2.7Switches and jumpers

2.7.1 Switch settings

The motherboard frequency is adjusted through the DIP switches. The white block represents the switch position. The illustration below shows all the switches in the default position.

P4B-M

P4B-M DIP Switches

Figure 2-21

DIP Switches

DIP_SW

ON OFF

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

3

 

 

ON

 

1 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.Frequency Selection

2.Frequency Selection

3.Frequency Selection

4.Frequency Selection

5.Frequency Selection

CPU frequency selection (SWITCH Switches 1-5)

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).

DIP_SW

P4B-M

 

 

 

 

 

 

5

 

 

 

5

 

 

 

 

5

 

 

 

5

 

 

 

 

 

4

 

 

 

4

 

 

 

 

4

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

3

 

 

 

 

3

 

 

 

3

ON

 

 

 

1 2

ON

 

1 2

ON

 

 

1 2

ON

 

 

1 2

 

 

 

 

 

 

 

 

P4B-M CPU

External Frequency Selection

CPU 100MHz 105MHz 133MHz 141MHz (Default)

Figure 2-22 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-M motherboard user guide

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