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Chapter 2: Hardware information
3. CPU frequency selection (SWITCH Switches 5-9)
This option tells the clock generator what frequency to send the CPU.
This allows the selection of the CPU’s external frequency (or Bus
Clock). The BUS Clock multiplied by the Frequency Multiple equals the
CPU’s internal frequency (the advertised CPU speed).
Set the CPU frequency only to the recommended settings.
Frequencies other than the recommended CPU bus frequencies are
not guaranteed to be stable.
To select the CPU external frequency using the DIP switches, ensure
that the JEN jumper is set to jumper mode.
P4B266-C
®
SWITCH
P4B266-C CPU
External Frequency Selection
ON
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ON
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ON
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ON
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CPU
AGP
PCI
100MHz
67MHz
33MHz
105MHz
70MHz
35MHz
111MHz
74MHz
37MHz
120MHz
80MHz
40MHz
125MHz
62MHz
31MHz
120MHz
60MHz
30MHz
CPU
AGP
PCI
CPU
AGP
PCI
CPU
AGP
PCI
ON
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133MHz
66MHz
33MHz