Cpu Core Speed Derivation Procedure - MSI MS-5187 User Manual

2.1-2 CPU Core Speed Derivation Procedure

1. The DIP Switch SW1 (1, 2, and 3) are 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
OFF
OFF
ON
ON
OFF
OFF
2. The DIP Switch SW1 (5, 6, 7, and 8) are used to adjust the CPU
clock frequency.
5
OFF
ON
OFF
OFF
OFF
=
=
=
=
=
SW1
2 3
OFF OFF
ON OFF
ON OFF
OFF OFF
OFF ON
ON ON
ON ON
OFF ON
SW1
6 7
OFF OFF
OFF OFF
ON OFF
ON ON
ON ON
66MHz
3.5
Host Clock x Core/Bus ratio
66MHz x 3.5
233MHz
CPU
Core/Bus Ratio
2
2.5
3
3.5
4
4.5
5
5.5
8
ON
OFF
ON
OFF
ON
2-2
Clock
CPU
66
75
83.3
95
100