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When you install a new CPU, be sure to adjust the board settings,
such as CPU type and CPU clock. Improper settings may
damage the CPU.
2.6.2 System clock setting (J5, J9, and J10)
J5, J9 and J10 are used to set the CPU and PCI bus speed to
optimize the system performance. The system chipset will sense
the J10 setting to get the bus frequency, then adjust its internal
timing. J9 is used to set the CPU and PCI clock. J5 is the CPU
clock ratio setting jumper. Refer to the CPU Speed Reference
Table (below) for instructions on adjusting the internal clocks
according to the base CPU speed.
Table
2-3:
CPU
CPU Speed (MHz) 75 100 *133 150 166
Clock setting
Frequency ratio
* default setting
Table
2-4:
Sys tem/PCI
System
50 MHz
PCI
25 MHz
2
1
* default setting
speed
references
50
66
66
60
1.5 1.5
2
2.5
cloc k
setting
60 MHZ
30 MHz
4
6
2
4
3
5
1
3
200
233
66
66
66
2.5
3
3.5
(J9)
*66 MHz
*33.3 MHz
6
2
4
6
5
1
3
5
Chapter 2 Installation
266 300 333
66
66
66
4
4.5
5
75 MHz
37.5 MHz
2
4
6
1
3
5
17
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