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ASUS A7V400-MX motherboard user guide
1-13
1.9 Switch and jumpers
1. 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.
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 100MHz. 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).
ON
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A7V400-MX
A7V400-MX DIP Switches
DSW
ON
OFF
ON
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ON
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ON
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A7V400-MX
®
ON
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A7V400-MX 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)