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Appendix
Appendix D
CPU Clock Frequency Selection In BIOS Setting.
There is a special function for CPU over-clocking requirement which can be chosen and set
by BIOS or set by JP3(The undocumented jumper setting from 103MHz to 133MHz), please
refer to the following steps for adjustment.
1. Enter the BIOS CMOS setup program. (If your system was operated at 66MHz)
2. Choose "Chipset Features Setup" in main menu.
3. Use "Page down" (or+) / "Page up (or -) to choose CPU clock frequency as one of 66.8,
75MHz and 83.3MHz.
(Note: There are 66.8, 75 and 83.3MHz for 66MHz pentium II CPU CLOCK frequency show
only).
4. Press "Save & Exit setup" to complete BIOS setting.
If screen becomes blank or system can't boot anymore after above setting. that means your
CPU couldn't be capable of supporting overclock, and you have to follow the steps below to
recover the CPU clock frequency.
Step 1: Power the system off. (J3 PW-ON)
Step 2: Press <INS> (Insert) key while powering on the system, system will function with
66MHz external frequency at this moment which depends on what kind of
CPU on board.
Step 3: Please choose lower frequency and try again.
Warning:
We do not guarantee all CPUs can be over-clocked (When the undocumented set by BIOS[75
and 83.3MHz] or by JP3[103 to 133MHz]), it depends on CPU design and the peripherals you
are using; it's vitally important to use faster peripherals (faster SDRAM, AGP, I/O card...) to
come with the higher CPU clock frequency.
Please set apporpriate CPU CLOCK frequency to make the system stable.
A-10
EP-61BXC-A
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