Intel VX PENTIUM PCI User Manual page 12

JP7A, JP7B DIMM Socket Voltage Selectors
Voltage Selectors
Note: All synchronous DRAM JP7 must be set to 3.3V position.
JP8A, JP8B CPU Speed Selectors
The mainboard has a clock generator that lets you choose the CPU frequency by settings
jumpers JP8A, JP8B. You can set the CPU speed to 50/60MHz or 66MHz as shown below.
Jumpers 66MHz
JP8A Shut
JP8B Open
Note : Default set at 66Mhz
JP9A, JP9B CPU Internal Clock Speed Selectors
Intel
x2.0 (default)
x1.5
x2.5
x3.0
Note: CPU Internal Clock Speed = External Input Clock x (table list) factor.
JP10 P54C/P55C CPU Voltage Selectors
JP10 3.5V
ON A
A B C D E
(default)
Note : JP10 all OFF : 2.5V
3.3V
5.0V
CPU Speed
60MHz
Open
Shut
Cyrix AMD
x2.0 Reserved
Reserved x1.5
Reserved Reserved
Reserved Reserved
2.9V 2.8V
B C
A B C D E A B C D
Hardware Configuration
55MHz 50MHz
Open Shut
Open Shut
JP9A
Shut
Open
Shut
Open
2.7V
D
E A B C D E A B C D E
JP9B
Open
Open
Shut
Shut
3.3V
E
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