Frequency & Voltage Control; Spread Spectrum - Acer Aspire E571 Service Manual

Frequency & Voltage Control
It enables you to set the clock speed and system bus for your system. The clock speed and system bus are
determined by the processor you have installed in your system.

Spread Spectrum

If you enable spread spectrum, it can significantly reduce the EMI (Electro-Magnetic Interference) generated by
the system.
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