MS-5187

CPU Speed and Voltage Setting: SW1, JV1
To adjust the speed and voltage of the CPU, you must know the specification of your CPU (always ask the vendor for CPU specifications). Then refer to the following tables for proper setting.


1. The DIP switch SW1 (1,2 and 3) are 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.

SW1
CPU
1
2
3
Core/Bus Ratio
ON
OFF
OFF
2
ON
ON
OFF
2.5
OFF
ON
OFF
3
OFF
OFF
OFF
3.5
ON
OFF
ON
4
ON
ON
ON
4.5
OFF
ON
ON
5
OFF
OFF
ON
5.5


2. The DIP switch SW1 (5, 6, 7, and 8) are used to adjust the CPU clock freuqency or also referred as the FSB (Front Side Bus) speed.

SW1
CLOCK
5
6
7
8
CPU
OFF
OFF
OFF
ON
66MHz
ON
OFF
OFF
OFF
75MHz
OFF
ON
OFF
ON
83.3MHz
OFF
ON
ON
OFF
95MHz
OFF
ON
ON
ON
100MHz

3. Processor Voltage Setting
The jumper Switch JV 1(1-5) is used to set the processor Vcore voltage setting.

JV1
1
2
3
4
5
Vcore
OPEN
SHORT
OPEN
OPEN
OPEN
2.2
SHORT
SHORT
OPEN
OPEN
OPEN
2.3
OPEN
OPEN
SHORT
OPEN
OPEN
2.4
OPEN
OPEN
OPEN
SHORT
OPEN
2.8
SHORT
OPEN
OPEN
SHORT
OPEN
2.9
OPEN
OPEN
SHORT
SHORT
OPEN
3.2


4. Intel Processors: Intel Pentium processors with MMX Technology

CPU Type
CPU Speed & Voltage
VI/O
Vcore
JV1
SW1
166MHz
3.3
2.8

1 OPEN
2 OPEN
3 OPEN
4 SHORT
5 OPEN
1
2
3
4
5
6
7
8
ON
ON
OFF
ON
OFF
OFF
OFF
ON
200MHz
1
2
3
4
5
6
7
8
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
233Mhz
1
2
3
4
5
6
7
8
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
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5. Cyrix Processors: 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 has 120MHz core speed in Cyrix. Cyrix 6x86 processor should always use a more powerful fan (ask vendor for proper cooling fan).
Cyrix 6x86/6x86L Processors:
CPU Type
CPU Speed & Voltage
VI/O
 Vcore
JV1
SW1
6x86L PR166
3.3
2.8
1 OPEN
2 OPEN
3 OPEN
4 SHORT
5 OPEN
1
2
3
4
5
6
7
8
ON
OFF
OFF
ON
OFF
OFF
OFF
ON
6x86L PR200
1
2
3
4
5
6
7
8
ON
ON
OFF
ON
OFF
OFF
OFF
ON
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Cyrix 6x86MX Processor:
CPU Type
CPU Voltage
VI/O Vcore JV1
SW1
PR200 (66 x 2.5)
3.3
2.9
 1 SHORT
2 OPEN
3 OPEN
4 SHORT
5 OPEN
1
2
3
4
5
6
7
8
ON
ON
OFF
ON
OFF
OFF
OFF
ON
PR 233 (75 x 2.5)
1
2
3
4
5
6
7
8
ON
ON
OFF
ON
ON
OFF
OFF
OFF
PR 233 (66 x 3)
1
2
3
4
5
6
7
8
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
PR 233 (83 x 2)
1
2
3
4
5
6
7
8
ON
OFF
OFF
ON
OFF
ON
OFF
ON
PR 266 (75 x 3)
1
2
3
4
5
6
7
8
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
PR 266 (66 x 3.5)
1
2
3
4
5
6
7
8
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
PR 266 (83 x 2.5)
1
2
3
4
5
6
7
8
ON
ON
OFF
ON
OFF
ON
OFF
ON
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Cyrix MII Processor:
CPU Type
CPU Voltage
VI/O
Vcore
JV1
SW1
PR 300
(66 x 3.5)
3.3
2.9
1 SHORT
2 OPEN
3 OPEN
4 SHORT
5 OPEN
1
2
3
4
5
6
7
8
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
PR 300 (75 x 3)
1
2
3
4
5
6
7
8
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
PR 333 (83 x 3)
1
2
3
4
5
6
7
8
OFF
ON
OFF
ON
OFF
ON
OFF
ON
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7. AMD Processor
AMD K6/K6-2/K6-3 Processor
CPU Type
CPU Voltage
VI/O Vcore JV1
SW1
166MHz
3.3
2.9
 1 SHORT
2 OPEN
3 OPEN
4 SHORT
5 OPEN
1
2
3
4
5
6
7
8
ON
ON
OFF
ON
OFF
OFF
OFF
ON
200MHz
1
2
3
4
5
6
7
8
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
233MHz
3.3
3.2
 1 OPEN
2 OPEN
3 SHORT
4 SHORT
5 OPEN
1
2
3
4
5
6
7
8
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
266MHz
3.3
2.2
1 OPEN
2 SHORT
3 OPEN
4 OPEN
5 OPEN
1
2
3
4
5
6
7
8
ON
OFF
ON
ON
OFF
OFF
OFF
ON
300MHz
1
2
3
4
5
6
7
8
ON
ON
ON
ON
OFF
OFF
OFF
ON
K6-2 300MHz
1
2
3
4
5
6
7
8
OFF
ON
OFF
ON
OFF
ON
ON
ON
K6-2 333MHz
1
2
3
4
5
6
7
8
OFF
OFF
OFF
ON
OFF
ON
ON
OFF
K6-2 350MHz
1
2
3
4
5
6
7
8
OFF
OFF
OFF
ON
OFF
ON
ON
ON
K6-2 380MHz
1
2
3
4
5
6
7
8
ON
OFF
ON
ON
OFF
ON
ON
OFF
K6-2 400MHz
1
2
3
4
5
6
7
8
ON
OFF
ON
ON
OFF
ON
ON
ON
K6-2 450MHz
3.3
2.4
1 OPEN
2 OPEN
3 SHORT
4 OPEN
5 OPEN
1
2
3
4
5
6
7
8
ON
ON
ON
ON
OFF
ON
ON
ON
K6-III 400MHz
1
2
3
4
5
6
7
8
ON
OFF
ON
ON
OFF
ON
ON
ON
K6-III 450MHz
1
2
3
4
5
6
7
8
ON
ON
ON
ON
OFF
ON
ON
ON
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