User Guide

Hardware Installation
2-6
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
Caution: Above table is possible settings of current CPU
available on the market. The correct setting may vary because
of new CPU product, refer to your CPU specification for more
details.
2.2.2 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
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 JP1, JP2, which CPU is using to
multiply external clock and produce
internal frequency. Note that JP3 is
reserved for future CPU.
Note: JP3 is reserved for future CPU. It is NC pin (no connection)
for current CPU on the market. It should be no harm to connect to
1-2 or 2-3. If you find any unstable problem, please try to remove
the jumper cap, and leave it Open.
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.