Intel System Board G4H875-B - Manual (Page 96)

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BIOS Setup
Frequency/Voltage Control
The settings on the screen are for reference only. Your version may not be identical
to this one.
CPU Clock Ratio
This field is used to select the CPU’s frequency ratio.
Important:
The frequency ratio of some processors may have been locked
by the manufacturer. If you are using this kind of processor,
setting an extended ratio for the processor will have no effect.
The system will instead use its factory default ratio.
Auto Detect PCI Clk
When enabled, the system will automatically send clock signals to
existing PCI devices.
Spread Spectrum
Leave this field in its default setting. Do not alter this setting unless
advised by an engineer or technician.
Async AGP/PCI CLK
This field is used to select the bus clock of the AGP and PCI.