[ The PC Guide | Systems and Components Reference Guide | Motherboard and System Devices | System BIOS | BIOS Settings | Hardware Device Settings / "CPU Soft Menu" ] External Clock This setting controls the clock speed of the memory bus on the motherboard, and is normally 50, 60, 66 or 75 MHz. The internal processor speed is the product of the external clock speed of the motherboard and the multiplier used by the processor.
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