9 switch and jumpers – Asus A7V400-MX SE User Manual

Page 27

A S U S A 7 V 4 0 0 - M X S E

1 - 1 7

1.9

Switch and jumpers

1 .

C P U e x t e r n a l f r e q u e n c y s e l e c t i o n ( D S W S w i t c h e s 1 - 5 )

C P U e x t e r n a l f r e q u e n c y s e l e c t i o n ( D S W S w i t c h e s 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.

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.

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

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.

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).

A7V400-MX SE

O
N

1 2 3 4 5

O
N

1 2 3 4 5

O
N

1 2 3 4 5

O
N

1 2 3 4 5

A7V400-MX SE CPU
external frequency selection

DSW

CPU
AGP

PCI

166.67MHz

66.67MHz
33.33MHz

133.33MHz

66.67MHz
33.33MHz

100MHz

66.67MHz
33.33MHz

200MHz

66.67MHz
33.33MHz

(Default)

A7V400-MX SE

O
N

1 2 3 4 5

A7V400-MX SE DIP switches

OFF

100MHz

66.67MHz
33.33MHz

(Default)

F S B

C P U E x t e r n a l F r e q u e n c y

400

200 MHz

333

166 MHz

266

133 MHz

200

100 MHz