6
Technical Reference Booklet
Jumper Settings
This chapter explains how to configure the motherboard’s hardware. Before using your
computer, make sure all jumpers and DRAM modules are set correctly. Refer to this
chapter whenever in doubt.
CPU Speed Selection
When JP7 is installed on this motherboard, jumper is required to be set for different type
of CPU installed. The CPU speed is set by JP1, JP5 and JP7, please refer to the table of
JP7 and CPU marking. When JP7 is not installed on this motherboard, jumperless feature
is implemented such that no jumper is required to be set for different type of CPU
installed.
Notice:
1. Be sure to save the CMOS setting when exit the CMOS.
2. When you use 100MHz CPU Clock Speed, DIMM RAM must be PC100 standard.
3. Most PGA370 CPU is frequency multiplier locked, no CPU speed change will be
seen even if the frequency multiplier setting in CMOS setup is changed.
JP1, JP5 - System Bus Frequency
JP1
JP5
CPU Clock Speed
Open
Open
133MHz
(100MHz CPU run at 133MHz Front Side Bus)
Open
1-2
100MHz
(66MHz CPU run at 100MHz Front Side Bus)
Close*
1-2*
Auto*
JP7 - Ratio of Processor Core to System Bus Frequency
Ratio
JP7
Ratio
JP7
Ratio
JP7
3*
5
7
3.5
5.5
7.5
4
6
8
4.5
6.5
--
JP45 - On Board AC97 Codec Sound
JP45
Function
1-2*
AC97 Sound Enable*
2-3
AC97 Sound Disable
1
1
1
1
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
2
JP1
1
JP8
JP7
JP45
1
JP3
1
CN41
1
1
1
JP5
*
1
2
1
2
