DFI AM75-EC, User Manual, Page: 78 / 99

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Award BIOS Setup Utility
CPU Host/PCI Clock
This field provides several options for selecting the external system
bus clock of the processor. When selecting the external bus clock, the
PCI clock will at the same time appear next to the external bus
clock selected. For example, if you selected “66/33”, 66MHz is the
external bus clock and 33MHz is the PCI clock. Regardless of the
type of processor used, the default setting is “Default”. Under this
setting, the system will run according to the processor’s clock
frequency.
If you selected an option other than the default setting and is unable
to boot up the system, clear the CMOS data by setting jumper JP8
pins 2 and 3 to On. All fields in the BIOS Setup will automatically be
set to their default settings.
Important:
Overclocking may result to the processor’s or system’s
instability and are not guaranteed to provide better system
performance.