PCchips M925G Series User manual

This publication, including photographs, illustrations and software,
is under the protection of international copyright laws, with all
rights reserved. Neither this manual, nor any of the material
contained herein, may be reproduced without the express written
consent of the manufacturer.
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. Further, 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.
Trademarks
IBM, VGA, and PS/2 are registered trademarks of International
Business Machines.
Intel, Pentium, Pentium-II, Pentium-III, Pentium 4, MMX,
Celeron and Tualatin are registered trademarks of Intel
Corporation.
Microsoft, MS-DOS and Windows 98/ME/NT/2000/XP are
registered trademarks of Microsoft Corporation.
AMI is a trademark of American Megatrends Inc.
It has been acknowledged that all mentioned brands or product
names are trademarks or registered trademarks of their respective
holders.
Copyright © 2004
All Rights Reserved
M925G Series, V9.1B
P4M266A/March 2004

II
Table of Contents
Trademark.....................................................................................I
Static Electricity Precautions.................................................III
Pre-Installation Inspection.....................................................III
Chapter 1: Introduction................................................................1
Key Features............................................................................2
Package Contents ....................................................................6
Chapter 2: Motherboard Installation..........................................7
Motherboard Components.......................................................8
I/O Ports ..................................................................................8
Installing the Processor............................................................9
Installing Memory Modules..................................................10
Jumper Settings .....................................................................12
The Panel Connector .............................................................13
Other Devices Installation.....................................................14
Expansion Slots Installation..................................................14
Connecting Optional Devices ...............................................15
Chapter 3: BIOS Setup Utility ...................................................18
Introduction...........................................................................18
Running the Setup Utility...........…………………………...19
Standard CMOS Setup Page..................................................20
Advanced Setup Page............................................................21
Power Management Setup Page............................................24
PCI/Plug and Play Setup Page...............................................26
Load Optimal Settings...........................................................27
Load Best Performance Settings ...........................................27
Features Setup Page...............................................................27
CPU PnP Setup Page.............................................................29
Hardware Monitor Page ........................................................29
Change Password ..................................................................30
Exit ........................................................................................30
Chapter 4: Software & Applications .........................................31
Introduction...........................................................................31
Installing Support Software...................................................32
Bundled Software Installation...............................................34
Hyper-Threading CPU...........................................................35

III
Static Electricity Precautions
Static electricity could damage components on this motherboard.
Take the following precautions while unpacking this motherboard
and installing it in a system.
1. Don’t take this motherboard and components out of their
original static-proof package until you are ready to install
them.
2. While installing, please wear a grounded wrist strap if
possible. If you don’t have a wrist strap, discharge static
electricity by touching the bare metal of the system chassis.
3. Carefully hold this motherboard by its edges. Do not touch
those components unless it is absolutely necessary. Put this
motherboard on the top of static-protection package with
component side facing up while installing.
Pre-Installation Inspection
1. Inspect this motherboard whether there are any damages to
components and connectors on the board.
2. If you suspect this motherboard has been damaged, do not
connect power to the system. Contact your motherboard
vendor about those damages.

IV
Notice:
1. Owing to Microsoft’s certifying schedule is various to every
supplier, we might have some drivers not certified yet by
Microsoft. Therefore, it might happen under Windows XP that a
dialogue box (shown as below) pops out warning you this
software has not passed Windows Logo testing to verify its
compatibility with Windows XP. Please rest assured that our RD
department has already tested and verified these drivers. Just
click the “Continue Anyway” button and go ahead the
installation.
2. USB 2.0 Driver Limitations:
2-1 The USB 2.0 driver only supports Windows XP and
Windows 2000.
2-2 If you connect a USB 2.0 hub to the root hub, plugging USB
devices into this hub, the system might not successfully
execute certain USB devices’ connection because it could
not recognize these devices.
Currently, we are working on such limitations’ solution. As soon
as the solution is done, the updated USB drive will be released to
our website: www.pcchips.com for your downloading.

Chapter 1 Introduction
This motherboard has a Socket 478 for the Intel Pentium 4 /
Prescott type of processors supporting front side bus (FSB) speeds
up to 533/400 MHz.
This motherboard has the VIA P4M266A Northbridge and
VT8235 Southbridge chipsets that support AC’ 97 audio codec,
and provide Ultra DMA 133/100/66/33 function. It supports built-
in USB 2.0 providing higher bandwidth. It implements Universal
Serial Bus Specification Revision 2.0 and is compliant with
UHCI 1.1 and EHCI 0.95. This motherboard has three 32-bit PCI
slots, one 4xAGP slot, one CNR (Communications and
Networking Riser) slot, and an onboard 10BaseT/100BaseTX
Network interface (optional). In addition, this motherboard has a
full set of I/O ports including two PS/2 ports for mouse and
keyboard, one serial port, one VGA port, one parallel port and six
USB2.0 ports– four back-panel ports and onboard USB header
USB2 providing two extra ports by connecting the Extended USB
Module to the motherboard.
This motherboard is a Micro ATX size motherboard and has
power connectors for an ATX power supply.
Note: You must initiate the HT CPU function through
BIOS setup. It is strongly recommended you refer
to Page 35 for relative details.

2
Key Features
This motherboard has these key features:
Socket 478 Processor
The PGA Socket 478
Supports Intel Pentium 4 / Prescott series CPU
Supports a front-side bus (FSB) of 533/400 MHz
Chipset
There are VIA P4M266A Northbridge and VT8235 Southbridge in
this chipset in accordance with an innovative and scalable
architecture with proven reliability and performance. A few of the
chipset’s advanced features are:
An advanced V-Link memory controller architecture that
provides the bandwidth up to 266 MB/s and performance
necessary for even the most demanding Internet and 3D
graphics
Support for an 4xAGP interface providing vivid 3D
graphics and video performance
An ATA 133 interface on the chipset, which helps boost
system performance by providing a high-speed connection
to ATA 133 Hard Disk Drives, delivering maximum
sustained data transfer rates of 133 MB/sec
Additional key features include support for six USB ports, an AC
97 link for audio and modem, hardware monitoring, and
ACPI/OnNow power management.
Memory Support
The motherboard accommodates two 184-pin, 2.5V DDR
DIMM sockets with a total capacity of 2 GB system
memory.
Supports DDR 200/266MHz memory bus

3
Built-in Graphics System
P4M266A integrates S3ProSavage 8 graphics
accelerator into a single chip. P4M266A brings
mainstream graphics performance to the Value PC with
leading-edge 2D, 3D and DVD video acceleration into a
cost effective package. Based on its capabilities, P4M266A
is an ideal solution for the consumer, corporate mobile
users and entry level professionals.
Maximum shared memory size is 32 MB.
VGA
This motherboard includes a 4xAGP slot that provides four
times the bandwidth of the original AGP specification.
AGP technology provides a direct connection between the
graphics sub-system and memory so that the graphics do
not have to compete for processor time with other devices
on the PCI bus.
AC’97 Audio Codec
6- channel and compliant with IntelAC’97 (REV. 2.3) Spec,
meeting with MicrosoftPC2001 requirements
Advanced power management and power saving capabilities.
Stereo Line-in function shared with Surround out.
High quality pseudo-differential analog CD Audio input.
S/PDIF Output support: Output 96 / 48 kHz with 24 / 20 / 16
bits
Valuable add-on software technology: Support most industry
standards of PC 3D sound and unique karaoke function
support featured with microphone echo, key shifting, and
vocal cancellation.

4
Expansion Options
The motherboard comes with the following expansion options:
Three 32-bit PCI slots
One 4xAGP slot
One CNR (Communications and Networking Riser) slot
Onboard I/O Ports
The motherboard has a full set of I/O ports and connectors:
Two PS/2 ports for mouse and keyboard
One serial port
One VGA port
One parallel port
Six USB2.0 ports (four back-panel ports, onboard USB
connector providing two extra ports)
Audio jacks for microphone, line-in and line-out
BIOS Firmware
This motherboard uses AMI BIOS that enables users to configure
many system features including the following:
Power management
Wake-up alarms
CPU parameters and memory timing
CPU and memory timing
The firmware can also be used to set parameters for different
processor clock speeds.
Built-in Ethernet LAN (optional)
Built-in 10BaseT/100BaseTX Ethernet LAN
Embedded Fast Ethernet MAC and onboard Realtek
RTL8201BL LAN PHY compliant with IEEE802.3u
100BASE-TX, 10BASE-T and ANSI X3.263 TP-PMD
standards
Compliant with ACPI 1.0 and the Network Device Class
Power Management 1.0
High Performance provided by 100Mbps clock generator
and data recovery circuit for 100Mbps receiver

5
USB 2.0
Compliant with Universal Serial Bus Specification
Revision 2.0
Compliant with Intel’s Enhanced Host Controller
Interface Specification Revision 0.95
Compliant with Universal Host Controller Interface
Specification Revision 1.1
PCI multi-function device consists of two UHCI Host
Controller cores for full-/low-speed signaling and one
EHCI Host Controller core for high-speed signaling
Root hub consists 4 downstream facing ports with
integrated physical layer transceivers shared by UHCI and
EHCI Host Controller
Support PCI-Bus Power Management Interface
Specification release 1.1
Legacy support for all downstream facing ports
Bundled Software
Adobe Acrobat Reader is the software to help users read
PDF files.
Dimensions
Micro ATX form factor of 244 x 200 mm
Note: Hardware specifications and software items
are subject to change without notification.

6
Package Contents
Your motherboard package contains the following items:
The motherboard
The User’s Manual
One diskette drive ribbon cable (optional)
One IDE drive ribbon cable
The Software support CD
Optional Accessories
You can purchase the following optional accessories for this
motherboard.
Extended USB module
CNR v.90 56K Fax/Modem card
Card Reader (You can buy your own Card Reader from the
third party, but please contact your local Card Reader vendor
on any issues of the specification and compatibility.)

Chapter 2
Motherboard Installation
To install this motherboard in a system, please follow these
instructions in this chapter:
Identify the motherboard components
Install a CPU
Install one or more system memory modules
Make sure all jumpers and switches are set correctly
Install this motherboard in a system chassis (case)
Connect any extension brackets or cables to connectors on the
motherboard
Install peripheral devices and make the appropriate
connections to connectors on the motherboard
Note:
1. Before installing this motherboard, make sure jumper JBAT1
is under Normal setting. See this chapter for information
about locating JBAT1 and the setting options.
2. Never connect power to the system during installation;
otherwise, it may damage the motherboard.

8
Motherboard Components
Identify major components on the motherboard via this diagram
underneath.
I/O Ports
The illustration below shows a side view of the built-in I/O ports
on the motherboard.
(o
p
tional)
(shared
with
JUSBC
)

9
PS/2 Mouse Use the upper PS/2 port to connect a PS/2
pointing device.
PS/2 Keyboard Use the lower PS/2 port to connect a PS/2
keyboard.
LPT1 Use LPT1 to connect printers or other
parallel communications devices.
COM1 Use the COM port to connect serial devices
such as mice or fax/modems. COM1 is
identified by the system as COM1.
VGA Use the VGA port to connect VGA devices.
LAN Port
(optional) Connect an RJ-45 jack to the LAN port to
connect your computer to the Network.
USB Ports Use the USB ports to connect USB devices.
Note: The lower USB port located beside the
VGA port is shared with the JUSBC connector.
Audio Ports Use the three audio ports to connect audio
devices. The first jack is for stereo Line-In
signal. The second jack is for stereo Line-
Out signal. The third jack is for
Microphone.
Installing the Processor
This motherboard has a Socket 478 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.

10
CPU Installation Procedure
Follow these instructions to install the CPU:
CPU_FAN
1. Unhook the locking lever of the CPU socket. Pull
the locking lever away from the socket and raising
it to the upright position.
2. Match the pin1 corner marked as the beveled edge
on the CPU with the pin1 corner on the socket.
Insert the CPU into the socket. Do not use force.
3. Push the locking lever down and hook it under the
latch on the edge of socket.
4. Apply thermal grease to the top of the CPU.
5. Install the cooling fan/heatsink unit onto the CPU,
and secure them all onto the socket base.
6. Plug the CPU fan power cable into the CPU fan
connector (CPU_FAN) on the motherboard.
Installing Memory Modules
This motherboard accommodates two 184-pin 2.5V unbuffered
Double Data Rate SDRAM (DDR SDRAM) Dual Inline
Memory Module (DIMM) sockets, and supports up to 2.0 GB
of 200/266 MHz DDR SDRAM.
DDR SDRAM is a type of SDRAM that supports data transfers on
both edges of each clock cycle (the rising and falling edges),
effectively doubling the memory chip’s data throughput. DDR
DIMMs can synchronously work with 200 MHz or 266 MHz
memory bus.
1
Socket-478
Pin1

11
DDR SDRAM provides 1.6 GB/s or 2.1 GB/s data transfer rate
depending on whether the bus is 100 MHz or 133 MHz.
DDR SDRAM uses additional power and ground lines and requires
184-pin 2.5V unbuffered DIMM module.
Installation Procedure
These modules can be installed with up to 2 GB system memory.
Refer to the following to install the memory module.
1. Push down the latches on both sides of the DIMM
socket.
2. Align the memory module with the socket. There is
a notch on the DIMM socket that you can install the
DIMM module in the correct direction. Match the
cutout on the DIMM module with the notch on the
DIMM socket.
3. Install the DIMM module into the socket and press
it firmly down until it is seated correctly. The
socket latches are levered upwards and latch on to
the edges of the DIMM.
4. Install any remaining DIMM modules.
DDR2
DDR1

12
JP1
Jumper Settings
JBAT1: Clear CMOS Jumper
This jumper is to clear the contents of CMOS memory. You may
need to clear the CMOS memory if the settings in the Setup Utility
are incorrect that prevents your motherboard from operating. To
clear the CMOS memory, disconnect all the power cables from the
motherboard and then move the jumper cap into the CLEAR
setting for a few seconds.
Function Jumper Setting
Normal Short Pins 1-2
Clear CMOS Short Pins 2-3
JP1A1, JP1B1: CPU Clock
This jumper enables to select CPU frequency.
CPU Clock JP1A1 JP1B1
100M Short Pins 1-2 Short Pins 2-3
133M Short Pins 2-3 Short Pins 1-2
JP1: Keyboard Power On
This jumper enables any keyboard activity to power up a
system previously in a standby or sleep state.
Function Jumper Setting
5V Short Pins 1-2
5VSB Short Pins 2-3
1
JBAT1
1
1
AUDIO1
1
PANEL1
1 1
JP1A1 JP1B1

13
The Panel Connector
Audio 1
If there are a headphone jack or/and a microphone jack on the front
panel, connect the cables to the PANEL1 on the motherboard.
Device Pins
Line Out (L) 9, 10
Empty 8
NC 7
Line Out (R) 5, 6
+5V Audio 4
VCCMIC 3
MIC-IN 1,2
MIC-IN
(Pin 1)
2 1
Line Out(R)
(Pin 5)
10 9
Line Out(L)
(Pin 9)
MIN-IN
(Pin 2)
VCC MIC
(Pin 3)
+5V Audio
(Pin 4)
Line Out(R)
(Pin 6)
NC (Pin 7)
Empty
(Pin 8)
Line Out(L)
(Pin 10)
PANEL 1
This panel connector provides a set of switch and LED connectors
found on ATX case. Refer to the table below for information.
Device Pins
Empty 10
N/C 9
Power
ON/OFF 6, 8
Reset Switch 5, 7
SPD-LED
Indicator +2, 4
HDD LED +1, -3
HDD LED
(Pins 1, 3)
2 1
Reset Switc
h
(Pins 5, 7)
Power Switch
(Pins 6, 8)
SPD-LED
(Pins 2, 4)
Empty
(Pin 10)
10 9
N/C
(Pin 9)
++

14
Other Devices Installation
Floppy Diskette Drive Installation
The motherboard has a floppy diskette drive (FDD) interface and
ships with a diskette drive ribbon cable that supports one or two
floppy diskette drives. You can install a 5.25-inch 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.
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.
If you want to install more than two IDE devices, get a second IDE
cable and you can add two more devices to the secondary IDE
channel.
IDE devices have jumpers or switches to set the IDE device as
MASTER or SLAVE. When installing two IDE devices on one
cable, ensure that one device is set to MASTER and the other one
to SLAVE.
This motherboard supports Ultra DMA 66/100/133. UDMA is a
technology to accelerate devices’ performance in the IDE channel.
To maximize performance, install IDE devices that support UDMA
and use 80-pin IDE cables supporting UDMA 66/100/133.
Expansion Slots Installation
This motherboard has one 4xAGP, one CNR and three 32-bit PCI
(Peripheral Components Interconnect) expansion slots.
4 x AGP (Accelerated Graphics Port) Slot
You can install a graphics adapter supporting 4xAGP specification
in the AGP slot. This slot has one 4xAGP edge connector.
CNR (Communications Networking Riser) Slot
You can install a CNR (the Communications Networking Riser)
card in the CNR slot.