Page 1
Appendix A
Jumper Table Summary
Setting the CPU Voltage
JP11
1-2
3-4
5-6
7-8
9-10
11-12
CPU Core Voltage (Vcore)
3.45V (Intel P54C)
3.52V (Cyrix or AMD K5)
2.9V (AMD K6-166/200 or Cyrix M2)
2.8V (MMX P55C)
3.2V (AMD K6-233)
2.5V/2.2V/2.0V (Reserved)
Warning: Please make sure that you have installed CPU fan
properly if Intel PP/MT-233 or AMD K6-200/233 is being
selected to use. It may cause your system unstable if you can
not meettheheat dissipation requirement from above CPUtype.
It is recommended to adopt larger fan on these CPU for better
air flow in the system.
Tip: Normally,for singlevoltage CPU, Vcpuio(CPU I/O Voltage)
is equal to Vcore, but for CPU that needs dual voltage such as
PP/MT (P55C) or Cyrix 6x86L, Vcpuio is different from Vcore
and must be set to Vio (PBSRAM and Chipset Voltage). The
single or dual voltage CPU is automatically detected by
hardware circuit.
Tip: JP11 pin 11-12 is reserved for future CPU, the most
possible value is 2.0V. It is not yet decided when this manual is
printed. Use voltage meter or check your distributor before you
use pin 11-12.
A-1
Page 2
Jumper Table Summary
CPU Type JP11 Vcore Vio Vcpuio
INTEL P54C Single Voltage 1-2 3.45V 3.45V Vcore
INTEL MMX P55C Dual Voltage 7-8 2.8V 3.45V Vio
AMD K5 Single Voltage 3-4 3.52V 3.45V Vcore
AMD K6-166/200 Dual Voltage 5-6 2.9V 3.45V Vio
AMD K6-233 Dual Voltage 9-10 3.2V 3.45V Vio
Cyrix 6x86 Single Voltage 3-4 3.52V 3.45V Vcore
Cyrix 6x86L Dual Voltage 7-8 2.8V 3.45V Vio
Cyrix M2 Dual Voltage 5-6 2.9V 3.45V Vio
Selecting the CPU Frequency
JP3
1-2
1-2
1-2
1-2
2-3
2-3
2-3
2-3
JP2
1-2
1-2
2-3
2-3
1-2
2-3
2-3
1-2
JP1
1-2
2-3
2-3
1-2
2-3
2-3
1-2
1-2
CPU
Frequency
Ratio
1.5x (3.5x)
2x
2.5x (1.75x)
3x
4x
4.5x
5x
5.5x
JP4
1-2
2-3
2-3
1-2
JP5
2-3
2-3
1-2
1-2
JP6
1-2
1-2
1-2
2-3
CPU
External
Clock
60MHz
66MHz
75MHz
83.3MHz
Warning: INTEL TX chipset supports only 60/66MHz
external CPU bus clock, the 75/83.3 MHz settings are for
internal test only, set to 75/83.3MHz exceeds the
specification of TX chipset, which may cause serious
system damage.
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.
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.
A-2
Page 3
Jumper Table Summary
INTEL
Pentium
P54C 90 90MHz = 1.5x 60MHz 1-2 & 1-2 & 1-2 1-2 & 2-3 & 1-2
P54C 100 100MHz = 1.5x 66MHz 1-2 & 1-2 & 1-2 2-3 & 2-3 & 1-2
P54C 120 120MHz = 2x 60MHz 2-3 & 1-2 & 1-2 1-2 & 2-3 & 1-2
P54C 133 133MHz = 2x 66MHz 2-3 & 1-2 & 1-2 2-3 & 2-3 & 1-2
P54C 150 150MHz = 2.5x 60MHz 2-3 & 2-3 & 1-2 1-2 & 2-3 & 1-2
P54C 166 166MHz = 2.5x 66MHz 2-3 & 2-3 & 1-2 2-3 & 2-3 & 1-2
P54C 200 200MHz = 3x 66MHz 1-2 & 2-3 & 1-2 2-3 & 2-3 & 1-2
INTEL
Pentium
MMX
PP/MT 150 150MHz = 2.5x 60MHz 2-3 & 2-3 & 1-2 1-2 & 2-3 & 1-2
PP/MT 166 166MHz = 2.5x 66MHz 2-3 & 2-3 & 1-2 2-3 & 2-3 & 1-2
PP/MT 200 200MHz = 3x 66MHz 1-2 & 2-3 & 1-2 2-3 & 2-3 & 1-2
PP/MT 233 233MHz = 3.5x 66MHz 1-2 & 1-2 & 1-2 2-3 & 2-3 & 1-2
Cyrix 6x86
& 6x86L
P150+ 120MHz = 2x 60MHz 2-3 & 1-2 & 1-2 1-2 & 2-3 & 1-2
P166+ 133MHz = 2x 66MHz 2-3 & 1-2 & 1-2 2-3 & 2-3 & 1-2
P200+ 150MHz = 2x 75MHz 2-3 & 1-2 & 1-2 2-3 & 1-2 & 1-2
Cyrix M2 CPU Core
MX-PR166 150MHz = 2.5x 60MHz 2-3 & 2-3 & 1-2 1-2 & 2-3 & 1-2
MX-PR200 166MHz = 2.5x 66MHz 2-3 & 2-3 & 1-2 2-3 & 2-3 & 1-2
MX-PR233 200MHz = 3x 66MHz 1-2 & 2-3 & 1-2 2-3 & 2-3 & 1-2
MX-PR266 233MHz = 3.5x 66MHz 1-2 & 1-2 & 1-2 2-3 & 2-3 & 1-2
CPU Core
Frequency
CPU Core
Frequency
CPU Core
Frequency
Frequency
Ratio External
Bus Clock
Ratio External
Bus Clock
Ratio External
Bus Clock
Ratio External
Bus Clock
JP1 & JP2 & JP3 JP4 & JP5 & JP6
JP1 & JP2 & JP3 JP4 & JP5 & JP6
JP1 & JP2 & JP3 JP4 & JP5 & JP6
JP1 & JP2 & JP3 JP4 & JP5 & JP6
AMD K5 CPU Core
Frequency
PR90 90MHz = 1.5x 60MHz 1-2 & 1-2 & 1-2 1-2 & 2-3 & 1-2
PR100 100MHz = 1.5x 66MHz 1-2 & 1-2 & 1-2 2-3 & 2-3 & 1-2
PR120 90MHz = 1.5x 60MHz 1-2 & 1-2 & 1-2 1-2 & 2-3 & 1-2
PR133 100MHz = 1.5x 66MHz 1-2 & 1-2 & 1-2 2-3 & 2-3 & 1-2
PR166 116MHz = 1.75x 66MHz 2-3 & 2-3 & 1-2 2-3 & 2-3 & 1-2
Ratio External
Bus Clock
JP1 & JP2 & JP3 JP4 & JP5 & JP6
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Page 4
Jumper Table Summary
AMD K6 CPU Core
Frequency
PR2-166 166MHz = 2.5x 66MHz 2-3 & 2-3 & 1-2 2-3 & 2-3 & 1-2
PR2-200 200MHz = 3x 66MHz 1-2 & 2-3 & 1-2 2-3 & 2-3 & 1-2
PR2-233 233MHz = 3.5x 66MHz 1-2 & 1-2 & 1-2 2-3 & 2-3 & 1-2
Ratio External
Bus Clock
JP1 & JP2 & JP3 JP4 & JP5 & JP6
Clear CMOS
JP14
1-2
2-3
Clear CMOS
Normal operation (default)
Clear CMOS
A-4
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