Abit AT6 User Manual page 26

3-4
CPU Operating Speed:
This option sets the CPU speed.
In this field, the CPU speed is indicated like this: CPU speed (external
clock x multiplier factor)
Select the CPU speed according the type and the speed of your CPU.
¡iNote 1 ¡jFor Intel Pentium II MMX CPUs, you can choose the following
¡iNote 4 ¡jUser define external clock and multiplier factor:
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.
settings:
ä 233 (66x3.5)
ä 300 (66x4.5)
ä User Define
/ External Clock:
ä 66MHz
ä 83MHz
/ Multiplier Factor:
You can choose the following multiplier factors:
ä 2.0
ä 3.0
ä 4.0
ä 5.0
However, differences will exist because of the various
brands and types available.
ä Disable: CPU external clock is operating within the
normal limits.
ä 266 (66x4)
ä 75MHz
ä 2.5
ä 3.5
ä 4.5
ä 5.5
Chapter 3