MS-6153

CPU Core Speed Derivation Procedure (SW1)
If the CPU Core/Bus ratio is already fixed, adjusting the SW1 will not change the CPU Core/Bus ratio. If the Core/Bus ratio is not fixed by the CPU, then you can adjust the SW1 to change the Core/Bus ratio
.
ON = SHORT, OFF = OPEN

CPU TYPE
SW1
Core/Bus Ratio
1
2
3
4
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

2. CPU Bus Frequency Selector: J9
The J9 is used to set the CPU Bus Frequencies from 66MHz to 100MHz. When J9 is shorted, this will automatically detect the CPU Bus Frequency. When J9 is open, if you used 66MHz CPU, the Bus Frequency will set virtually into 100MHz.


a: 66MHz CPU Bus Frequency
J9
Feature
Short
Automatically detect 66MHz and 100MHz CPU Bus Frequency
Open
Virtually set 66MHz CPU Bus Frequency into 100MHz

NOTE: 1. This feature works with 66MHz FSB only. 2 If your CPU FSB supports 66MHz and you want to run it on 100MHz FSB, the J9 should be open. The AGP Bus will be set to run at 100MHz x 2/3 = 66MHz to make it stable.

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