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Jumper Table Summary
C-2
INTEL P54C
Single Voltage
OFF
ON
ON
ON
OFF
3.45V
INTEL MMX P55C
Dual Voltage
OFF
OFF
OFF
ON
OFF
2.8V
AMD K5
Single Voltage
ON
ON
ON
ON
OFF
3.52V
AMD K6-166/200
Dual Voltage
ON
OFF
OFF
ON
OFF
2.9V
AMD K6-233
Dual Voltage
OFF
OFF
ON
ON
OFF
3.2V
AMD K6-266/300
Dual Voltage
OFF
ON
OFF
OFF
OFF
2.2V
Cyrix 6x86
Single Voltage
ON
ON
ON
ON
OFF
3.52V
Cyrix 6x86L
Dual Voltage
OFF
OFF
OFF
ON
OFF
2.8V
Cyrix M2
Dual Voltage
ON
OFF
OFF
ON
OFF
2.9V
IDT C6
Single Voltage
OFF
ON
ON
ON
OFF
3.45V
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
JP4
1-2
2-3
1-2
2-3
JP5
2-3
1-2
2-3
1-2
JP6
1-2
1-2
2-3
2-3
CPU External
Clock
Clock
60MHz
66MHz
75MHz
83.3MHz
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.
3.5x frequency ratio, and AMD PR166 is using 2.5x setting for
1.75x frequency ratio.
Warning: INTEL TX chipset supports only 60/66MHz external
CPU bus clock, the 75/83.3MHz settings are for internal test only,
set to 75/83.3MHz exceeds the specification of TX chipset,
which may cause serious system damage.
CPU bus clock, the 75/83.3MHz settings are for internal test only,
set to 75/83.3MHz exceeds the specification of TX chipset,
which may cause serious system damage.
Warning: Cyrix 6x86 P200+ uses 75MHz external clock, the
jumper setting shown on the table below is for user's convenient.
It may cause serious system damage to use 75MHz clock.
jumper setting shown on the table below is for user's convenient.
It may cause serious system damage to use 75MHz clock.
Warning: Although you may set 75MHz x 2 for Cyrix MX-PR200
and 83.3MHz x 2 for Cyrix MX-PR233, note that 75/83.3MHz
settings may probably cause serious system damage.
and 83.3MHz x 2 for Cyrix MX-PR233, note that 75/83.3MHz
settings may probably cause serious system damage.
INTEL
Pentium
Pentium
CPU Core
Frequency
Frequency
Ratio
External
Bus Clock
Bus Clock
S1
S2
S3
JP4 & JP5 & JP6