Asus P4B-LS User Manual page 41

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).
To select the CPU external frequency using the DIP switches, ensure
that the JEN jumper is set to jumper mode.
P4B-LS CPU
External Frequency Selection
Figure 2-24 CPU Frequency Settings
Set the CPU frequency only to the recommended settings.
Frequencies other than the recommended CPU bus frequencies are
not guaranteed to be stable.
ASUS P4B-LS motherboard user guide
SWITCH
CPU
PCI
®
P4B-LS
CPU
PCI
100MHz 105MHz 111MHz
33MHz 35MHz 37MHz
120MHz 125MHz 133MHz
30MHz 31MHz 33MHz
120MHz
40MHz
2-19