1.9 Switch and jumpers1 . CPU external frequency selection (DSW Switches 1-5)

The motherboard frequency is adjusted through the DIP switches. The white block represents the switch position. The illustration below shows the ON and OFF positions of the switches.

 

 

 

(Default)

ON

 

 

O 1 2 3 4 5

 

 

N

 

 

 

 

 

 

 

 

OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100MHz

66.67MHz

33.33MHz

A7V400-MX SE

A7V400-MX SE DIP switches

The option to set the CPU core bus frequency multiple is available only on unlocked CPUs. If you are using a locked CPU, setting the switches does not produce any effect.

The DSW switch 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).

The default CPU external frequency is 100 MHz. If your CPU supports 200/166/133 MHz external frequency, adjust the DSW settings before installing the motherboard to the chassis.

A7V400-MX SE

A7V400-MX SE CPU external frequency selection

DSW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Default)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O 1 2 3 4 5

 

O 1 2 3 4 5

 

O 1 2 3 4 5

 

O 1 2 3 4 5

 

 

N

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CPU

 

200MHz 166.67MHz

133.33MHz

 

 

 

100MHz

AGP

66.67MHz

 

 

66.67MHz

 

 

66.67MHz

 

 

66.67MHz

PCI

33.33MHz

 

 

33.33MHz

 

 

33.33MHz

 

 

33.33MHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F S B

 

 

 

 

 

CPU External Frequency

 

400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

200 MHz

 

333

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

166 MHz

 

266

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

133 MHz

 

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100 MHz

Set the CPU frequency only to the recommended settings. Frequencies other than the recommended CPU bus frequencies are not guaranteed to be stable.

ASUS A7V400-MX SE

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