Abit AH6, User Manual

Page: 26 / 84

3-4 Chapter 3
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.
¡i
Note 1
¡j
For Intel Pentium II MMX CPUs, you can
choose the following settings:
ä
233 (66x3.5)
ä
266 (66x4)
ä
300 (66x4.5)
ä
333 (66x5)
¡i
Note 4
¡j
User define external clock and multiplier
factor:
ä
User Define
/
External Clock:
ä
66MHz
ä
75MHz
ä
83MHz ……………
/
Multiplier Factor:
You can choose the following multiplier factors:
ä
2.0
ä
2.5
ä
3.0
ä
3.5
ä
4.0
ä
4.5
ä
5.0 ……………
However, differences will exist because of the
various brands and types available.
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.
ä
Disable: CPU external clock is operating within
the normal limits.
ä
Enable: CPU external clock is operating within
the limits of the Turbo mode.