This publication, including all photographs, illustrations and software, is protected under
international copyright laws, with all rights reserved. Neither this manual, nor any of the
material contained herein, may be reproduced without written consent of the author.
Version 1.0b
Disclaimer
The information in this document is subject to change without notice. The manufacturer
makes no representations or warranties with respect to the contents hereof and specifically
disclaims any implied warranties of merchantability or fitness for any particular purpose.
The manufacturer reserves the right to revise this publication and to make changes from
time to time in the content hereof without obligation of the manufacturer to notify any
person of such revision or changes.
Trademark Recognition
Microsoft, MS-DOS and Windows are registered trademarks of Microsoft Corp.
nVIDIA is a registered trademark of nVIDIA Corporation
Other product names used in this manual are the properties of their respective owners and
are acknowledged.
Federal Communications Commission (FCC)
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 the 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 the receiver.
•Connect the equipment onto 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.
Shielded interconnect cables and a shielded AC power cable must be employed with this
equipment to ensure compliance with the pertinent RF emission limits governing this
device. Changes or modifications not expressly approved by the system’s manufacturer
could void the user’s authority to operate the equipment.
Preface
ii
Declaration of Conformity
This device complies with part 15 of the FCC rules. Operation is subject to the following
conditions:
•This device may not cause harmful interference, and
•This device must accept any interference received, including interference
that may cause undesired operation.
Canadian Department of Communications
This class B digital apparatus meets all requirements of the Canadian Interference-causing
Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Réglement sur le
matériel brouilieur du Canada.
About the Manual
The manual consists of the following:
Chapter 1
Introducing the Motherboard
Chapter 2
Installing the Motherboard
Chapter 3
Using BIOS
Chapter 4
Using the Motherboard Software
Describes features of the motherboard.
Go to
Describes installation of motherboard
components.
Go to
Provides information on using the BIOS
Setup Utility.
Thank you for choosing the NFORCE4-A939 motherboard. This motherboard is a high
performance, enhanced function motherboard that supports Socket 939 AMD Sempron/
Athlon 64/Athlon 64 FX/Athlon 64 X2 CPUs for high-end business or personal desktop
markets.
The NFORCE4-A939 motherboard is based on NVIDIA®CrushK8-04 (CK8-04) media and
communications processor (MCP) for best desktop platform solution. CrushK8-04 is a
single-chip, highly integrated, high performance HyperTransport peripheral controller,
unmatched by any other single chip-device controller. This motherboard supports up to
4GB of system memory with PC3200/2700/2100/1600 DDR DIMMs, high resolution graphics via an PCI Express x16 slot, Giga LAN, USB 2.0, 6-channel audio, and Digital S/PDIF out.
There is an advanced full set of I/O ports in the rear panel, including PS/2 mouse and
keyboard connectors, COM1, LPT1, four USB ports, one optional LAN port, one optional
coaxial SPDIF out, one optional optical SPDIF out and audio jacks for microphone, line-in,
and line-out. This motherboard is designed in an ATX form factor using a four-layer printed
circuit board and measures 305 mm x 244 mm.
1
Introducing the Motherboard
2
Feature
Processor
This motherboard uses a 939-pin socket that carries the following features:
•Supports up to 2000 MT/s HyperTransportTM (HT) interface Speeds
HyperTransportTM Technology is a point-to-point link between two devices, it enables
integrated circuits to exchange information at much higher speeds than currently available interconnect technologies.
Chipset
The NVIDIA® CrushK8-04 (CK8-04) is a single-chip with proven reliability and performance.
•HyperTransport x16 up and down links at up to 1.0 GHz to the AMD Sempron/
Athlon 64/Athlon 64 FX/Athlon 64 X2 processors
•PCI 2.3 interface, supporting up to five PCI slots
•Two separate SATA controllers with integrated PHYs, each supporting two
drives in master mode
•IEEE 802.3 NVIDIA MAC for 1000BASE-T/100BASE-T/10BASE-T
•USB 2.0 EHCI and USB 1.1 OHCI, supporting up to ten ports
•Fast ATA-133 IDE controller
•AC’97 2.3 interface, supporting S/PDIF pass-through function and standard,
enhanced audio functionality
•Supports Gigabit/Fast Ethernet/Ethernet
Memory
•Dual-channel DDR memory architecture
•4 x 184-pin, DDR SDRAM DIMM sockets support up to 4 GB
•Support DDR400/333/266/200 unbuffered DDR SDRAM
AC’97 Audio CODEC
•16-bit Stereo full-duplex CODEC with 48MHz sampling rate
•Compliant with AC’97 2.3 specifications
•Supports double sampling rate (96KHz) of DVD audio playback
Expansion Options
The motherboard comes with the following expansion options:
•One PCI Express x16 slot
•Two PCI Express x1 slots
•Three 32-bit PCI slots
•Two IDE headers which support four IDE devices
•One floppy disk drive interface
•Four 7-pin SATA connectors
This motherboard supports Ultra DMA bus mastering with transfer rates of 133/100/66
MB/s.
Introducing the Motherboard
Onboard LAN (optional)
The onboard LAN provides the following features:
•10/100/1000BASE-T IEEE 802.3 compliant
•Supports GMII, TBI, reduced pin count GMII (RGMII), reduced pin count TBI
(RTBI), and serial GMII (SGMII) interfaces
•IEEE 802.3u compliant Auto-Negotiation
•Prevents outgoing packets with spoofed IP source addresses and provides logging/configuration capabilities
Integrated I/O
The motherboard has a full set of I/O ports and connectors:
•Two PS/2 ports for mouse and keyboard
•One serial port
•One parallel port
•2 digital SPDIF (Optical & Coaxial) out (optional)
•Four USB ports
•One LAN port (optional)
•Audio jacks for microphone, line-in and line-out
BIOS Firmware
The motherboard uses Award BIOS that enables users to configure many system features
including the following:
•Power management
•Wake-up alarms
•CPU parameters
•CPU and memory timing
The firmware can also be used to set parameters for different processor clock speeds.
3
Some hardware specifications and software items are subject to change
without prior notice.
Introducing the Motherboard
4
Motherboard Components
Introducing the Motherboard
Table of Motherboard Components
LABEL COMPONENT
1 CPU SocketSocket 939 for AMD K8 processor
2 CPUFAN1CPU cooling fan connector
3 DIMM1~4184-pin DDR SDRAM slots
4 ATX1Standard 24-pin ATX power connector
5 IDE2Secondary IDE connector
6 IDE1Primary IDE connector
7 NBFAN1 Northbridge cooling fan connector
8 SATA1~SATA4 Serial ATA connectors
9 JP1 Clear CMOS jumper
10 PANEL1 Front Panel switch/LED header
11 USB3 ~ 5 Front Panel USB headers
12 FDD1 Floppy disk drive connector
13 SJ1 Single color LED header
14 CDIN1 Analog Audio Input connector
15 AUDIO1 Front panel audio header
16 IR1 Infrared header
This concludes Chapter 1. The next chapter explains how to install the motherboard.
Introducing the Motherboard
6
Memo
Introducing the Motherboard
Chapter 2
Installing the Motherboard
Safety Precautions
•Follow these safety precautions when installing the motherboard
•Wear a grounding strap attached to a grounded device to avoid damage from
static electricity
•Discharge static electricity by touching the metal case of a safely grounded
object before working on the motherboard
•Leave components in the static-proof bags they came in
•Hold all circuit boards by the edges. Do not bend circuit boards
Choosing a Computer Case
There are many types of computer cases on the market. The motherboard complies with
the specifications for the ATX system case. First, some features on the motherboard are
implemented by cabling connectors on the motherboard to indicators and switches on the
system case. Make sure that your case supports all the features required. Secondly, NFORCE4A939 supports one or two floppy diskette drives and four enhanced IDE drives. Make sure
that your case has sufficient power and space for all drives that you intend to install.
Most cases have a choice of I/O templates in the rear panel. Make sure that the I/O
template in the case matches the I/O ports installed on the rear edge of the motherboard.
This motherboard carries an ATX form factor of 305 X 244 mm. Choose a case that
accommodates this form factor.
7
Installing the Motherboard in a Case
Refer to the following illustration and instructions for installing the motherboard in a case.
Most system cases have mounting brackets installed in the case, which correspond the holes
in the motherboard. Place the motherboard over the mounting brackets and secure the
motherboard onto the mounting brackets with screws.
Ensure that your case has an I/O template that supports the I/O ports and expansion slots
on your motherboard.
Installing the Motherboard
8
Do not over-tighten the screws as this can stress the motherboard.
Checking Jumper Settings
This section explains how to set jumpers for correct configuration of the motherboard.
Setting Jumpers
Use the motherboard jumpers to set system configuration options. Jumpers with more than
one pin are numbered. When setting the jumpers, ensure that the jumper caps are placed on
the correct pins.
The illustrations show a 2-pin jumper. When
the jumper cap is placed on both pins, the
jumper is SHORT. If you remove the jumper
cap, or place the jumper cap on just one pin,
the jumper is OPEN.
This illustration shows a 3-pin jumper. Pins
1 and 2 are SHORT
SHORT OPEN
Installing the Motherboard
Checking Jumper Settings
The following illustration shows the location of the motherboard jumpers. Pin 1 is labeled.
9
Jumper Settings
Jumper
Type
3-pinCLEAR CMOS1-2: NORMAL
JP1
3-pin
JP3BIOS PROTECT
Description
Setting (default)
2-3: CLEAR
Before clearing the
CMOS, make sure to
turn the system off.
1-2: DISABLE
2-3: ENABLE
Installing the Motherboard
JP1
1
JP3
1
10
Connecting Case Components
After you have installed the motherboard into a case, you can begin connecting the motherboard components. Refer to the following:
1Connect the CPU cooling fan cable to CPUFAN1.
2Connect the case cooling fan connector to CASFAN1.
3Connect the Northbridge cooling fan connector to NBFAN1.
4Connect the case switches and indicator LEDs to the PANEL1, If there are 3
pins in the case LED cable, connect to SJ1.
5Connect the standard power supply connector to A TX1.
6Connect the auxiliary case power supply connector to ATX12V.
Connecting 20/24-pin power cable
Users please note that the 20-pin and 24-pin power cables can both be connected
to the ATX1 connector. With the 20-pin power cable, just align the 20-pin power
cable with the pin 1 of the ATX1 connector. However, using 20-pin power cable
may cause the system to become unbootable or unstable because of insufficient
electricity. A minimum power of 300W is recommended for a fully-configured
system.
With ATX v1.x power supply, users please note
that when installing 20-pin power cable, the
latche of power cable falls on the left side of
the ATX1 connector latch, just as the picture
shows.
20-pin power cable
With ATX v2.x power supply, users please note
that when installing 24-pin power cable, the
latches of power cable and the ATX1 match
perfectly.
24-pin power cable
Installing the Motherboard
CPUFAN1/CASF AN1/NBF AN1: FAN Power Connectors
Pin Signal Name Pin
1GNDSystem Ground
2+12VPower +12V
3SenseSensor
SJ1: Single-color LED header
Pin Signal Name
1ACPI LED
PinSignal Name
2ACPI LED
35VSB
ACPI LED function
S0 S1 S3 S4/S5
Light Blinking Blinking Dark
A TX1: A TX 24-pin Power Connector
Pin Signal Name Pin Signal Name
1+3.3V13+3.3V
2+3.3V14-12V
3Ground15COM
4+5V16PS_ON
5Ground17COM
6+5V18COM
7Ground19COM
8PWRGD20-5V
9+5VSB21 +5V
10+12V22+5V
11+12V23+5V
12+3.3V24COM
11
A TX12V: A TX 12V Power Connector
Pin Signal Name
1Ground
2Ground
3+12V
4+12V
Installing the Motherboard
12
Front Panel Header
The front panel header (PANEL1) provides a standard set of switch and LED headers
commonly found on ATX or Micro ATX cases. Refer to the table below for information:
Pin Signal Name FunctionPin Signal Name Function
1 HD_LED_P Hard disk LED+ 2 FP PWR/SLP *MSG LED+
3 HD_LED_N Hard disk LED-
5 RST_SW_N Reset Switch
7 RST_SW_P Reset Switch
9 RSVD Reserved
* MSG LED (dual color or single color)
Hard Drive Activity LED
Connecting pins 1 and 3 to a front panel mounted LED provides visual indication that data
is being read from or written to the hard drive. For the LED to function properly, an IDE
drive should be connected to the onboard IDE interface. The LED will also show activity
for devices connected to the SCSI (hard drive activity LED) connector.
Power/Sleep/Message waiting LED
4 FP PWR/SLP *MSG LED-
6 PWR_SW_P Power Switch
8 PWR_SW_N Power Switch
10 Key No pin
Connecting pins 2 and 4 to a single or dual-color, front panel mounted LED provides power
on/off, sleep, and message waiting indication.
Reset Switch
Supporting the reset function requires connecting pin 5 and 7 to a momentary-contact
switch that is normally open. When the switch is closed, the board resets and runs POST.
Power Switch
Supporting the power on/off function requires connecting pins 6 and 8 to a momentarycontact switch that is normally open. The switch should maintain contact for at least 50 ms
to signal the power supply to switch on or off. The time requirement is due to internal debounce circuitry. After receiving a power on/off signal, at least two seconds elapses before
the power supply recognizes another on/off signal.
Installing Hardware
Installing the Processor
Caution: When installing a CPU heatsink and cooling fan make sure that
you DO NOT scratch the motherboard or any of the surface-mount
resistors with the clip of the cooling fan. If the clip of the cooling fan
scrapes across the motherboard, you may cause serious damage to the
motherboard or its components.
Installing the Motherboard
On most motherboards, there are small surface-mount resistors near the
processor socket, which may be damaged if the cooling fan is carelessly
installed.
Avoid using cooling fans with sharp edges on the fan casing and the clips.
Also, install the cooling fan in a well-lit work area so that you can clearly
see the motherboard and processor socket.
Before installing the Processor
This motherboard automatically determines the CPU clock frequency and system bus
frequency for the processor. You may be able to change these settings by making changes
to jumpers on the motherboard, or changing the settings in the system Setup Utility. We
strongly recommend that you do not over-clock processors or other components to run
faster than their rated speed.
Warning: Over-clocking components can adversely affect the reliability of
the system and introduce errors into your system. Over-clocking can
permanently damage the motherboard by generating excess heat in
components that are run beyond the rated limits.
This motherboard has a Socket 939 processor socket. When choosing a processor, consider
the performance requirements of the system. Performance is based on the processor design,
the clock speed and system bus frequency of the processor, and the quantity of internal
cache memory and external cache memory.
13
CPU Installation Procedure
The following illustration shows CPU installation components.
1Install your CPU. Pull up the lever away from the
socket and lift up to 90-degree angle.
2Locate the CPU cut edge (the corner with the pin
hold noticeably missing). Align and insert the CPU
correctly.
3Press the lever down and apply thermal grease on
top of the CPU.
4Put the CPU Fan down on the retention module and
snap the four retention legs of the cooling fan into
place.
5Flip the levers over to lock the heat sink in place and
connect the CPU cooling Fan power cable to the
CPUFAN connector. This completes the installation.
To achieve better airflow rates and heat dissipation, we suggest that you use
a high quality fan with 4800 rpm at least. CPU fan and heatsink installation procedures may vary with the type of CPU fan/heatsink supplied. The
form and size of fan/heatsink may also vary.
Installing the Motherboard
14
Installing Memory Modules
This motherboard accommodates four 184-pin unbuffered DIMM and supports DDR400/
333/266/200 DDR SDRAM. You must install at least one module in any of the four slots.
Each module can be installed with 256 MB to 1 GB of memory; the total memory capacity
is 4 GB.
DDR SDRAM memory module table
Memory moduleMemory Bus
DDR200100MHz
DDR266133MHz
DDR333166MHz
DDR400200MHz
Do not remove any memory module from its antistatic packaging until you
are ready to install it on the motherboard. Handle the modules only by
their edges. Do not touch the components or metal parts. Always wear a
grounding strap when you handle the modules.
Installation Procedure
Refer to the following to install the memory modules.
1This motherboard supports unbuffered DDR SDRAM only.
2Push the latches on each side of the DIMM slot down.
3Align the memory module with the slot. The DIMM slots are keyed with
notches and the DIMMs are keyed with cutouts so that they can only be
installed correctly.
4Check that the cutouts on the DIMM module edge connector match the notches
in the DIMM slot.
5Install the DIMM module into the slot and press it firmly down until it seats
correctly. The slot latches are levered upwards and latch on to the edges of
Installing a Hard Disk Drive/CD-ROM/SA T A Hard Drive
This section describes how to install IDE devices such as a hard disk drive and a CD-ROM
drive.
About IDE Devices
Your motherboard has a primary and secondary IDE channel interface (IDE1 and IDE2).
An IDE ribbon cable supporting two IDE devices is bundled with the motherboard.
You must orient the cable connector so that the pin1 (color) edge of the
cable correspoinds to the pin 1 of the I/O port connector.
IDE1: Primary IDE Connector
The first hard drive should always be connected to IDE1.
IDE2: Secondary IDE Connector
The second drive on this controller must be set to slave mode. The cinfiguration is the same
as IDE1.
IDE devices enclose jumpers or switches used to set the IDE device as MASTER or SLAVE.
Refer to the IDE device user’s manual. Installing two IDE devices on one cable, ensure that
one device is set to MASTER and the other device is set to SLAVE. The documentation of
your IDE device explains how to do this.
About UltraDMA
This motherboard supports UltraDMA 133/100/66. UDMA is a technology that accelerates the performance of devices in the IDE channel. To maximize performance, install IDE
devices that support UDMA and use 80-pin IDE cables that support UDMA 133/100/66.
Installing the Motherboard
About SA TA Connectors
Your motherboard features two SATA connectors supporting a total of two drives. SATA
refers to Serial ATA (Advanced Technology Attachment) is the standard interface for the
IDE hard drives which are currently used in most PCs. These connectors are well designed
and will only fit in one orientation. Locate the SATA connectors on the motherboard and
follow the illustration below to install the SATA hard drives.
Installing Serial A TA Hard Drives
To install the Serial ATA (SATA) hard drives, use the SATA cable that supports the Serial
ATA protocol. This SATA cable comes with an SATA power cable. You can connect either
end of the SATA cable to the SATA hard drive or the connector on the motherboard.
17
SATA cable (optional)
Refer to the illustration below for proper installation:
1Attach either cable end to the connector on the motherboard.
2Attach the other cable end to the SATA hard drive.
3Attach the SATA power cable to the SATA hard drive and connect the other
end to the power supply.
This motherboard does not support the “Hot-Plug” function.
SATA power cable (optional)
Installing the Motherboard
18
Installing a Floppy Diskette Drive
The motherboard has a floppy diskette drive (FDD1) interface and ships with a diskette
drive ribbon cable that supports one or two floppy diskette drives. You can install a 5.25inch drive and a 3.5-inch drive with various capacities. The floppy diskette drive cable has
one type of connector for a 5.25-inch drive and another type of connector for a 3.5-inch
drive.
You must orient the cable connector so that the pin 1 (color) edge of the
cable corresponds to the pin 1 of the I/O port connector.
FDD1: Floppy Disk Connector
This connector supports the provided floppy drive ribbon cable. After connecting the single
end to the onboard floppy connector, connect the remaining plugs on the other end to the
floppy drives correspondingly.
Installing Add-on Cards
The slots on this motherboard are designed to hold expansion cards and connect them to the
system bus. Expansion slots are a means of adding or enhancing the motherboard’s features
and capabilities. With these efficient facilities, you can increase the motherboard’s capabilities by adding hardware that performs tasks that are not part of the basic system.
Installing the Motherboard
19
PCIE x1 Slots The two PCI Express x1 slots are fully compliant to the PCI Express
PCIE x16 Slot The PCI Express x16 slot is used to install an external PCI Express
PCI1~3 Slots
Follow these instructions to install an add-on card:
1Remove a blanking plate from the system case corresponding to the slot you
2Install the edge connector of the add-on card into the expansion slot. Ensure
3Secure the metal bracket of the card to the system case with a screw.
Base Specification revision 1.0a as well.
graphics card that is fully compliant to the PCI Express Base Specification revision 1.0a.
This motherboard is equipped with three standard PCI slots. PCI stands
for Peripheral Component Interconnect and is a bus standard for expansion cards, which for the most part, is a supplement of the older ISA bus
standard. The PCI slots on this board are PCI v2.3 compliant.
Before installing an add-on card, check the documentation for the card
carefully. If the card is not Plug and Play, you may have to manually
configure the card before installation.
are going to use.
that the edge connector is correctly seated in the slot.
For some add-on cards, for example graphics adapters and network adapters, you have to install drivers and software before you can begin using the
add-on card.
Installing the Motherboard
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