Intel System Board G4H875-N - Manual (Page 93)

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3
BIOS Setup
3.1.8.5 CPU Clock
This field provides several options for selecting the external system
bus clock of the processor. The available options allow you to adjust
the processor’s bus clock by 1MHz increment.
Important:
Selecting an external bus clock other than the default setting
may result to the processor’s or system’s instability and are not
guaranteed to provide better system performance.