MS-5170

CPU Speed and Voltage Setting: SW1 & JV0~JV3, JSD
To adjust the speed and voltage of the CPU, you must know the specifications of your CPU (always ask the vendor for CPU specifications). Then refer to the following tables for proper setting.

1.CPU Core Speed Derivation Procedure
The Switch SW1 (4&5) is used to adjusted the CPU clock frequency.

SW1
CPU
4
5
Clock
ON
ON
55MHz
ON
OFF
60MHz
OFF
OFF
66MHz

b: The Switch SW1 (1,2, & 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.

SW1
Intel
Cyrix
AMD
1
2
3
6x86
6x86MX
K5
K6
OFF
OFF
OFF
1.5
3
3.5
1.5
3.5
ON
OFF
OFF
2
2
2
2
OFF
ON
OFF
3
3
3
ON
ON
OFF
2.5
2.5
ON
OFF
ON
4

2. CPU Voltage Setting: JV0 ~ JV3

V I/O
Vcore
JV0-JV3
JV3
JV2
JV1
JV0
3.5
3.5
SHORT
SHORT
SHORT
SHORT
3.3
3.4
SHORT
SHORT
SHORT
OPEN
3.3
3.3
SHORT
SHORT
OPEN
SHORT
3.3
3.2
SHORT
SHORT
OPEN

OPEN

3.3
3.1
SHORT
OPEN
SHORT
SHORT
3.3
3.0
SHORT
OPEN
SHORT
OPEN
3.3
2.9
SHORT
OPEN
OPEN
SHORT
3.3
2.8
SHORT
OPEN
OPEN
OPEN
3.3
2.7
OPEN
SHORT
SHORT
SHORT
3.3
2.6
OPEN
SHORT
SHORT
OPEN
3.3
2.5
OPEN
SHORT
OPEN
SHORT
3.3
2.4
OPEN
SHORT
OPEN
OPEN
3.3
2.3
OPEN
OPEN
SHORT
SHORT
3.3
2.2
OPEN
OPEN
SHORT
OPEN
3.3
2.1
OPEN
OPEN
OPEN
SHORT
3.3
2.0
OPEN
OPEN
OPEN
OPEN
CPU Single or Dual Voltage Setting: JSD
This jumper is used to set the CPU single or dual voltage
JSD
CPU
S
Open
Dual Voltage CPU
D
Short
S
Short
Single Voltage CPU
D
Open

3. Intel Processors: Intel Processors
Intel Pentium Processor with MMX Technology
JV0-JV3:

CPU Type
CPU Voltage
CPU Speed
V I/O
Vcore
JSD
JV0-JV3
SW1
90MHz Short
Open
JV3
JV2
JV1
JV0
1
2
3
4
5
6
3.3
SHORT
SHORT
OPEN
SHORT
OPEN
OPEN
OPEN
SHORT
OPEN
OPEN
3.5
SHORT
SHORT
SHORT
SHORT
100MHz
3.3
SHORT
SHORT
OPEN
SHORT
OPEN
OPEN
OPEN
OPEN
OPEN
OPEN
120MHz
3.3
SHORT
OPEN
OPEN
SHORT
OPEN
OPEN
133MHz
3.5
SHORT
SHORT
SHORT
SHORT
SHORT
OPEN
OPEN
OPEN
OPEN
OPEN
150MHz
3.5
SHORT
SHORT
OPEN
SHORT
OPEN
OPEN
166MHz
3.5
SHORT
SHORT
OPEN
OPEN
OPEN
OPEN
200MHz
3.5
OPEN
SHORT
OPEN
OPEN
OPEN
OPEN
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Intel Pentium Processors with MMX technology
166MHz 3.3 2.8 Open
Short
SHORT OPEN OPEN OPEN SHORT SHORT OPEN OPEN OPEN OPEN
200MHz OPEN SHORT OPEN OPEN OPEN OPEN
233MHz OPEN OPEN OPEN OPEN OPEN OPEN

4. 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 Voltage
CPU Speed
V I/O
Vcore
JSD
JV0-JV3
SW1
JV3
JV2
JV1
JV0
1
2
3
4
5
6
6x86
PR133
3.3

Short
Open

SHORT
SHORT
OPEN
SHORT
SHORT
OPEN
OPEN
SHORT
SHORT
OPEN
6x86
PR150
3.5
SHORT
SHORT
SHORT
SHORT
SHORT OPEN OPEN SHORT OPEN OPEN
6x86
PR166
3.3
SHORT
SHORT
OPEN
SHORT
SHORT
OPEN
OPEN
OPEN
OPEN
OPEN
6x86l
PR166
3.3 2.8 Open
Short
SHORT OPEN OPEN OPEN

Cyrix 6x86MX Processors
PR166
(60x2.5)
2.9 Open
Short
SHORT OPEN OPEN SHORT SHORT SHORT OPEN SHORT OPEN OPEN
PR166 (66x2) SHORT OPEN OPEN OPEN OPEN OPEN
PR200 (66X2.5) SHORT SHORT OPEN OPEN OPEN OPEN
PR233
(66X3)
OPEN SHORT OPEN OPEN OPEN OPEN
PR266 (66x3.5) OPEN OPEN OPEN OPEN OPEN OPEN
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5. AMD Processor: AMD K5 processor uses PR to rate the speed of their processors based on Intel Pentium processor core speed. For example PR133 (100MHz) has 133 MHz core speed of Intel Pentium processor but has 100MHz core speed in AMD K5 processor.
AMD K5 Processors:
CPU Type
CPU Voltage
CPU Speed
V I/O
Vcore
JSD
JV0-JV3
SW1
JV3
JV2
JV1
JV0
1
2
3
4
5
6
PR90
3.5

Short
Open

SHORT
SHORT
SHORT
SHORT
OPEN OPEN OPEN
SHORT
OPEN
OPEN
PR100 OPEN OPEN OPEN OPEN OPEN
OPEN
PR120 SHORT OPEN OPEN SHORT OPEN
OPEN

PR133/
PR150

SHORT OPEN OPEN OPEN OPEN
OPEN
PR166 SHORT SHORT OPEN OPEN OPEN
OPEN
AMD K6 Processors:
PR166
3.3 2.9 Open
Short
SHORT OPEN OPEN SHORT SHORT SHORT OPEN OPEN OPEN OPEN
PR200 OPEN SHORT OPEN OPEN OPEN OPEN
PR233 3.3 3.2 SHORT SHORT OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN
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