SOYO SY-6VBA 133 Quick Start Manual page 9

Refer to the following table:
JP9 JP8
133/100# 100/66#
Short Short
1 2 1 2
Short Open
1 2
1 2
Open Open
1 2 1 2
*
This setting will tell CPU that it is running on 66MHz; this will release more multiplier
settings on some Intel CPUs, but it will make the system operate out of its
specifications if the actual FSB frequency is 100MHz higher.
Step 5. FSB boot-up frequency and AGP divider: JP2 and JP7
The settings of JP2 and JP7 determine the FSB frequency at boot-up, and more important,
they determine the AGP divider and the group of FSB frequencies that can be selected in the
BIOS. Refer to the following table:
JP7
Short Short Pin 1-2
1 2
Open Short pin 1-2
1 2
Open Short pin 2-3
1 2
As example, if JP7 is set to open and JP2 to (1-2), the boot-up FSB frequency will be
100MHz. When the BIOS takes control, it will write the BIOS FSB setting to the clock
generator. This happens shortly after power-up, and the FSB frequency will then be in
accordance to the BIOS setting. The group from which the FSB Frequency can be selected
in the BIOS is 90~122MHz and AGP Clock will be 60~81MHz. Note that all FSB
Frequencies are available in the BIOS, but that only those in the group as determined by JP2
and JP7 will have effect when selected.
SY-6VBA 133 Quick Start Guide
PII, Celeron
tell CPU its
FSB Speed
66MHz FSB
FSB = 66MHz Normal setting
FSB = 100MHz
FSB = 133MHz
Boot-up
JP2
FSB
66
1 2 3
100
1 2 3
133
1 2 3
9
PII,PIII
100MHz FSB 133MHz FSB
*
Possible higher
multiplier setting
Normal setting
Normal
setting
BIOS FSB
AGP divider
group
66~83
90~122
124~155
PIII
1
1.5
2.0