|
MS-6147
CPU Speed Setting: SW1
To adjust the speed of the CPU, you must know the specification
of your CPU (always ask the vendor for the CPU specification). The
mainboard can auto detect between 66 or 100MHz CPU Bus Frequency.
1. CPU Core Speed Derivation Procedure
The DIP Switch SW1 (1,2,3 and 4) 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.
ON = SHORT; OFF = OPEN
|
CPU TYPE
|
SW1
|
|
Core/Bus Ratio
|
1
|
2
|
3
|
4
|
|
2.5
|
ON
|
OFF
|
ON
|
ON
|
|
3
|
ON
|
ON
|
OFF
|
ON
|
|
3.5
|
ON
|
OFF
|
OFF
|
ON
|
|
4
|
ON
|
ON
|
ON
|
OFF
|
|
4.5
|
ON
|
OFF
|
ON
|
OFF
|
|
5
|
ON
|
ON
|
OFF
|
OFF
|
|
5.5
|
ON
|
OFF
|
OFF
|
OFF
|
|
6
|
OFF
|
ON
|
ON
|
ON
|
|
6.5
|
OFF
|
OFF
|
ON
|
ON
|
|
7
|
OFF
|
ON
|
OFF
|
ON
|
|
7.5
|
OFF
|
OFF
|
OFF
|
ON
|
|
8
|
OFF
|
ON
|
ON
|
OFF
|
NOTE: The CPU Bus Frequency is set at 66MHz or 100MHz by CPU
default
a: 66MHz CPU Bus Frequency
|
CPU TYPE
|
SW1
|
|
1
|
2
|
3
|
4
|
|
233 MHz
|
ON
|
OFF
|
OFF
|
ON
|
|
266MHz
|
OFF
|
ON
|
ON
|
ON
|
|
300MHz
|
OFF
|
ON
|
OFF
|
ON
|
|
333MHz
|
OFF
|
OFF
|
ON
|
ON
|
b: 100MHz CPU Bus Frequency
|
CPU TYPE
|
SW1
|
|
1
|
2
|
3
|
4
|
|
350MHz
|
ON
|
OFF
|
OFF
|
ON
|
|
400MHz
|
OFF
|
ON
|
ON
|
ON
|
|
450MHz
|
OFF
|
ON
|
OFF
|
ON
|
|