Abit IT5E Series User Manual page 40

3-6
Normally, we do not recommend that you use the "User Define"
option to setup CPU speed and multiplier factor. This option is for setup
of future CPUs whose specifications are still unknown. The specifications
of all present CPUs are included in the default settings. Unless you are
very familiar with all CPU parameters, it is very easy to make mistakes
when you define by yourself the external clock and the multiplier factor.
/ Turbo Frequency:
This item will only be displayed if your CPU external clock
supports Turbo mode.
The Turbo mode allows you to speed up the external clock by
approximately 2.5%. This feature is used to verify the design
flexibility. It is a very important tool for test units to verify CPU
stability. Do not use this feature.
Solution in case of booting problem due to invalid clock setup:
Normally, if the CPU external clock setup is wrong, you will not be
able to boot. In this case, turn the system off than on again. The CPU will
automatically use its standard parameters to boot. You can then enter
BIOS Setup again and set up the external clock.
When you change your CPU:
IT5 series mainboards have been designed in such a way that you can
turn the system on after having inserted the CPU in the socket without
having to configure any jumpers or DIP switches. But if you change your
CPU, normally, you just have to turn off the power supply, change the
CPU and then, set up the CPU parameters through CPU SOFT MENU™.
However, if the CPU brand and type is the same, and if the new CPU is
slower than the old one, we offer you two methods to successfully
complete the CPU change operation.
ä Disable: CPU external clock is operating within the
normal limits.
ä Enable: CPU external clock is operating within the
limts of the Turbo mode.
Chapter 3