Chapter3 BIOS Configuration
ISA-E2 User’s Manual
15
JP5 ~ JP6: CPU Frequency Selector
JP5 and JP6 allow users to select the CPU FSB speed. It can be 66MHz, 100MHz
or 133MHz. Most of Pentium III CPU runs on 100MHz or 133MHz FSB.
However, Some Celeron CPUs run on 66MHz or 100MHz. User should select the
correct FSB speed to make their CPU run on correct speed and ensure the system
runs stably.
JP5~JP6
Setting
Function
JP5
: Pin 1-2 Short
JP6
: Pin 1-2 Short
133MHz
CPU FSB
JP5
: Pin 1-2 Short
JP6
: Pin 2-3 Short
100MHz
CPU FSB
JP5
: Pin 2-3 Short
JP6
: Pin 2-3 Short
66MHz
CPU FSB
The Core Frequency to Bus clock ratio of most of Intel Pentium III is locked.
Users do not require to change Jumpers JP4~7. These Jumpers are reserved for
Internal test purpose only.
NOTE: The BIOS setup Default value will program the SDRAM Memory bus
runs on same clock speed with CPU FSB, which is decided by JP5~6. However,
The CPU clock speed showed on the Boot message is not necessarily present the
Memory Bus speed. User’s may program the BIOS setup to run Memory bus in
different speed. Overclocking your processor and SDRAM module is not
recommended. There is no guarantee for any over-speed operation.
