system memory
* Refer to www.asus.com for the latest Memory QVL
(Qualied Vendors List).
Graphics Integrated Intel Graphics Media Accelerator 950
D-Sub Max. resolution: 2048 x 1536 x 32Bpp x 75Hz
Maximum shared memory of 224MB
Expansion slots 1 x PCI slot
Storage 1 x UltraDMA 100/66 connector
2 x Serial ATA 3Gb/s connectors
Audio VIA VT 1705 High Denition Audio 6-channel CODEC
USB Supports up to 8 USB 2.0/1.1 ports (4 ports at mid-board,
4 ports at the back panel)
LAN Realtek®PCIe Gb LAN
ASUS special features ASUS CrashFree BIOS 3
ASUS EZ Flash 2
ASUS MyLogo 2
Back panel I/O ports 1 x PS/2 Keyboard port
1 x PS/2 Mouse port
1 x RJ45 port
1 x VGA port
1 x COM port
1 x LPT port
4 x USB 2.0/1.1 ports
6-channel audio I/O ports
AT3GC-I specications summary
(continued on the next page)

ix
AT3GC-I specications summary
Internal I/O connectors 2 x USB 2.0/1.1 connectors support additional
4 USB 2.0/1.1 ports
1 x IDE connector
2 x SATA connectors
1 x System panel connector
1 x CD audio-in connector
1 x Internal speaker connector
1 x High Denition front panel audio connector
1 x Chassis fan connector
1 x Chassis intrusion connector
1 x 24-pin EATX power connector
1 x 4-pin ATX 12V power connector
1 x TPM connector (optional)
BIOS 8Mb Flash ROM, AMI BIOS, PnP, DMI2.0, WfM2.0,
SM BIOS 2.5, ACPI2.0a
Accessories 1 x Serial ATA cable
1 x UltraDMA 100/66 cable
1 x I/O shield
1 x User’s Manual
Support DVD Drivers
ASUS Update
ASUS PC Probe II
Anti-Virus software (OEM version)
User Manual
Form Factor MiniITX form factor: 6.75 in x6.75 in (17cm x 17cm)
*Specications are subject to change without notice.

Chapter 1
Product introduction
Thank you for buying an ASUS®AT3GC-I motherboard!
Before you start installing the motherboard, and hardware devices on it, check the items in
your motherboard package. Refer to page ix for the list of accessories.
If any of the items is damaged or missing, contact your retailer.
1.1 Before you proceed
Take note of the following precautions before you install motherboard components or change
any motherboard settings.
• Unplug the power cord from the wall socket before touching any component.
• Before handling components, use a grounded wrist strap or touch a safely grounded
object or a metal object, such as the power supply case, to avoid damaging them due to
static electricity
• Hold components by the edges to avoid touching the ICs on them.
• Whenever you uninstall any component, place it on a grounded antistatic pad or in the
bag that came with the component.
• Before you install or remove any component, switch off the ATX power supply and
detach its power cord. Failure to do so may cause severe damage to the motherboard,
peripherals, or components.
Onboard LED
This motherboard comes with a standby power LED that lights up to indicate that the system
is ON, in sleep mode, or in soft-off mode. This is a reminder that you must shut down
the system and unplug the power cable before removing or plugging in any motherboard
component. The illustration below shows the location of the onboard LED.
AT3GC-I
AT3GC-I Onboard LED
Chapter 1: Product introduction1-1

1.2 Motherboard overview
1.2.1 Motherboard layout
Place four screws into the holes indicated by circles to secure the motherboard to the
chassis. DO NOT overtighten the screws! Doing so can damage the motherboard.
Ensure that you install the motherboard into the chassis in the correct orientation. The edge
with external ports goes to the rear part of the chassis.
1.2.2 Layout contents
Connectors/Jumpers/Slots/LED Page Connectors/Jumpers/Slots/LED Page
1. Keyboard power (3-pin KBPWR) 1-6 9. Serial ATA connectors (7-pin SATA1, SATA2) 1-8
2. Chassis fan connectors (3-pin CHA_FAN) 1-10 10. Speaker connector (4- pin SPEAKER) 1-11
3. ATX power connectors (24-pin EATXPWR,
4-pin ATX12V)
1-11 11. Onboard LED 1-1
4. USB device wake-up (3-pin USBPW1-4,
USBPW5-8)
1-6 12. Front panel connector (10-1 F_PANEL) 1-12
5. Intel® Atom processor 330 and heatsink 1-3 13. USB connectors (10-1 pin USB56, USB78) 1-10
6. DDR2 DIMM socket 1-3 14. Chassis intrusion connector (4-1 pin
CHASSIS)
1-13
7. Clear RTC RAM (3-pin CLRTC) 1-5 15. Front panel audio connector (10-1 pin AAFP) 1-13
8. IDE connector (40-1 pin PRI_IDE) 1-9 16. Optical drive audio in connector (4-pin CD) 1-8
Place this side towards
the rear of the chassis.
AT3GC-I
PCI1
USB78
USB56
F_PANEL
AAFP
ATX12V
EATXPWR
CHA_FAN
Lithium Cell
CMOS Power
VIA
VT1705
RTL
8112
ICS
9LRS954
8Mb
BIOS
SB_PWR
CLRTC
USBPW1-4
USBPW5-8
KBPWR
CHASSIS
SPEAKER
17.1cm(6.75in)
17.1cm(6.75in)
Intel®
ICH7
Intel®
945GC
DDR2 DIMM1 (64bit, 240-pin module)
Intel®
Atom 330
SATA2
SATA1
AUDIO
LAN1_USB12
USB34
KBMS
Super
I/O
VGA
LPT
COM
CD
PRI_IDE
6
9
73 541 2
3
8
13154 1416 1012 11
1-2ASUS AT3GC-I

Visit the ASUS website at www.asus.com for the latest QVL.
1.3 Central Processing Unit (CPU)
The motherboard comes with an onboard Intel® Atom 330 processor and a specially designed
CPU heatsink.
1.4 System memory
1.4.1 Overview
The motherboard comes with one Double Data Rate 2 (DDR2) Dual Inline Memory Modules
(DIMM) sockets. The gure illustrates the location of the DDR2 DIMM socket:
AT3GC-I
AT3GC-I 240-pin DDR2 DIMM socket
DIMM1
1.4.2 Memory congurations
You may install a 256MB, 512MB, 1GB, and 2GB unbuffered non-ECC DDR2 DIMM into the
DIMM socket.
AT3GC-I Motherboard Qualied Vendors List (QVL)
DDR2-533MHz capability
SS: Single-sided / DS: Double-sided
DIMM support:
A*: Supports one module inserted into either slot as the single-channel memory
conguration.
Vendor Part No. Size SS/DD Brand Chip No.
DIMM
support
A*
Corsair VS 512MB533D2 512MB SS Corsair 64M8CEDGPS0900805 •
Corsair VS 512MB533D2 512MB DS Corsair MIII0052532M8CEC •
Corsair VS1GB533D2 1024MB DS Corsair 64M8CFEGQIB0900718 •
Elpida EBE51UD8ABFA-5C-E 512MB SS Elpida E5108AB-5C-E •
Kingmax KLBC28F-A8KB4 512MB SS Kingmax KKEA88B4IAK-37 •
Aeneon AET860UD00-370A08X 2048MB DS AENEON AET03F370AFVV26176G 0542 •
Elixir M2Y1G64TU8HBOB-37B 1024MB DS Elixir N2TU 51280BE-37B61921300CP •
REMAXEL RML1040EG38D6F-533 512MB SS Elpida E5108AG-5C-E •
TAKEMS TMS51B264C081-534AE 512MB SS takeMS MS18T 51280-3.7EA07100 •
TAKEMS TMS51B264C081-534AP 512MB SS takeMS MS18T 51280-3.7P0704D •
TAKEMS TMS51B264C081-534QI 512MB SS takeMS MS18T 51280-3.7 •
TAKEMS TMS1GB264C081-534AE 1024MB DS takeMS MS18T 51280-3.7EA0651D •
TAKEMS TMS1GB264C081-534AP 1024MB DS takeMS MS18T 51280-3.7P0645D •
TAKEMS TMS1GB264C081-534QI 1024MB DS takeMS MS18T 51280-3.7 •
Chapter 1: Product introduction1-3

1.5 Expansion slots
In the future, you may need to install expansion cards. The following sub-sections describe
the slots and the expansion cards that they support.
Unplug the power cord before adding or removing expansion cards. Failure to do so may
cause you physical injury and damage motherboard components.
1.5.1 Installing an expansion card
To install an expansion card:
1. Before installing the expansion card, read the documentation that comes with it and
make the necessary hardware settings for the card.
2. Remove the chassis cover (if your motherboard is already installed in a chassis).
3. Remove the bracket opposite the slot that you intend to use.
4. Align the card connector with the slot and press rmly until the card is completely
seated on the slot.
5. Secure the card to the chassis with the screw.
6. Replace the chassis cover.
When using PCI cards on shared slots, ensure that the drivers support “Share IRQ” or that
the cards do not need IRQ assignments; otherwise, conicts will arise between the two PCI
groups, making the system unstable and the card inoperable.
1.5.3 PCI slot
The PCI slots support cards such as LAN cards, SCSI cards, USB cards, and other cards
that comply with the PCI specications.
1.5.2 Conguring an expansion card
After installing the expansion card, congure it by adjusting the software settings.
1. Turn on the system and change the necessary BIOS settings, if any. See Chapter 2 for
information on BIOS setup.
2. Assign an IRQ to the card.
3. Install the software drivers for the expansion card.
1-4ASUS AT3GC-I

To erase the RTC RAM:
1. Turn OFF the computer and unplug the power cord.
2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3
for about 5-10 seconds, then move the cap back to pins 1-2.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot process and enter BIOS setup to reenter
data.
1.6 Jumpers
1. Clear RTC RAM (3-pin CLRTC)
This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can
clear the CMOS memory of date, time, and system setup parameters by erasing
the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in
CMOS, which include system setup information such as system passwords.
AT3GC-I
AT3GC-I Clear RTC RAM
1 2
2 3
Normal
(Default)
Clear RTC
CLRTC
Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default
position. Removing the cap will cause system boot failure!
• If the steps above do not help, remove the onboard battery and move the jumper again
to clear the CMOS RTC RAM data. After clearing the CMOS, reinstall the battery.
• You do not need to clear the RTC when the system hangs due to overclocking. For
system failure due to overclocking, use the CPU Parameter Recall (C.P.R.) feature. Shut
down and reboot the system, then the BIOS automatically resets parameter settings to
default values.
Chapter 1: Product introduction1-5

2. Keyboard power (3-pin KBPWR)
This jumper allows you to enable or disable the keyboard wake-up feature. When you
set this jumper to pins 2–3 (+5VSB), you can wake up the computer by pressing a key
on the keyboard (the default is the Space Bar)s. This feature requires an ATX power
supply that can supply at least 1A on the +5VSB lead, and a corresponding setting in
the BIOS.
AT3GC-I Keyboard Power Setting
AT3GC-I
21 2 3
+5V
(Default)
+5VSB
KBPWR
3. USB device wake-up (3-pin USBPW1-4, USBPW5-8)
Set these jumpers to +5V to wake up the computer from S1 sleep mode (CPU stopped,
DRAM refreshed, system running in low power mode) using the connected USB
devices. Set to +5VSB to wake up from S3 and S4 sleep modes (no power to CPU,
DRAM in slow refresh, power supply in reduced power mode).
AT3GC-I USB Device Wake Up
AT3GC-I
21 2 3
+5V
(Default)
+5VSB
USBPW5-8
21
2 3
+5V +5VSB
(Default)
USBPW1-4
1-6ASUS AT3GC-I

4. Line In port (light blue). This port connects to the tape, CD, DVD player, or other
audio sources.
5. Line Out port (lime). This port connects to a headphone or a speaker. In 4-channel
and 6-channel congurations, the function of this port becomes Front Speaker Out.
6. Microphone port (pink). This port connects to a microphone.
Refer to the audio conguration table below for the function of the audio ports in 2, 4, or
6-channel conguration.
Audio 2, 4, 6-channel conguration
Port Headset 2-channel 4-channel 6-channel
Light Blue Line In Rear Speaker Out Rear Speaker Out
Lime Line Out Front Speaker Out Front Speaker Out
Pink Mic In Mic In Bass/Center
1.7 Connectors
1.7.1 Rear panel ports
1. PS/2 Mouse port. This port is for a PS/2 mouse.
2. Parallel port. This 25-pin port connects a parallel printer, a scanner, or other devices.
3. LAN (RJ-45) port. This port allows Gigabit connection to a Local Area Network (LAN)
through a network hub. Refer to the table below for the LAN port LED indicators.
ACT/LINK LED SPEED LED
Status Description Status Description
OFF No link OFF 10 Mbps connection
ORANGE Linked ORANGE 100 Mbps connection
BLINKING Data activity GREEN 1 Gbps connection
4 53
68 7
2
10 9
1
11
LAN port LED indications
LAN port
SPEED
LED
ACT/LINK
LED
Chapter 1: Product introduction1-7

7. USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports connect to
USB 2.0/1.1 devices.
8. USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports connect to
USB 2.0/1.1 devices.
9. Video Graphics Adapter (VGA) port. This 15-pin port is for a VGA monitor or other
VGA-compatible devices.
10. COM port. This 9-pin COM1 port is for pointing devices or other serial devices.
11. PS/2 Keyboard port. This port is for a PS/2 keyboard.
1.7.2 Internal connectors
1. Serial ATA connectors (7-pin SATA1, SATA2)
These connectors are for the Serial ATA signal cables for Serial ATA 3Gb/s hard disk
and optical disk drives. The Serial ATA 3Gb/s is backward compatible with Serial ATA
1.5Gb/s specication. The data transfer rate of the Serial ATA 3Gb/s is faster than the
standard parallel ATA with 133MB/s (Ultra DMA133).
Install the Windows® XP Service Pack 2 or later version before using Serial ATA.
GND
RSATA_TXP1
RSATA_TXN1
GND
RSATA_RXP1
RSATA_RXN1
GND
SATA1
GND
RSATA_TXP2
RSATA_TXN2
GND
RSATA_RXP2
RSATA_RXN2
GND
SATA2
AT3GC-I
AT3GC-I SATA connectors
2. Optical drive audio in connector (4-pin CD)
This connector allows you to receive stereo audio input from sound sources such as a
CD-ROM, TV tuner, or MPEG card.
AT3GC-I Internal audio connector
AT3GC-I
CD
Left Audio Channel
GND
GND
Right Audio Channel
1-8ASUS AT3GC-I

3. IDE connector (40-1 pin PRI_IDE)
The onboard IDE connector is for an Ultra DMA 100/66 signal cable. There are three
connectors on each Ultra DMA 100/66 signal cable: blue, black, and gray. Connect the
blue connector to the motherboard’s IDE connector, then select one of the following
modes to congure your devices.
Drive jumper setting Mode of device(s) Cable connector
Single device Cable-Select or Master - Black
Two devices
Cable-Select Master Black
Slave Gray
Master Master Black or gray
Slave Slave
Pin 20 on the IDE connector is removed to match the covered hole on the Ultra DMA cable
connector. This prevents incorrect insertion when you connect the IDE cable.
• If any device jumper is set as “Cable-Select”, ensure that all other device jumpers have
the same setting.
• Use the 80-conductor IDE cable for Ultra DMA 100/66 IDE devices.
AT3GC-I IDE connector
AT3GC-I
PRI_IDE
NOTE:Orient the red markings
on the IDE ribbon cable to PIN 1.
PIN1
Chapter 1: Product introduction1-9

4. USB connectors (10-1 pin USB56, USB78)
These connectors are for USB 2.0 ports. Connect the USB module cable to any of
these connectors, then install the module to a slot opening at the back of the system
chassis. These USB connectors comply with the USB 2.0 specication that supports up
to 480Mbps connection speed.
Never connect a 1394 cable to the USB connectors. Doing so will damage the
motherboard!
The USB 2.0 module is purchased separately.
AT3GC-I
AT3GC-I USB2.0 connectors
PIN 1
USB+5V USB_P8- USB_P8+ GND NC
USB+5V
USB_P7-
USB_P7+
GND
USB78
PIN 1
USB+5V USB_P6- USB_P6+ GND NC
USB+5V
USB_P5-
USB_P5+
GND
USB56
5. Chassis fan connectors (3-pin CHA_FAN)
This fan connector supports cooling fans of 350mA~740mA (8.88W max.) at +12V.
Connect the fan cable to the fan connector on the motherboard, ensuring that the black
wire of the cable matches the ground pin of the connector.
DO NOT forget to connect the fan cable to the fan connector. Insufcient air ow inside
the system may damage the motherboard components. It is not a jumper! DO NOT place
jumper cap on the fan connector.
AT3GC-I
AT3GC-I fan connectors
CHA_FAN
GND
+12V
Rotation
1-10ASUS AT3GC-I

6. ATX power connectors (24-pin EATXPWR, 4-pin ATX12V)
These connectors are for an ATX power supply. The plugs from the power supply are
designed to t these connectors in only one orientation. Find the proper orientation and
push down rmly until the connectors completely t.
• We recommend that you use an ATX 12V Specication 2.0-compliant power supply unit
(PSU) with a minimum of 300W power rating. This PSU type has 24-pin and 4-pin power
plugs.
• If you intend to use a PSU with 20-pin and 4-pin power plugs, make sure that the 20-pin
power plug can provide at least 15 A on +12 V and that the PSU has a minimum power
rating of 300 W. The system may become unstable or may not boot up if the power is
inadequate.
• DO NOT forget to connect the 4-pin ATX +12 V power plug; otherwise, the system will
not boot up.
• We recommend that you use a PSU with higher power output when conguring a
system with more power-consuming devices or when you intend to install additional
devices. The system may become unstable or may not boot up if the power is
inadequate.
• If you are uncertain about the minimum power supply requirement for your system,
refer to the Recommended Power Supply Wattage Calculator at http://support.asus.
com/PowerSupplyCalculator/PSCalculator.aspx?SLanguage=en-us for details.
AT3GC-I
AT3GC-I ATX power connectors
EATXPWR
PIN 1
GND
+5 Volts
+5 Volts
+5 Volts
-5 Volts
GND
GND
GND
PSON#
GND
-12 Volts
+3 Volts
+3 Volts
+12 Volts
+12 Volts
+5V Standby
Power OK
GND
+5 Volts
GND
+5 Volts
GND
+3 Volts
+3 Volts
ATX12V
PIN 1
+12V DC +12V DC
GND GND
+5V GND GND Speaker Out
SPEAKER
PIN 1
AT3GC-I
AT3GC-I Speaker Out Connector
7. Speaker connector (4- pin SPEAKER)
This 4-pin connector is for the chassis-mounted system warning speaker. The speaker
allows you to hear system beeps and warnings.
Chapter 1: Product introduction1-11