Computer system and method for controlling operating frequency of processor

A computer system of controlling a operating frequency of a processor, comprising:

• a platform controller hub configured to receive a first control signal of a command input unit, and generate and output a second control signal according to first firmware and the first control signal;
• a complex programmable logic device coupled to the platform controller hub and configured to receive the second control signal and generate and output a third control signal according to second firmware and the second control signal;
• a first switch coupled to the complex programmable logic device and configured to receive the third control signal, and be turned on to output a triggering signal when the third control signal is a valid signal;
• and
• the processor comprising a PROCHOT pin, the processor coupled to the first switch and configured to receive the triggering signal to trigger the PROCHOT pin to carry out frequency control.