* Specifications and information contained in this documentation are furnished for information use only, and ar e
subject to change at any time without notice, and should not be construed as a commitment by manufacturer.
Environmental Protection Announcement
Do not dispose this electronic device into the trash while discarding. To minimize pollution and
ensure environment protection of mother earth, please recycle.
z Avoid the dusty, humidity and temperature extremes. Do not place the product in
any area where it may become wet.
z 0 to 40 centigrade is the suitable temperature. (The figure comes from the request
of the main chipset)
z Generally speaking, dramatic changes in temperature may lead to contact
malfunction and crackles due to constant thermal expansion and contraction from
the welding spots’ that connect components and PCB. Computer should go
through an adaptive phase before it boots when it is moved from a cold
environment to a warmer one to avoid condensation phenomenon. These water
drops attached on PCB or the surface of the components can bring about
phenomena as minor as computer instability resulted from corrosion and oxidation
from components and PCB or as major as short circuit that can burn the
components. Suggest starting the computer until the temperature goes up.
z The increasing temperature of the capacitor may decrease the life of computer.
Using the close case may decrease the life of other device because the higher
temperature in the inner of the case.
z Attention to the heat sink when you over-clocking. The higher temperature may
decrease the life of the device and burned the capacitor.
iii
USER’S NOTICE
COPYRIGHT OF THIS MANUAL BELONGS TO THE MANUFACTURER. NO PART OF THIS
MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT MAY BE
REPRODUCED, TRANSMITTED OR TRANSLATED INTO ANY LANGUAGE IN ANY FORM OR
BY ANY MEANS WITHOUT WRITTEN PERMISSION OF THE MANUFACTURER.
THIS MANUAL CONTAINS ALL INFORMATION REQUIRED TO USE AMD 790GX
MOTHERBOARD AND WE DO ASSURE THIS MANUAL MEETS USER’S REQUIREMENT BUT
WILL CHANGE, CORRECT ANY TIME WITHOUT NOTICE. MANUFACTURER PROVIDES THIS
MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, AND WILL NOT BE LIABLE FOR ANY
INDIRECT, SPECIAL, INCIDENTIAL OR CONSEQUENTIAL DAMAGES (INCLUDING
DAMANGES FOR LOSS OF PROFIT, LOSS OF BUSINESS, LOSS OF USE OF DATA,
INTERRUPTION OF BUSINESS AND THE LIKE).
PRODUCTS AND CORPORATE NAMES APPEARING IN THIS MANUAL MAY OR MAY NOT BE
REGISTERED TRADEMARKS OR COPYRIGHTS OF THEIR RESPECTIVE COMPANIES, AND
THEY ARE USED ONLY FOR IDENTIFICATION OR EXPLANATION AND TO THE OWNER’S
BENEFIT, WITHOUT INTENT TO INFRINGE.
Manual Revision Information
Reversion Revision History Date
2.0 Second Edition April, 2010
Item Checklist
5
AMD790GX Platform Processor Chipset based motherboard
5
CD for Motherboard Utilities
5
User’s Manual
5
Switch Card
5
4 in 1 Cable Package (optional)
5
SATA Cable (optional)
5
I/O Back Panel Shield
AMD K10 Processor Family
Cooling Solutions
As processor technology pushes to faster speeds and higher performance with increasing operation
clock, thermal management becomes increasingly crucial while building computer systems. Maintaining
the proper computing environment without thermal increasing is the key to reliable, stable, and 24
hours system operation. The overall goal is keeping the processor below its specified maximum case
temperature. Heatsinks induce improved processor heat dissipation through increasing surface area
and concentrated airflow from attached active cooling fans. In addition, interface materials allow
effective transfers of heat from the processor to the heatsink. For optimum heat transfer, AMD
recommends the use of thermal grease and mounting clips to attach the heatsink to the processor.
Please refer to the website for collection of heatsinks evaluated and recommended for Socket AM2+
processors by AMD. In addition, this collection is not intended to be a comprehensive listing of all
heatsinks that support Socket-AM2+ processors.
iv
Chapter 1
Introduction of AMD790GX Motherboards
1-1 Features of motherboard
The AMD790GX chipset motherboard series are based on the latest AMD790GX Chipset and
the SB750 chipset which supports the innovative 64-bit AMD Socket AM3/AM2+AM2 dual
core and quad core AMD Phenom™ processors and 64-bit AMD Socket AM3/AM2+/AM2
multi-tasking Socket AM2 Athlon64 X2 processors and Sempron Processors. With an
integrated low-latency high-bandwidth DDRII and DDRIII memory controller and a
highly-scalable Hyper Transport technology-based system bus up to HT 3.0. AMD790GX
Platform Processor Chipset mo therb oard s eries deliver the outstanding system performance and
professional desktop platform solution with the advantages of new generation 64-bit AMD
Socket AM3/AM2+ / AM2 AMD Phenom™ FX, AMD Phenom™ Athlon64 FX , Athlon64
X2,Athlon64 & Sempron processors.
The AMD790GX Series motherboards come with two DDRII memory slots and two DDRIII
memory slots to support two DDRII533 /667 /800 (AM2 Sempron processors only support up
to DDRII667 memory) memory modules up to 4GB or two DDRIII 1066/ 1333 memory
modules up to 8GB. The board also supports dual-channel function. The AMD790GX Series
motherboards are embedded with SB750 chipset of providing 1 ULTRA ATA 133 connector
and Serial ATA2 with RAID 0, 1, 10, 5 functions which support up to two IDE hard disk
drive devices and six Serial ATA2 devices to accelerate hard disk drives and guarantee the
data security without failure in advanced com pu ting p e r f o r m ance.
The AMD790GX motherboards provide 10/100/1000 LAN function with Gigabit LAN which
supports 10/100/1000Mbps data transfer rate. And the embedded HD Audio CODEC is fully
compatible with Sound Blaster Pro standards that offer you with the home cinema quality and
satisfying software compatibility.
The AMD790GX Series motherboards deliver outstanding value and performance for gamers,
with a true bandwidth design for Multi-GPU configurations. This high bandwidth architecture
in the AMD 790GX chipset is with the flexibility for single or dual card or three cards
configurations. The AMD 790GX chipset provide 2 x16 by 8 lane PCI Express 2.0 slots to
support simultaneous operation of graphics cards for astonishing performance with brilliant
and intense 3D graphics.
AMD790GX Series motherboard series offer two PCI-Express2.0x16 graphics slots that
deliver up to 4Gbyte/sec data transfer rate at each relative direction. When PE4 installed
switch card, the PE1 will doubled its bandwidth. One PCI Express x1 I/O slot offers 512
Mbyte/sec concurrently, over 3.5 times more bandwidth than PCI at 133Mbye/sec, tackling
the most demanding multimedia tasks nowadays .The AMD790GX motherboards also carry
one 32-bit PCI slot guarantee the rich connectivity for the I/O peripheral devices. This
motherboard support Hybrid CrossFireX function, the VGA Card on PE1 or PE4 will activate
a Hybrid CrossFire with the onboard VGA Card when select sideport function in BIOS, the
performance will be increased 15% to 75%.
1
Embedded USB controllers as well as capability of expanding to 10 of USB2.0 functional
ports delivering 480Mb/s bandwidth of rich connectivity, these motherboards meet the future
USB demands which are also equipped with hardware monitor function on system to monitor
and protect your system and maintain your non-stop business computing.
Some special features---
OC-CON / G.P.I. Function
CPU Thermal Throttling/ CPU Vcore 7-shift / CPU Smart Fan /
etc. in this motherboard are designed for power user to use the
over-clocking function in more flexible ways. But please be caution that the over-clocking
maybe causes the fails in system reliabilities. This motherboard provides the guaranteed
performance and meets the demands of the next generation computing. But if you insist to
gain more system performance with variety possibilities of the components you choose,
please be careful and make sure to read the detailed descriptions of these value added
product features, please get them in the coming section.
1-1.1 Special Features of Motherboard
CPU Thermal Throttling Technology—The CPU Overheat Protection Technology
To prevent the increasing heat from damage of CPU or accidental shutdown while at high workload, the
CPU Thermal Throttling Technology will force CPU to enter partially idle mode from 87.5% to 12.5%
according to preset CPU operating temperature in BIOS (from 40℃ to 90℃). When the system senses the
CPU operating temperature reaching the preset value, the CPU operating bandwidth will be decreased to
the preset idle percentage to cool down the processor. When at throttling mode the beeper sound can be
optionally selected to indicate it is in working. (For detail operating please read Section 3-11 Bi-turbo
Configuration)
CPU Smart Fan—The Noise Management System
It’s never been a good idea to gain the performance of your system by sacrificing its acoustics. CPU Smart
Fan Noise Management System is the answer to control the noise level needed for now-a-day’s high
performance computing system. The system will automatically increase the fan speed when CPU operating
loading is high, after the CPU is in normal operating condition, the system will low down the fan speed for
the silent operating environment. The system can provide the much longer life cycle for both CPU and the
system fans for game use and business requirements.
CPU Vcore 7-Shift—Shift to Higher Performance
The CPU voltage can be adjusted up by 31 steps for the precisely over-clocking of extra demanding
computing performance.
OC-CON(optional)—High-polymer Solid Electrolysis Aluminum Capacitors
The working temperature is from 55 degrees Centigrade below zero to 125 degrees Centigrade, OC-CON
capacitors possess superior physical characteristics that can be while reducing the working temperature
between 20 degrees Centigrade each time, intact extension 10 times of effective product operation lives, at
not rising degrees Centigrade of working temperatures each time a relative one, life of product decline 10%
only too.
G.P.I Function(optional)—Green power indicator function)
G.P.I is a technology with remarkable power saving function: when you are using a computer with G.P.I
mode turned on, you save averagely 10.5w in power consumption in the whole process than normal
computer without G.P.I technology.
DIY Clear(optional)
The CMOS button is to facilitate the clear CMOS process for power user overclocking function. The user
can easily clear or restore CMOS setting by pressing the button without tacking trouble to remove the case
and locate the jumper for clear CMOS .
Power On Button(optional)
You can easily start the computer by pressing down this button for a few seconds, without troubling
yourself to locate the front panel jumpers to find the Power on jumper.
Reset Button(optional)
You can easily restart the computer by pressing down this button for a few seconds, without troubling
yourself to locate the front panel jumpers to find the reset jumper.
2
3D Audio((optional)
OP with two-stage Butterworth filter and quadruple noninverting amplifier enhances bass effect under the
100MHz range to perfect audio effect, brings you stunning shock experience in video game, true-to-life
simulated feeling when watching films and the greatest touch as that in the concert.
1-2 Specification
Spec Description
ATX form factor ; PCB size:24.5cm x24.5cm
Design
Chipset
CPU Socket
Memory Socket
GPU Memory
Expansion Slot
Integrate IDE and
Serial ATA2 RAID
Gigabit LAN
HD-Audio
BIOS
Multi I/O
z
AMD790GX North Bridge Chipset
z
AMD SB750 South Bridge Chipset
z
Support 64bit AMD Athlon64 940-Pin package utilizes Flip-Chip Pin
z
Grid Array package processor
Support for future AMD Athlon64 940-pin Dual –Core Athlon 64x2
z
processor, Athlon 64 & Sempron Processors with HTT Frequency 1GHz
and the latest AMD Phenom™ FX, quad core AMD Phenom™ processors
with HTT 3.0.
Ready for AM3 CPU
z
240-pin DDRII Module socket x 2
z
240-pin DDRIII Module socket x 2
z
Support 2pcs DDRII533/667/800 Modules Expandable to 4GB or 2pcs
z
DDRIII 1066/ 1333 Modules Expandable to 8GB
Dual channel supported
z
DDRIII 128Mb GPU Memory (optional)
z
2pcs PCI-Express x16 by 8 lane
z
1pcs PCI-Express x1 slot
z
32-bit PCI slot x 1pcs
z
One IDE controllers support PCI Bus Mastering, ATA PIO/DMA and the
z
ULTRA DMA 33/66/100/133 functions that deliver the data transfer rate
up to 133 MB/s for 2 IDE Devices and for 6 Serial ATA2 ports providing
300 MB/sec data transfer rate with RAID 0, 1, 10, 5 functions
Integrated PCI-E 10 / 100 / 1000 LAN.
z
Support Fast Ethernet LAN function of providing 10Mb/100Mb/1000
z
Mb/s data transfer rate
Realtek HD Audio Codec integrated
z
Support 3D surround & Positioning Audio
z
Audio driver and utility included
z
AMI 8MB SPI Flash ROM BIOS
z
PS/2 keyboard and PS/2 mouse connectors
z
Coaxial and optical SPDIF_OUT connector(optional)
z
HDMI Connector / DVI Connector / VGA Connector(HDMI Connector
z
and DVI Connector can not be used at the same time)
USB2.0 port x 4 and headers x 3
z
ESATA Connector x1
z
SATA Connector x6
z
RJ-45 Connector x1
z
Audio connector x1 (8CH Audio)
z
Hard Disk Drive Connector x1
z
Serial port header x1
z
HDMI-SPDIF header x1
z
IR header x1
z
3
1-3 Performance List
The following performance data list is the testing result of some popular benchmark testing
programs. These data are just referred by users, and there is no responsibility for different
testing data values gotten by users (the different Hardware & Software configuration will
result in different benchmark testing results.)
Performance Test Report
CPU: AMD PhenomⅡ 940
DRAM:
VGA Card:
Hard Disk Driver:
BIOS: T02
OS:
3D Mark 2003
3D Mark 2005
3D Mark 2006
AQUAMRK3
PCMark2005
System / CPU / Memory
Graph / HDD
Content Creation Winstone 2004
Business Winstone 2004
Winbench 99 V2.0:
Business /Hi-end Disk Winmark99
Serial ATAII Hard Disk Driver Connectors 7 -pin Connector
External Serial ATAII Connector 7-pin Connector
Coaxial/ Optical SPDIF Out Connector 1-phone connector
Headers
Header Name Description
AUDIO1 Front Panel SPEAKER, MIC header 9-pin Block
USB1, USB2, USB3 USB Port Headers 9-pin Block
SPEAK PC Speaker connector 4-pin Block
PWR LED Power LED 3-pin Block
JW_FP1
(Reset/IDE LED/Power Button)
SYSFAN1/2 System FAN Headers 3-pin Block
CPUFAN CPU FAN Header 4-pin Block
CDIN1 CD Audio-In Header 4-pin Block
IR IR infrared module Headers 5-pin Block
COM1 Serial Port COM1 Header 9-pin Block
HDMI-SPDIF SPDIF Out header 2-pin Block
Front Panel Header
(including IDE activity LED/Reset switch /
Power On Button lead)
9-pin Block
Expansion Sockets
Socket/Slot Name Description
ZIF Socket AM2 CPU Socket 940-pin PGAB Athlon64 CPU Socket
DDRIII1/DDRIII2 DDRIII Module Socket240-pin DDRIII Module Socket
DIMM1/ DIMM2 DDRII Module Socket 240-pin DDRII Module Socket
PCI1 PCI Slot 32-bit PCI Local Bus Expansion slot
PE2 PCI-Express x1Slot PCI-Express x1 Expansion Slot
Turn off your power when adding or removing expansion cards or other
system components. Failure to do so may cause severe damage to both
your motherboard and expansion cards.
2-1 Hardware installation Steps
Before using your computer, you had better complete the following steps:
1. Check motherboard jumper setting
2. Install CPU and Fan
3. Install System Memory (DIMM)
4. Install Expansion cards
5. Connect IDE and Front Panel /Back Panel cable
6. Connect ATX Power cable
7. Power-On and Load Standard Default
8. Reboot
9. Install Operating System
10. Install Driver and Utility
2-2 Checking Motherboard’s Jumper Setting
(1) Keyboard/USB function Enabled/Disabled: JP1
JP1
1-2 Closed KB/USB Power ON Disable (Default)
Keyb oard/M ouse & USB Power On Setting
JP1
2-3 Closed KB/USB Power ON Enabled
(2) CMOS RAM Clear (3-pin): JBAT
A battery must be used to retain the motherboard configuration in CMOS RAM short 1-2
pins of JBAT to store the CMOS data.
To clear the CMOS, follow the procedure below:
1. Turn off the system and unplug the AC power
2. Remove ATX power cable from ATX power connector
3. Locate JBAT and short pins 2-3 for a few seconds
4. Return JBAT to its normal setting by shorting pins 1-2
5. Connect ATX power cable back to ATX power connector
Note: When should clear CMOS
1. Troubleshooting
9
2. Forget password
3. After over clocking system boot fail
JBATJBAT
1-2 Closed Normal
CMOS RAM Clear Setting
2-3 Closed Clear CMOS
2-3 Install CPU
2-3-1 Glossary
Chipset (or core logic) - two or more integrated circuits which control the interfaces between
the system processor, RAM, I/O devises, and adapter cards.
Processor socket - the socket used to mount the system processor on the motherboard.
Slot (PCI-E, PCI, RAM) - the slots used to mount adapter cards and system RAM.
PCI - Peripheral Component Interconnect - a high speed interface for video cards, sound
cards, network interface cards, and modems; runs at 33MHz.
PCI Express2.0- Peripheral Component Interconnect Express2.0, developed in 2003, the
speed of each line doubled from the previous PCI-E of 2.5 Gbps to 5 Gbps.
Serial Port - a low speed interface typically used for mouse and external modems.
Parallel Port - a low speed interface typically used for printers.
PS/2 - a low speed interface used for mouse and keyboards.
USB - Universal Serial Bus - a medium speed interface typically used for mouse, keyboards,
scanners, and some digital cameras.
Sound (interface) - the interface between the sound card or integrated sound connectors and
speakers, MIC, game controllers, and MIDI sound devices.
LAN (interface) - Local Area Network - the interface to your local area network.
BIOS (Basic Input/Output System) - the program logic used to boot up a computer and
establish the relationship between the various components.
Driver - software, which defines the characteristics of a device for use by another device or
other software.
Processor - the "central processing unit" (CPU); the principal integrated circuit used for
doing the "computing" in "personal computer"
Front Side Bus Frequency -
by the clock generator for CPU, DRAM and PCI BUS.
CPU L2 Cache -
the flash memory inside the CPU, normal it depend on CPU type.
the working frequency of the motherboard, which is generated
10
2-3-2 About AMD Athlon64 Socket AM2+/AM3 CPU Socket
This motherboard provides a socket AM2+/AM3 surface mount, Zero Insertion Force (ZIF)
socket, referred to as the mPGA941 socket supports AM3/ AM2+ AMD processor utilizes
Flip-Chip Pin Grid Array package technology.
The CPU that comes with the motherboard should have a cooling FAN attached to prevent
overheating. If this is not the case, then purchase a correct cooling FAN before you turn on
your system.
WARNING!
Be sure that there is sufficient air circulation across the processor’s
heatsink and CPU cooling FAN is working correctly, otherwise it may
cause the processor and motherboard overheat and damage, you may install
an auxiliary cooling FAN, if necessary.
To install a CPU, first turn off your system and remove its cover. Locate the ZIF socket and
open it by first pulling the level sideways away from the socket then upward to a 90-degree
angle. Insert the CPU with the correct orientation as shown below. The notched corner should
point toward the end of the level. Because the CPU has a corner pin for two of the four
corners, the CPU will only fit in the orientation as shown.
Colden Arrow
Socket AM2+
CPU ZIF mPGAB Socket
When you put the CPU into the ZIF socket, No force required to insert of the CPU, and then
press the level to locate position slightly without any extra force.
2-4 Install Memory
This motherboard provides two 240-pin DDR II DUAL INLINE MEMORY MODULES
(DIMM) socket for DDR II memory SDRAM expansion available from minimum memory
volume of 128MB to maximum memory volume of 4 GB and two 240-pin DDR III SDRAM
DUAL INLINE MEMORY MODULES (DIMM) socket for DDR III memory expansion
available from minimum memory volume of 128MB to maximum memory volume of 8 GB.
Valid Memory Configurations for DDR II
Bank 240-Pin DIMM PCS Maximum Capacity
DIMM1 DDR II 667/DDR II 800 X1 2GB
DIMM2 DDR II 667/DDR II 800 X1 2GB
Total System Memory (Max 4GB) 2 4GB
11
1
Valid Memory Configuration for DDR III
Bank 240-Pin DIMM PCS Maximum Capacity
DDR III 1 DDRIII1066/DDRIII 1333 X1 4 GB
DDR III 2 DDRIII1066/DDRIII 1333 X1 4 GB
Total System Memory (Max. 8 GB) 2 8 GB
NOTICE!
1. If there is only one DDRII memory module, please install in DIMM1 slot; if tthere is only one
DDRIII memory module, please install in DDRIII1 slot.
2. Dual channel function only supports when 2 DDRIII memory modules plug in DIMM1
&DIMM2; or 2 DDRIII memory modules plug in DDR III 1 & DDR III .
3. Memory modules must be of the same type, same size, and same frequency for dual channel
function.
4. DIMM1and DIMM2 is for installing DDR II memory modules only while DDRIII1 and
DDRIII2 is for installing DDRIII memory modules only.
5. User can only install DDRII memory module(s) in DDR II memory module slot(s) when an
AM2 or AM2+ CPU is installed;
6. User can choose either installing DDRII memory module(s) in DDR II memory module slot(s)
or DDRIII memory module(s) in DDR III memory module slot(s), but NEVER both DDRII
and DDRIII memory module(s) at the same time under any circumstances.
Install DDR SDRAM modules to your motherboard is not difficult, you can refer to figure
below to see how to install a 240-Pin DDR II 667/DDR II 800 or a DDR III 1066 and DDR
III 1333SDRAM module.
DDRIII1 & DDRIII2: Dua l Channel
DIMM1 & DIMM2: Dual Chan ne l2
Graph 2-4
NOTICE!
WARNING!
When you install DIMM module fully into the DIMM socket the eject tab should be locked
into the DIMM module very firmly and fit into its indention on both sides.
This motherboard only supports DDR II 667/800 or higher frequency- compliant DDR II
Modules in DDRII memory slots and DDR III 1066 or higher frequency-compliant DDR
III Modules in DDRIII memory slots.
12
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