MS-5169

1.CPU Core Speed Derivation Procedure
a: The Jumper S1 (4,5, & 6) is used to adjust the CPU clock frequency.
0 = Open, 1 = Short

SW1
CPU
4
5
6
Clock
0
0
0
100
0
0
1
75
0
1
0
83
0
1
1
66
1
0
0
95
1
0
1
68
1
1
0
75
1
1
1
60

b: The Jumper S1 (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.
0 = Open, 1 = Short

1
2
3
CPU
0
0
0
1.5/3.5
Intel
AMD
Cyrix
IDT
0
1
0
3x
1
0
0
2x
1
1
0
2.5x
0
0
1
5.5x
AMD
K6/K6 2
0
1
1
5x
1
0
1
4x
1
1
1
4.5x

2. CPU Voltage Setting: S2

V I/O
Vcore
S2
5
4
3
2
1
3.45
3.5
OFF
ON
ON
ON
ON
3.45
3.4
OFF
ON
ON
ON
OFF
3.45
3.3
OFF
ON
ON
OFF
ON
3.45
3.2
OFF
ON
ON
OFF
OFF
3.45
3.1
OFF
ON
OFF
ON
ON
3.45
3.0
OFF
ON
OFF
ON
OFF
3.45
2.9
OFF
ON
OFF
OFF
ON
3.45
2.8
OFF
ON
OFF
OFF
OFF
3.45
2.7
OFF
OFF
ON
ON
ON
3.45
2.6
OFF
OFF
ON
ON
OFF
3.45
2.5
OFF
OFF
ON
OFF
ON
3.45
2.4
OFF
OFF
ON
OFF
OFF
3.45
2.3
OFF
OFF
OFF
ON
ON
3.45
2.2
OFF
OFF
OFF
ON
OFF
3.45
2.1
OFF
OFF
OFF
OFF
ON
3.45
2.0
OFF
OFF
OFF
OFF
OFF

3. CPU Speed and Voltage Setting: S1 AND S2
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 table 4 (Intel Prossors), Table 5 (Cyrix Processors), and Table 6 (AMD Processors) for proper setting.


5. Intel Processors: Intel Processors
Intel Pentium Processor with MMX Technology

CPU Type
CPU Voltage & Speed
VI/O Vcore
S2
S1
166MHz 3.45
2.8
5
4
3
 2
1
off
on
off
 off
off
1
2
3
4
5
6
ON
ON
OFF
OFF
ON
ON
200MHz
1
2
3
4
5
6
OFF
ON
OFF
OFF
ON
ON
233MHz
1
2
3
4
5
6
OFF
OFF
OFF
OFF
ON
ON

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6. 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 and Speed
VI/O
Vcore
S2
S1
6x86l
PR166
3.45
2.9
1
2
3
4
5
off
on
off
 off
on
1
2
3
4
5
6
ON
OFF
OFF
OFF
ON
ON
6x86l
PR200
1
2
3
4
5
6
ON
ON
OFF
OFF
ON
ON

Cyrix 6x86MX Processor

CPU Type
CPU Speed & Voltage
VI/O
 Vcore
S2
S1
PR200 (66x2.5)
3.45
2.9
1
2
3
4
5
off
on
off
off
on
1
2
3
4
5
6
ON ON OFF OFF ON ON
PR233 (75 x 2.5)
1
2
3
4
5
6
ON ON OFF OFF OFF ON
PR233 (66x3)
1
2
3
4
5
6
OFF ON OFF OFF ON ON
PR233 (83x2)
1
2
3
4
5
6
ON OFF OFF OFF ON OFF
PR266 (75x3)
1
2
3
4
5
6
OFF ON OFF OFF OFF ON
PR266 (66x3.5)
1
2
3
4
5
6
OFF OFF OFF OFF ON ON
PR266
(83x2.5)
1
2
3
4
5
6
ON ON OFF OFF ON OFF
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Cyrix MII Processor:
PR300
(66x3.5)
3.45
2.9
1
2
3
 4
5
off
on
off
 off
on
1
2
3
4
5
6
OFF
OFF
OFF
OFF
ON
ON
PR300 (75x3)
1
2
3
4
5
6
OFF ON OFF OFF OFF ON
PR333 (83x3)
1
2
3
4
5
6
OFF
ON
OFF
OFF
ON
OFF

7. 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 K6/K6-2/K6-3 Processor
CPU Type
CPU Voltage
VI/O Vcore
S2
S1
166MHz
3.45
 2.9
1
2
3
4
5
off
on
off
 off
on
1
2
3
4
5
6
ON
ON
OFF
OFF
ON
ON
200MHz
1
2
3
4
5
6
OFF
O0
OFF
OFF
ON
ON
233MHz 3.45 3.2
1
2
3
4
5
off
on
off
 off
on
1
2
3
4
5
6
OFF
OFF
OFF
OFF
ON
ON
266MHz 3.45 2.2
1
2
3
4
5
off
off
off
 on
off
1
2
3
4
5
6
ON
OFF
ON
OFF
ON
ON
300MHz
1
2
3
4
5
6
ON
ON
ON
OFF
ON
ON
K6-2 300MHz
1
2
3
4
5
6
OFF
ON
OFF
OFF
OFF
OFF
K6-2
333MHz
1
2
3
4
5
6
OFF
OFF
OFF
ON
OFF
OFF
K6-2
350MHZ
1
2
3
4
5
6
OFF
OFF
OFF
OFF
OFF
OFF
K6-2
380MHz
1
2
3
4
5
6
ON
OFF
ON
ON
OFF
OFF
K6-2
400MHz
1
2
3
4
5
6
ON
OFF
ON
OFF
OFF
OFF
K6-2
450MHz 		   
1
2
3
4
5
off
off
on
 off
off
1
2
3
4
5
6
ON
ON
ON
OFF
OFF
OFF
K6-III
400MHz
1
2
3
4
5
6
ON
OFF
ON
OFF
OFF
OFF
K6-III
450MHz
1
2
3
4
5
6
ON
ON
ON
OFF
OFF
OFF

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