DFI G7L330-B - Manual (Page 86)

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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.
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.
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.