SUPER P6SLA/P6SLE User’s Manual
2-8
2-3 Changing the CPU Speed
To change the CPU speed for a Pentium II processor, change the
jumpers shown below on Table 2-1. Refer to Table 2-2 for the
external bus speed jumper settings. The default bus speed is 66
MHz. The following example will show you which CPU Core/Bus
Ratio to use. The general rule is to divide the CPU speed by the
bus speed (66 MHz). If you have a 266 MHz CPU, dividing it by 66
will give you a CPU Core/Bus Ratio of 4. After determining the
CPU Core/Bus Ratio, refer to Table 2-1 for settings of JB1, JB2,
JB3 and JB4.
CPU Core/Bus Ratio =
CPU Speed
Bus Frequency
CPU Core/Bus Ratio =
266 MHz
66 MHz
Table 2-1. Pentium II Speed Selection
CPU Core/
JB1
JB2
JB3
JB4
Bus Ratio
3.0
ON
OFF
ON
ON
3.5
OFF
OFF
ON
ON
4.0
ON
ON
OFF
ON
4.5
OFF
ON
OFF
ON
5.0
ON
OFF
OFF
ON
Table 2-2. External Bus Speed Selection
MHz
JC1
JC2
JC3
50
ON
ON
ON
60
ON
OFF
OFF
66
OFF
OFF
OFF
75
OFF
ON
OFF
= 4.0
Summary of Contents for SUPER P6SLA
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Page 11: ...SUPER P6SLA P6SLE User s Manual 1 2 SUPER P6SLA Figure 1 1 SUPER P6SLA Motherboard Picture...
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Page 81: ...BIOS User s Manual A 4...
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