Hardware Installation
2-8
2.2.2 Selecting the CPU Frequency
S1
OFF
ON
ON
OFF
ON
ON
OFF
S2
OFF
OFF
ON
ON
OFF
ON
ON
S3
OFF
OFF
OFF
OFF
ON
ON
ON
CPU Frequency
Ratio
1.5x (3.5x)
2x
2.5x (1.75x)
3x
4x
4.5x
5x
Intel Pentium, Cyrix 6x86 and
AMD K5/K6 CPU are designed
to have different Internal (Core)
and External (Bus) frequency.
The ratio of Core/Bus frequency
is selected by the switch 1-3 of
SW1.
Note: Intel PP/MT MMX 233MHz is using 1.5x jumper setting for
3.5x frequency ratio, and AMD PR166 is using 2.5x setting for
1.75x frequency ratio.
Core frequency = Ratio * External bus clock
ON
1
2
3
4
5
6
7
8
1.5x (3.5x)
ON
1
2
3
4
5
6
7
8
2x
ON
1
2
3
4
5
6
7
8
2.5x (1.75x)
ON
1
2
3
4
5
6
7
8
3x
ON
1
2
3
4
5
6
7
8
4x
ON
1
2
3
4
5
6
7
8
4.5x
ON
1
2
3
4
5
6
7
8
5x
