Asus P I-XP6NP5, User Manual, Page: 16 / 64

10 ASUS P/I-XP6NP5 User’s Manual
III. INSTALLATION
(Jumpers)
III. INST
ALLA
TION
5. CPU External Clock (BUS) Frequency Selection (JP8, JP9)
These jumpers tells the clock generator what frequency to send to the CPU.
These allow the selection of the CPU’s External frequency (or BUS Clock). The
BUS Clock times the BUS Ratio equals the CPU's Internal frequency (the ad-
vertised CPU speed).
6. CPU to BUS Frequency Ratio (JP10, JP11, JP12, JP13)
These jumpers set the frequency ratio between the Internal frequency of the
CPU and the External frequency (called the BUS Clock) within the CPU. These
must be set together with the above jumpers CPU External Clock (BUS)
Frequency Selection.
CPU : BUS Frequency Ratio (2.0x, 2.5x, 3.0x, 3.5x, 4.0x)
CPU External Clock (BUS) Frequency Selection
60MHz
JP8 JP9
66MHz
JP8 JP9
2.0x
JP10 JP1
1
JP12 JP13
2.5x
JP10 JP1
1
JP12 JP13
3.0x
JP10 JP1
1
JP12 JP13
3.5x
JP10 JP1
1
JP12 JP13
4.0x
JP10 JP1
1
JP12 JP13
Set the jumpers by the Internal speed of the Intel CPU as follows:
BUS Freq. CPU to BUS Freq. Ratio
Internal Ratio External JP9 JP8 JP13 JP12 JP11 JP10
200MHz 3.0x 66MHz [2-3] [1-2] [short] [open] [short] [short]
180MHz 3.0x 60MHz [1-2] [2-3] [short] [open] [short] [short]
166MHz 2.5x 66MHz [2-3] [1-2] [open] [short] [short] [short]
150MHz 2.5x 60MHz [1-2] [2-3] [open] [short] [short] [short]