Cpu Core Speed Derivation Procedure - MSI MS-6147ZX Manual

2.1-2 CPU Core Speed Derivation Procedure

1. 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. For example:
If CPU Clock
Core/Bus ratio
then CPU core speed
1
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
Note: The CPU Bus Frequency is set at 66MHz or 100MHz by CPU
default.
=
=
=
=
=
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/100MHz
4
Host Clock x Core/Bus ratio
66MHz x 4/100MHz x 4
266MHz/400MHz
4 Core/Bus Ratio
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
2-17
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8