VIA 82C693
MAINBOARD
HARDWARE SETUP
3-19
100MHz processors:
Pentium™ II-350, 400, 450 and 500MHz: 100, 103 or 112MHz selectable
Celeron™ -350 and 400MHz: 100, 103 or 112MHz selectable
BIOS Ddefault
: 100 or 103MHz (depends on the clock chip on the mainboard)
HOW TO SELECT THE CPU CLOCK RATIO:
Please modify the formula mentioned mentioned in previous page and we will get:
CPU Frequency
÷
FSB Clock = Clock Ratio
Now we can use the formula above to calculate the CPU clock ratio. Please refer to
the following illustration for the calculation:
For example, if you are installing the 300MHz Pentium™ II processor onto the
mainboard. You may look into the data sheet which comes with the processor or
the information in the previous page and you will see the FSB clock is 66.6MHz.
Now you may introduce these parameters into the formula and get:
300MHz
(CPU Frequency)
÷
66.6MHz
(FSB Clock)
= 4.5X
(Clock Ratio)
According to the example above, you can see that it is very easy to calculate the
CPU clock ratio when you have the information of your information of CPU
frequency and its FSB speed. In order to let you have a better picture of the
calculation, the procedures are summarized as following:
1.
Check the data sheet for your CPU frequency.
2.
Check the data sheet and get the FSB clock of your CPU.
3.
Use the following formula to calculate the CPU clock ratio.
CPU Frequency
÷
FSB Clock = Clock Ratio
