MSI MS-6163VA User Manual page 22

2.1-2 CPU Core Speed Derivation Procedure
1. This mainboard can auto-detect the Core/Bus (Fraction) ratio of the CPU
If
then
1
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
Note: SW1 will not exist on Jumperless motherboard.
CPU Clock
Core/Bus ratio
CPU core speed =
SW1
2 3
OFF ON
ON OFF
OFF OFF
ON ON
OFF ON
ON OFF
OFF OFF
ON ON
OFF ON
ON OFF
OFF OFF
ON ON
ON - Short OFF - Open
= 66MHz
= 3.5
Host Clock x Core/Bus ratio
= 66MHz x 3.5
= 233MHz
4 Core/Bus Ratio
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
2-17
CPU
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8