ATX AL9 User Manual
CHAPTER 2 HARDWARE INST ALLA TION
Chapter 2
HARDWARE INSTALLATION
2.1 Central Processing Unit: CPU
The A TX AL9 mainboard operates with Intel® Pentium® processor with
TM
MMX
processors. It could operate with 2.1V to 3.5V processors. The mainboard
provides a 321-pin ZIF Socket 7 for easy CPU installation, a jumper switch
(S1) to set the proper speed for the CPU and (S2) for setting the CPU
voltage. The CPU should always have a cooling fan attached to prevent
overheating.
2.1-1 CPU Installation Procedures
technology, Cyrix® 6x86L/6x86MX, and AMD® K6/K6-2/K6-III
1 . Pull the lever sideways away
from the socket. Then, raise
the lever up to a 90-degree
angle.
2 . Locate Pin 1 in the socket
and look for the white dot or
cut edge in the CPU. Match
Pin 1 with the white dot/cut
edge. Then, insert the CPU.
It should insert easily.
3. Press the lever down to
complete the installation.
2-1
Sliding
Plate
Open Lever
CPU
CPU
Close
Lever
Pin 1
White dot/
Cut edge
CHAPTER 2 HARDWARE INST ALLA TION
2.1-2 CPU Core Speed Derivation Procedure
1. The Jumper S1 (4, 5 & 6) is used to adjust the CPU clock frequency.
4 5 6
000100
0 0 1 75*
01083
0 1 1 66
10095
1 0 1 68
11075**
1 1 1 60
* AGP = 60/PCI =30
** AGP = 75/PCI = 37.5
CPU
Clock
0 = Open 1 = Short
2-2
CHAPTER 2 HARDWARE INST ALLA TION
2. The Jumper S1 (1, 2, and 3) is used to set the Core/Bus (Fraction) ratio of
the CPU. The actual core speed of the CPU is the Host Clock Frequency
multiplied by the Core/Bus ratio. For example:
If CPU Clock = 66MHz
Core/Bus ratio = 3/2
then CPU core speed = Host Clock x Core/Bus ratio
= 66MHz x 3/2
= 100MHz
1 2 3 CPU
0 0 0 1.5/3.5
0103x
1002x
1102.5x
0 0 1 5.5x
0 1 1 5x
1 0 1 4x
1 1 1 4.5x
Intel
AMD
Cyrix
IDT
AMD
K6/K6 2
0 = Open 1 = Short
2-3
CHAPTER 2 HARDWARE INST ALLA TION
2.1-3 CPU Voltage Setting: S2
5
1
S2
VcoreV I/O
3.45 3.5
3.45
3.45
3.45
3.4
3.3
3.2
S2
5
1
5
1
5
1
5
1
2-4
CHAPTER 2 HARDWARE INST ALLA TION
VcoreV I/O
3.45
3.45
3.45
3.45
3.1
3.0
2.9
2.8
3.45 2.7
3.45
3.45
2.6
2.5
S2
5
1
5
1
5
1
5
1
5
1
5
1
5
3.45
1
5
2.4
1
2-5
CHAPTER 2 HARDWARE INST ALLA TION
3.45
3.45
3.45
3.45
VcoreV I/O
S2
5
2.3
1
5
2.2
1
5
2.1
1
5
2.0
1
2-6
CHAPTER 2 HARDWARE INST ALLA TION
2.1-4 CPU Speed and Voltage Setting: S1 and S2
To set the proper speed and voltage of the CPU, you must know the specifications of your CPU (always ask the vendor for CPU specifications).
Then refer to Table 2.1 (Intel® Processor), Table 2.2 (Cyrix
Processor), Table 2.3 (AMD® Processor) and Table 2.4 (IDT C6TM) for
proper setting.
S2
S1
®
6
1
2-7
CHAPTER 2 HARDWARE INST ALLA TION
Table 2.1 Intel® Processor
Intel® Pentium® Processor with MMX
TM
T echnology
CPU
Type
VI/O
Vcore
CPU SpeedCPU Voltage
S1S2
166 MHz
6
6
200 MHz
3.45
2.8
5
1
1
1
233MHz
1
Note: If you encounter a CPU with different voltage, just go to Section
2.1-3 and look for the proper voltage settings.
6
2-8
CHAPTER 2 HARDWARE INST ALLA TION
Table 2.2 Cyrix® Processor
Cyrix® 6x86 processor uses PR to rate the speed of their processors based
on Intel® Pentium® processor core speed. For example, PR150 (120MHz)
has 150MHz core speed of Intel® Pentium® processor, but it has120MHz
core speed in Cyrix® processor. Cyrix® 6x86 processor should always use a
more powerful fan (ask vendor for proper cooling fan).
a. Cyrix® 6x86/6x86L processor
CPU
Type
6x86L
PR166
6x86L
PR200
VI/O Vcore
3.45
2.9
S2
CPU SpeedCPU Voltage
S1
5
1
1
1
6
6
2-9
CHAPTER 2 HARDWARE INST ALLA TION
b. Cyrix® 6x86MX Processor
CPU
Type
PR200
(66 x 2.5)
PR233
(75 x 2.5)
(66 x 3)
(83 x 2)
PR266
(75 x3)
(66 x 3.5)
(83 x 2.5)
c. Cyrix® MII Processor
VI/O
3.45
Vcore
2.9
CPU
Type
VI/O
Vcore
CPU Voltage
S2
5
1
CPU Voltage
S2
CPU Speed
S1
1
1
1
1
1
1
1
6
6
6
6
6
6
6
CPU Speed
S1
PR300
(66 x 3.5)
(75 x 3)
3.45
2.9
5
1
1
1
PR333
(83 x 3)
1
Note: If you encounter a CPU with different voltage, just go to Section
2.1-3 and look for the proper voltage settings.
2-10
6
6
6
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