Chapter 2
Hardware Installation
This chapter gives you a step-by-step procedure on how to install your system.
Follow each section accordingly.
Caution: Electrostatic discharge (ESD) can
damage your processor, disk drives, expansion
boards, and other components. Always observe
the following precautions before you install a
system component.
1. Do not remove a component from its
protective packaging until you are ready to
install it.
2. Wear a wrist ground strap and attach it to
a metal part of the system unit before
handling a component. If a wrist strap is
not available, maintain contact with the
system unit throughout any procedure
requiring ESD protection.
2-1
Hardware Installation
PWR 1
JP20
JP18
JP4
COM1
COM2
JP10
JP9
JP7
1
2.1 Jumper and Connector Locations
The following figure shows the locations of the jumpers and connectors on the
system board:
3
I
S
A
BIO
KBC
USB
I
I
S
S
A
A
1
2
S
RTC
FAN
PCI
4
PCI
3
PCI
2
PCI
1
PRINTER
JP3
PS2 MS
KB
D
S
I
M
M
4
FDC1
IDE1IDE2
S
S
S
I
M
M
3
I
I
I
M
M
M
M
M
M
1
1
2
HDD LED
JP8
JP11
JP12
IrDA
PANEL
2-2
Hardware Installation
Jumpers:
JP1,JP2: CPU frequency ratio select
JP3,JP4: CPU external (bus) clock select
JP7: CPU core voltage setting (Vcore)
JP8: I/O voltage setting (Vio)
JP9,JP10, JP11,JP12 CPU type
(Single/Dual voltage, Vcpuio) selection
JP14: For clearing CMOS
JP18: Enable/disable onboard super I/O controller
JP20: Enable/disable onboard PS/2 mouse
JP25: DIMM memory type select
Connectors:
KB1: AT keyboard connector
PWR1: AT (PS/2) power connector
PS2 MS: PS/2 mouse connector
USB: USB connector
COM1: COM1 connector
COM2: COM2 connector
FDC1: Floppy drive connector
PRINTER: Printer connector
IDE1: IDE1 primary channel
IDE2: IDE2 secondary channel
FAN: CPU fan connector
IrDA: IrDA (Infrared) connector
HDD LED: HDD LED connector
PANEL: Front-panel (Multifunction) connector
2-3
Hardware Installation
3
3
2.2 Jumper Settings
Board jumpers are made of pin headers and plastic connecting caps. These
are included in the mainboard design to enable you to customize your
hardware. The onboard jumpers are normally set to its default and optimum
setting. Be sure you have basic knowledge of computer hardware and
understand the function of the jumper before you change any setting.
Pin 1 of a jumper is indicated by a bold line on the mainboard. You may also
find number indications on the board to specify the proper configuration of the
jumper.
To set a jumper, simply connect the plastic cap to the required pins. For
example, to set a jumper to 1-2, place the plastic cap on pins 1-2 of the
jumper. An OPEN setting means that no plastic cap connected to the jumper
pins.
1
2
Open
Short
1
2
Jumper set at 1-2
1
2
Jumper set at 2-3
1
2
2-4
2.2.1 Setting the CPU Voltage
11
12
11
12
11
12
11
12
11
12
Hardware Installation
JP7
1-2
3-4
5-6
7-8
9-10
11-12
CPU Core Voltage (Vcore)
JP7 is used to select CPU core
voltage (Vcore), normally it is set
3.45V (Intel P54C or IDT C6)
3.52V (Cyrix or AMD K5)
2.9V (K6-166/200 or M2)
2.8V (MMX P55C)
3.2V (AMD K6-233)
2.1V (Reserved)
to default 3.45V for INTEL
Pentium P54C. It must be
changed if you have CPU with
different core voltage, such as
INTEL PP/MT MMX (P55C),
AMD K5/K6 and Cyrix 6x86,
refer to the CPU specification for
more details.
JP7
1
3
5
7
9
3.45V
P54C
IDT C6
10
JP7
1
2
3
4
5
6
7
8
9
10
3.52V
6x86 or
K5
JP7
1
2
4
6
8
2
3
4
5
6
7
8
9
10
2.9V
K6-166
1
3
5
7
9
2.8V
MMX P55C
K6-200
M2
Warning: The heat dissipation of Intel PP/MT-233Hz, AMD
K6-200/233MHz exceed the original design of this mainboard.
Please make sure that you have installed CPU fan properly if
Intel PP/MT-233 or AMD K6-200/233 is being selected to use.
It may cause your system unstable if you can not meet the
heat dissipation requirement from above CPU type. It is
recommended to adopt larger fan on these CPU for better air
flow in the system.
JP7
JP7
1
2
4
6
8
10
2
3
4
5
6
7
8
9
10
3.2V
K6-233
2-5
Hardware Installation
1 2
3 4
1 2
3 4
JP8
1-2
3-4
I/O Voltage (Vio)
3.45V (default)
3.52V
JP8 is reserved for testing purposes
only. This jumper enables you to set
the voltage of the onboard chipset and
PBSRAM (Vio). For dual-voltage CPU,
JP8 also functions as CPU I/O voltage
(Vcpuio) controller. The default voltage
setting is 3.45V.
JP8
3.45V
JP8
3.52V
(default)
2-6
Hardware Installation
2 4
1 3
2 4
1 3
2 4
1 3
2 4
1 3
2 4
1 3
2 4
1 3
2 4
1 3
2 4
1 3
JP9
1-2 &
3-4
Open
JP10
Open
1-2 &
3-4
JP11
1-2 &
3-4
Open
JP12
Open
1-2 &
3-4
CPU Type (Vcpuio)
Single Voltage CPU
Vcpuio = Vcore (default)
Dual Voltage CPU
Vcpuio = Vio (PP/MT P55C)
Set the jumpers JP9, JP10, JP11, and JP12 according to the type of CPU
currently supported. These jumpers are actually for selecting the CPU I/O
voltage (Vcpuio). Normally, for single-voltage CPU such as P54C, AMD K5
and Cyrix 6x86, Vcpuio is equal to Vcore. However, for CPU that needs dual
voltage such as PP/MT (P55C) and Cyrix 6x86L, Vcpuio is different from Vcore
and must be set to Vio.
JP11 &
JP12
JP9 &
JP10
JP11 JP9
JP12 JP10
Single voltage
(Vcpuio = Vcore)
JP11 JP9
JP12 JP10
Dual voltage
(Vcpuio = Vio)
2-7
Hardware Installation
CPU
Type
Intel
P54C
Intel
MMX
(P55C)
AMD K5
(Single
voltage)
AMD
K6166/200
AMD
K6-233
Cyrix
6x86
Cyrix
6x86L
Cyrix M2 2.9V 3.45V Vio 5-6 1-2 Open 1-2,
IDT C6 3.45V 3.45V Vcore 1-2 1-2 1-2,
Vcore Vio Vcpuio JP7 JP8 JP9 JP10 JP11 JP12
3.45V 3.45V Vcore 1-2 1-2 1-2,
2.8V 3.45V Vio 7-8 1-2 Open 1-2,
3.52V 3.45V Vcore 3-4 1-2 1-2,
2.9V 3.45V Vio 5-6 1-2 Open 1-2,
3.2V 3.45V Vio 9-10 1-2 Open 1-2,
3.52V 3.45V Vcore 3-4 1-2 1-2,
2.8V 3.45V Vio 7-8 1-2 Open 1-2,
Open 1-2,
3-4
3-4
Open 1-2,
3-4
3-4
3-4
Open 1-2,
3-4
3-4
3-4
Open 1-2,
3-4
Caution: The above table lists the possible settings only for
the current CPUs on the market. The settings may vary in
case there is a new CPU product introduced in the market.
See your CPU specifications for details.
Open
3-4
Open 1-2,
3-4
Open
3-4
Open 1-2,
3-4
Open 1-2,
3-4
Open
3-4
Open 1-2,
3-4
Open 1-2,
3-4
Open
3-4
2-8
Hardware Installation
2.2.2 Selecting the CPU Frequency
JP1
1-2
2-3
2-3
1-2
JP2
1-2
1-2
2-3
2-3
CPU Frequency
Ratio
1.5x (3.5x)
2x
2.5x (1.75x)
3x
The Intel Pentium, Cyrix 6x86 and
AMD K5/K6 CPUs have different
internal (Core) and external (Bus)
frequency. The ratio of Core/Bus
frequency that the CPU uses to
multiply the external clock and
produce internal frequency is selected
by setting JP1 and JP2.
Core frequency = Ratio x External
bus clock
JP1 & JP2
1 2 3
1.5x (3.5x)
JP1 & JP2
1 2 3
2.5x (1.75x)
JP1 & JP2
1 2 3
2x
JP1 & JP2
1 2 3
3x
Note: Intel PP/MT MMX 233MHz is using 1.5x
jumper setting for 3.5x frequency ratio, and AMD
PR166 is using 2.5x setting for 1.75x frequency
ratio.
JP3
2-3
1-2
2-3
JP4
2-3
2-3
1-2
CPU External Clock
50MHz
60MHz
66MHz
JP3 and JP4 let you set the CPU
external clock (bus clock), i.e., the
clock generator frequency.
2-9
Hardware Installation
JP3 & JP4
1 2 3
50MHz
JP3 & JP4
1 2 3
60MHz
JP3 & JP4
1 2 3
66MHz
Caution: The below table lists the possible
settings only for the current CPUs on the
market. The settings may vary in case there is
a new CPU product introduced in the market.
See your CPU specifications for details.
Intel Pentium CPU Core
Frequency
P54C 75 75MHz = 1.5x 50MHz 1-2 & 1-2 2-3 & 2-3
P54C 90 90MHz = 1.5x 60MHz 1-2 & 1-2 1-2 & 2-3
P54C 100 100MHz = 1.5x 66MHz 1-2 & 1-2 2-3 & 1-2
P54C 120 120MHz = 2x 60MHz 2-3 & 1-2 1-2 & 2-3
P54C 133 133MHz = 2x 66MHz 2-3 & 1-2 2-3 & 1-2
P54C 150 150MHz = 2.5x 60MHz 2-3 & 2-3 1-2 & 2-3
P54C 166 166MHz = 2.5x 66MHz 2-3 & 2-3 2-3 & 1-2
P54C 200 200MHz = 3x 66MHz 1-2 & 2-3 2-3 & 1-2
Ratio External Bus
Clock
JP1 & JP2 JP3 & JP4
Intel Pentium
P55C
PP/MT 150 150MHz = 2.5x 60MHz 2-3 & 2-3 1-2 & 2-3
PP/MT 166 166MHz = 2.5x 66MHz 2-3 & 2-3 2-3 & 1-2
PP/MT 200 200MHz = 3x 66MHz 1-2 & 2-3 2-3 & 1-2
PP/MT 233 233MHz = 3.5x 66MHz 1-2 & 1-2 2-3 & 1-2
IDT C6 CPU Core
WinChip 180 180MHz = 3x 60MHz 1-2 & 2-3 1-2 & 2-3
WinChip 200 200MHz = 3x 66MHz 1-2 & 2-3 2-3 & 1-2
CPU Core
Frequency
Frequency
Ratio External Bus
Clock
Ratio External Bus
Clock
JP1 & JP2 JP3 & JP4
JP1 & JP2 JP3 & JP4
2-10
Hardware Installation
Cyrix 6x86 CPU Core
Frequency
P120+ 100MHz = 2x 50MHz 2-3 & 1-2 2-3 & 2-3
P150+ 120MHz = 2x 60MHz 2-3 & 1-2 1-2 & 2-3
P166+ 133MHz = 2x 66MHz 2-3 & 1-2 2-3 & 1-2
Cyrix M2 CPU Core
Frequency
MX-PR166 150MHz = 2.5x 60MHz 2-3 & 2-3 1-2 & 2-3
MX-PR200 166MHz = 2.5x 66MHz 2-3 & 2-3 2-3 & 1-2
MX-PR233 200MHz = 3x 66MHz 1-2 & 2-3 2-3 & 1-2
MX-PR266 233MHz = 3.5x 66MHz 1-2 & 1-2 2-3 & 1-2
AMD K5 CPU Core
Frequency
PR90 90MHz = 1.5x 60MHz 1-2 & 1-2 1-2 & 2-3
PR100 100MHz = 1.5x 66MHz 1-2 & 1-2 2-3 & 1-2
PR120 90MHz = 1.5x 60MHz 1-2 & 1-2 1-2 & 2-3
PR133 100MHz = 1.5x 66MHz 1-2 & 1-2 2-3 & 1-2
PR166 116MHz = 1.75x 66MHz 2-3 & 2-3 2-3 & 1-2
AMD K6 CPU Core
Frequency
PR2-166 166MHz = 2.5x 66MHz 2-3 & 2-3 2-3 & 1-2
PR2-200 200MHz = 3x 66MHz 1-2 & 2-3 2-3 & 1-2
PR2-233 233MHz = 3.5x 66MHz 1-2 & 1-2 2-3 & 1-2
Ratio External
Bus Clock
Ratio External Bus
Clock
Ratio External
Bus Clock
Ratio External
Bus Clock
JP1 & JP2 JP3 & JP4
JP1 & JP2 JP3 & JP4
JP1 & JP2 JP3 & JP4
JP1 & JP2 JP3 & JP4
Notes: The Cyrix 6x86 and AMD K5 CPUs use
P-rating for the reference of CPU benchmark.
Unlike the Intel P54C, their internal core frequency
is not exactly equal to P-rating marked on the
CPU. For example, the AMD PR133 frequency is
100MHz, but its performance is almost equal to
Intel P54C 133MHz.
The Intel VX chipset does not support CPU with
55MHz and 75MHz external bus clock; thus, this
motherboard cannot support Cyrix P133+ and C6-
150.
2-11
Hardware Installation
3
3
2.2.3 Disabling the Onboard Super I/O Controller
JP18
1-2
2-3
Onboard Super I/O
Enabled (default)
Disabled
The board is default by the manufacturer
to enable the onboard Super I/O
controller. In case you wish to use an
external I/O controller, you need to
disable the onboard I/O before the
external I/O card functions. To disable,
set jumper JP18 to 2-3.
JP18
Enabled
1
2
JP18
Disabled
1
2
(default)
2-12
Hardware Installation
3
3
2.2.4 Disabling the PS/2 Mouse Function
JP20
1-2
2-3
PS/2 Mouse
Enabled (default)
Disabled
The PS/2 mouse function is normally
enabled and occupies IRQ12. To reassign
IRQ12 to another function, disable the PS/2
mouse function by setting jumper JP20 to
2-3.
JP20
Enabled
1
2
JP20
Disabled
1
2
(default)
2-13
Hardware Installation
2.2.5 Clearing the CMOS
JP14
1-2
Clear CMOS
Normal operation
(default)
2-3
Clear CMOS
Before you proceed, check your onboard CMOS
chip. The “clearing” procedures vary depending
on the CMOS chip type. Read the CMOS chip
label to determine the chip type.
For Dallas DS12887A:
You need to clear the CMOS if you forget
your system password. To clear the
CMOS, do the steps that follow the figure
below.
JP14
1
2
Normal Operation
JP14
1
2
Clear CMOS
(default)
1. Turn off the system power.
2. Locate JP14 and short pins 2-3 for a few seconds. Check your manual
for the correct jumper settings and location of the jumpers.
3. Reset JP14 to its normal setting by shorting pins 1-2.
4. Turn on the system power.
5. Press during bootup to enter the BIOS Setup Utility and specify a
new password, if needed.
2-14
Hardware Installation
1 2
3 4
1 2
3 4
For Dallas DS12B887, BENCHMARQ bq3287AMT, or SGS ST
M48T86 PCI chip:
1. Turn off the system power.
2. Locate JP14 and short pins 2-3 for a few seconds. Check your manual
for the correct jumper settings and location of the jumpers.
3. Turn on the system power.
4. Turn off the system power again.
5. Reset JP14 to its normal setting by shorting pins 1-2.
2.2.6 Selecting the DIMM Type
JP25
Open
1-2 & 3-4
Memory Type
SDRAM
EDO
JP25 lets you select your DIMM chip
type. The options are EDO or SDRAM.
JP25
SDRAM
JP25
EDO
2-15
Hardware Installation
2.3 Connectors
2.3.1 Power Cable
A standard baby AT (PS/2) power supply has two cables with six wires on each
cable. Plug in these cables to the onboard power connector in such a way that
all the black wires are in the center. The power connector is marked PWR1 on
the mainboard.
Caution: Make sure that the power supply is
OFF before connecting or disconnecting the
power cable.
Black wire (GND)
Red wire (+5V)
PWR1
2-16
Hardware Installation
3 1 2 4
5 6
2.3.2 CPU Fan
The fan connector is marked FAN on the system board. Plug in the fan cable
to this 2-pin connector onboard. Attach the heatsink and fan to the CPU.
Check its orientation, make sure the air flow go through the heatsink.
+12V
GND
FAN
2.3.3 PS/2 Mouse
Insert a PS/2 bracket connector to the connector
marked PS2 MS on the mainboard. Then plug
in the PS/2 mouse cable to the mouse port on
the bracket.
PS2 MS
Pin
1
2
3
4
5
6
Air Flow
Heatsink
Description
MS DATA
NC
GND
+5V
MS CLK
NC
2-17
Hardware Installation
1 2
9 10
1 2
9 10
2.3.4 Serial Devices (COM1/COM2)
Plug in the 10-pin flat cable to the appropriate onboard connectors. The
COM1 connector is marked COM1 and the COM2 connector is marked COM2
on the mainboard. Then insert the serial device connector into the serial port
on the bracket.
COM2
COM1
2-18
2.3.5 USB Device (optional)
Hardware Installation
You need a USB bracket to
enable your system to support
additional USB device(s). To
attach a USB bracket, simply
insert the bracket cable to the
onboard connector marked
USB.
Pin
1
3
5
7
9
1
9 10
USB
Description
V0
D0D0+
GND
NC
2
Pin
2
4
6
8
10
Description
V1
D1D1+
GND
NC
2-19
Hardware Installation
33
1
26
2
25
2.3.6 Floppy Drive
To support a floppy drive, connect the 34-pin floppy drive cable to the floppy
drive connector marked FDC1 on the mainboard.
1342
FDC1
2.3.7 Printer
This connector allows you to install a printer to your system. To install, plug in
the 26-pin printer flat cable to the onboard parallel connector marked
PRINTER.
2-20
PRINTER
Hardware Installation
1
40
2
39
1
40
2
39
2.3.8 IDE Hard Disk and CD ROM
This mainboard supports two 40-pin IDE connectors marked as IDE1 and
IDE2. The IDE1 is also known as primary channel and IDE2 as secondary
channel. Each channel supports two IDE devices.
In order to enable the devices to work together, the two devices on each
channel must be set differently to master and slave mode. The device can
either be a hard disk or a CD-ROM. The setting of master or slave depends on
your IDE device jumper. See to your hard disk and CD-ROM manual.
To attach the IDE devices, connect your first IDE hard disk to master mode of
the primary channel. If you have second IDE device to install in your system,
connect it as slave mode on the same channel. The third and fourth devices, if
any, can be connected on secondary channel at master and slave
respectively.
IDE2
IDE1
Caution: The maximum specification of the IDE
cable is 46cm (18 inches). Make sure that your
cable does not exceed this length.
For better signal quality, we recommend that you
set the device connected to the end of the cable
master mode. Follow the suggested sequence to
install your new device (see the following figure).
2-21
Hardware Installation
(1st)
(2nd)
IDE1 (Primary Channel)
Slave
IDE2 (Secondary Channel)
Slave
(4th)
Master
Master
(3rd)
2-22
2.3.9 Hard Disk LED
4
4
4
Hardware Installation
The HDD LED connector is marked HDD LED
on the board. This connector is designed to
support various types of housing. Actually,
only two pins are necessary for the LED. If
your housing comes with a 4-pin connector,
simply attach it to the onboard connector. For
a 2-pin connector, you can insert it to pins 1-2
or pins 3-4. However, when connecting, take
note of the polarity of the pins.
+
1
2
-
3
-
+
HDD LED
4-pin connector
Pin
1
2
3
4
+
1
2
-
3
-
+
HDD LED
2-pin connector
at pin 1-2
Description
HDD LED
GND
GND
HDD LED
+
-
-
+
HDD LED
2-pin connector
at pin 3-4
1
2
3
2-23
Hardware Installation
1
11
10
20
+
+
+
+++
10
20
2.3.10 Panel Connector
The multifunction (panel) connector is a
20-pin connector marked PANEL on the
board. Attach the power LED, keylock,
speaker, reset switch, suspend switch, and
green mode LED connectors to the
corresponding pins as shown in the figure.
Some housings come with a 5-pin connector
for the keylock and power LED. Since the
pins for power LED and keylock functions
remained aligned, you can attach it to the
onboard multifunction connector.
GND
KEYLOCK
GND
RESET
POWER LED
SPEAKER
+5V
GND
NC
SPEAKER
1
11
10 20
PANEL
+5V
GND
GREEN LED
GND
SUSPEND SW
SUSPEND SW
GND
NC
RESET
GND
Keylock
Power LED
Speaker
PANEL
Other housings may have a 12-pin
connector. If your housing has this
type of connector, connect it to
PANEL as shown in the figure. Make
sure that the red wire of the
connector is attached to +5V.
Green LED
Suspend SW
Reset
1
11
PANEL
+5V
2-24
Hardware Installation
Notes: If your housing comes with Turbo switch and
Turbo LED connectors, you may use these connectors
for Suspend switch and Green mode LED functions,
respectively.
Pressing the Suspend switch allows you to manually set
the system to suspend mode. However, this is possible
only if the Power Management function in the BIOS
Setup menu is enabled.
2-25
Hardware Installation
KB1
2.3.11 Keyboard
The onboard keyboard connector is a 5-pin AT-compatible connector marked
KB1. The figure below shows how the keyboard connector as viewed from the
back panel of the housing.
Note: The mini DIN PS/2 keyboard connector
is optional.
PCB
2-26
Hardware Installation
2.3.12 IrDA Connector
Serial port 2 can be configured to support wireless infrared module via this
connector and application software such as Laplink. This module enables the
user to transfer files to or from laptops, notebooks, PDA and printers without
using cables. This mainboard supports IrDA (115Kbps, 1 meter), as well as
ASK-IR (19.2Kbps).
To install an infrared module, insert the
module cable to IrDA connector then enable
infrared function by BIOS setup. Make sure of
the correct cable orientation when connecting
the cable to the IrDA connector.
1
2
3
4
5
6
IrDA
Pin
1
2
3
4
5
6
Description
+5V
NC
IRRX
GND
IRTX
+3.3V
2-27
Hardware Installation
Bank1
Bank0
DIMM
168
2.4 Configuring the System Memory
Pin 1 of
(Single-in-line Memory Module) and one 168 pin
DIMM socket (Dual-in-line Memory Module) that
This mainboard has four 72 pin SIMM sockets
Pin 1 of
Pin 1 of
allow you to install system memory from minimum
8MB up to maximum 128MB.
The SIMM supported by this mainboard can be identified by 4 kinds of factors,
Intel VX chipset does not support 64M bit technology.
♦ Size: single side, 1Mx32 (4MB), 4Mx32 (16MB), and double side, 1Mx32x2
(8MB), 4Mx32x2 (32MB).
♦ Speed: 60ns or 70ns access time
♦ Type: FPM (Fast page mode) or EDO (Extended data output)
♦ Parity: without parity (32 bit wide)
The DIMM supported by this motherboard are always 64-bit wide SDRAM,
which can be identified by following factors:
I. Size: single side, 1Mx64 (8MB), 2Mx64 (16MB), 4Mx64 (32MB), 8Mx64
(64MB), 16Mx64 (128MB), and double side, 1Mx64x2 (16MB), 2Mx64x2
(32MB), 4Mx64x2 (64MB), 8Mx64x2 (128MB).
Tip: Here is a trick to check if your DIMM is
single-side or double-side -- if there are traces
connected to golden finger pin 114 and pin 129 of
the DIMM, the DIMM is probably double-side;
otherwise, it is single-side. Following figure is for
your reference.
2-28
Pin 129
Pin 114
Hardware Installation
buffered
non-buffered
Reserved
II. Speed: normally marked as as -12, which means the clock cycle time is
12ns and maximum clock of this SDRAM is 83MHz. Sometimes you can
also find the SDRAM marked as -67, which means maximum clock is
67MHz.
III. Buffered and non-buffered: This motherboard supports non-buffered
DIMMs. You can identify non-buffered DIMMs and buffered DIMMs
according to the position of the notch, following figure is for your reference:
Because the positions are different, only non-buffered DIMMs can be
inserted into the DIMM sockets on this motherboard. Although most of
DIMMs on current market are non-buffered, we still recommand you to ask
your dealer for the correct type.
IV. 2-clock and 4-clock signals: Although both of 2-clock and 4-clock signals
are supported by AP5VM, we strongly recommand you to choose 4-clock
SDRAM in consideration of reliability.
Tip: To identify 2-clock and 4-clock SDRAM, you
may check if there are traces connected to
golden finger pin 79 and pin 163 of the SDRAM. If
there are traces, the SDRAM is probably 4-clock;
Otherewise, it is 2-clock.
V. Parity: This motherboard supports standard 64 bit wide (without parity)
SDRAM.
Because Pentium processor has 64 bit bus width, the four SIMM sockets are
arranged in two banks of two sockets each, they are Bank0 and Bank1. Both
SIMMs in each bank must be in the same size and type. It is allowed to have
different speed and type in different bank, for example, 70ns FPM in one bank
and 60ns EDO in another bank, in such case, each bank is independently
optimized for maximum performance. The memory timing requires at least
70ns fast page mode DRAM chip, but for optimum performance, 60ns EDO
DRAM is recommended.
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Hardware Installation
Warning: The default memory timing setting is 60ns to
obtain the optimal performance. Because of the
specification limitation, 70ns SIMM is recommended to
be used only for CPU external clock 60MHz.
Tip: EDO DRAM is designed to improve the DRAM read
performance. Unlike traditional fast page mode, that tristates the memory output data to start the precharge
activity, EDO DRAM holds the memory data valid until
the next memory access cycle, which is similar to pipeline effect and reduces one clock state.
There is no jumper setting required for the memory size or type. It is
automatically detected by the system BIOS. You can use any single side SIMM
and DIMM combination list below for BANK0/BANK1 or DIMM socket, and the
total memory size is to add them together. But because of chipset limitation,
the maximum is only 128MB.
SIMM1 SIMM2 Subtotal of
Bank0
None None 0MB None None 0MB
4MB 4MB 8MB 4MB 4MB 8MB
8MB 8MB 16MB 8MB 8MB 16MB
16MB 16MB 32MB 16MB 16MB 32MB
DIMM1 Size of DIMM Socket
None 0MB
8MB 8MB
16MB 16MB
32MB 32MB
SIMM3 SIMM4 Subtotal of
Total Memory Size = Subtotal of Bank0 + Subtotal of Bank1
+ Size of DIMM socket
Bank1
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Hardware Installation
For double side memory module, there is one limitation. This mainboard
supports only 4 RAS# (Row address latch) signals for DRAM control. They can
only be occupied by one DRAM module, they can not be shared. The simple
rule is: If double side module at either Bank1 or DIMM, the other must be
empty. Bank0 has no such limitation.
Double side module at either
Bank1 or DIMM socket, the
other must be empty.
Following table explains more about the RAS limitation. You can see that
Bank1 1st side and DIMM 2nd side use the same RAS2#, and Bank1 2nd side
and DIMM 1st side use the same RAS3#. If you are using single side SIMM at
Bank1 and single side DIMM, it should be no problem. But if you are using
double side DIMM or double side SIMM at Bank1, the other must be empty.
RAS0#
RAS1#
RAS2#
RAS3#
Bank0
1st side
Bank0
2nd side
Bank1
1st side
Bank1
2nd side
DIMM
1st side
DIMM
2nd side
X
X
X X
X X
Caution: Make sure that you install the same SIMM type
and size for each bank.
Caution: There are some old DIMMs made by EDO or
FPM memory chip, they can only accept 5V power and
probably can not fit into the DIMM socket, make sure
you have 3.3V true SDRAM DIMM before your insert it.
2-31
Hardware Installation
Warning: Do not use SIMM and SDRAM DIMM together
unless you have 5V tolerance SDRAM (such as
Samsung or TI). The FPM/EDO operate at 5V while
SDRAM operates at 3.3V. If you combine them together
the system will temporary work fine; however after a few
months, the SDRAM 3.3V data input will be damaged by
5V FPM/EDO data output line.
There is an important parameter affects SDRAM performance, CAS Latency
Time. It is similar as CAS Access Time of EDO DRAM and is calculated as
number of clock state. The SDRAM that AOpen had tested are listed below. If
your SDRAM has unstable problem, go into BIOS "Chipset Features Setup",
change CAS Latency Time to 3 clocks.
Manufacturer Model Suggested CAS
Latency Time
Samsung KM416511220AT-G12 2 Yes
NEC D4S16162G5-A12-7JF 2 No
Hitachi HM5216805TT10 2 No
TI TMX626812DGE-12 2 Yes
TI TMS626812DGE-15 3 Yes
TI TMS626162DGE-15 3 Yes
TI TMS626162DGE-M67 3 Yes
5V Tolerance
The driving capability of new generation chipset is limited because the lack of
memory buffer (to improve performance). This makes DRAM chip count an
important factor to be taking into consideration when you install SIMM/DIMM.
Unfortunately, there is no way that BIOS can identified the correct chip count,
you need to calculate the chip count by yourself. The simple rule is: By visual
inspection, use only SIMM with chip count less than 24 chips, and use only
DIMM which is less than 16 chips.
Warning: Do not install any SIMM that contains more
than 24 chips. SIMMs contain more than 24 chips
exceed the chipset driving specification. Doing so may
result in unstable system behavior.
Warning: Due to loading issue, it is not recommended to
use x4 (bit) SDRAM chip.
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Hardware Installation
Tip: The SIMM/DIMM chip count can be calculated by
following example:
1. For 32 bit non-parity SIMM using 1M by 4 bit DRAM
chip, 32/4=8 chips.
2. For 36 bit parity SIMM using 1M by 4 bit DRAM chip,
36/4=9 chips.
3. For 36 bit parity SIMM using 1M by 4 bit and 1M by
1 bit DRAM, the chip count will be 8 data chips(8=
32/4) plus 4 parity chips(4=4/1), total is 12 chips.
4. For 64 bit DIMM using 1M by 16 bit SDRAM, the chip
count is 64/16=4 chips.
Following table list the recommended DRAM combinations of SIMM and
DIMM:
SIMM
Data chip
1M by 4 None 1Mx32 x1 8 4MB Yes
1M by 4 None 1Mx32 x2 16 8MB Yes
1M by 4 1M by 1 1Mx36 x1 12 4MB Yes
1M by 4 1M by 4 1Mx36 x1 9 4MB Yes
1M by 4 1M by 4 1Mx36 x2 18 8MB Yes
1M by 16 None 1Mx32 x1 2 4MB Yes
1M by 16 None 1Mx32 x2 4 8MB Yes
1M by 16 1M by 4 1Mx36 x1 3 4MB Yes
1M by 16 1M by 4 1Mx36 x2 6 8MB Yes
4M by 4 None 4Mx32 x1 8 16MB Yes
4M by 4 None 4Mx32 x2 16 32MB Yes
4M by 4 4M by 1 4Mx36 x1 12 16MB Yes
4M by 4 4M by 1 4Mx36 x2 24 32MB Yes
SIMM
Parity chip
Bit size
per side
Single/
Double
side
Chip
count
SIMM
size
Recommended
2-33
Hardware Installation
DIMM
Data chip
1M by 16 1Mx64 x1 4 8MB Yes
1M by 16 1Mx64 x2 8 16MB Yes
2M by 8 2Mx64 x1 8 16MB Yes
2M by 8 2Mx64 x2 16 32MB Yes
Bit size per
side
Single/
Double side
Chip
count
DIMM size Recommended
Tip: 8 bit = 1 byte, 32 bit = 4 byte. The SIMM size is
represented by number of data byte (whether with or
without parity), for example, the size of single side SIMM
using 1M by 4 bit chip is 1Mx32 bit, that is, 1M x 4 byte =
4MB. For double side SIMM, simply multiply it by 2, that
is, 8MB.
Following table are possible DRAM combinations that is NOT recommended:
SIMM
Data chip
1M by 1 None 1Mx32 x1 32 4MB No
1M by 1 1M by 1 1Mx36 x1 36 4MB No
1M by 4 1M by 1 1Mx36 x2 24 8MB No
4M by 1 None 4Mx32 x1 32 16MB No
4M by 1 4M by 1 4Mx36 x1 36 16MB No
SIMM
Parity chip
Bit size
per side
Single/
Double
side
Chip
count
SIMM
size
Recommended
DIMM
Data chip
4M by 4 4Mx64 x1 16 32MB No
4M by 4 4Mx64 x2 32 64MB No
Bit size per
side
Single/
Double side
Chip
count
DIMM size Recommended
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