User Guide

Hardware Installation
2-5
2.2.1 Selecting the CPU Frequency
JP1
2-3
1-2
1-2
1-2
1-2
2-3
2-3
2-3
2-3
1-2
1-2
1-2
1-2
2-3
JP2
1-2
1-2
1-2
2-3
2-3
1-2
1-2
2-3
2-3
1-2
1-2
2-3
2-3
1-2
JP3
2-3
1-2
2-3
1-2
2-3
1-2
2-3
1-2
2-3
1-2
2-3
1-2
2-3
1-2
CPU Frequency Ratio
1.5x
2x
2.5x
3x
3.5x
4x
4.5x
5x
5.5x
6x
6.5x
7x
7.5x
8x
Intel Pentium II (Klamath)
is designed to have
different Internal (Core) and
External (Bus) frequency.
The ratio of Core/Bus
frequency is selected by
JP1, JP2 and JP3, which
CPU is using to multiply
external clock and produce
internal frequency.
Core frequency = Ratio * External bus clock
JP3 & JP2 & JP1
1
2
3
3x
JP3 & JP2 & JP1
1
2
3
4x
JP3 & JP2 & JP1
1
2
3
3.5x
JP3 & JP2 & JP1
1
2
3
4.5x
JP6
1-2
2-3
JP5
1-2
2-3
CPU External Clock
66MHz (default)
60MHz
JP6 and JP5 are selection of CPU
external clock (bus clock). JP6 is
actually the selection of clock from
clock generator and JP5 is used to
inform chipset the CPU bus clock.