Asus A7N8X-XE - Manual

ASUS A7N8X-XE technical updates
A7N8X-XE technical updates
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1.9 Switch and jumpers
1. CPU external frequency selection (FSB_SEL0, FSB_SEL1)
The motherboard frequency is adjusted through the jumpers. The
illustration below shows the positions of the jumper caps.
A7N8X-XE
®
FSB_SEL0
FSB_SEL1
200MHz 266MHz 333MHz 400MHz
1 2 3 1 2 3 1 2 3 1 2 3
A7N8X-XE External frequency selection
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 jumpers 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 100MHz. If your CPU supports
200/166/133 MHz external frequency, adjust the jumper settings before
installing the motherboard to the chassis.
FSB CPU External Frequency
400 200MHz
333 166MHz
266 133MHz
200 100MHz
Set the CPU frequency only to the recommended settings.
Frequencies other than the recommended CPU bus frequencies are
not guaranteed to be stable.