Stable operating frequency detector and method for the same

An automatic stable frequency detector and a method of finding a stable operating frequency in a computer system. The detector includes a central processing unit, a monitoring timer and a clock generator for providing a clocking frequency to the computer system. The method is capable of saving much user labor for calibrating the operating frequency of the motherboard of a personal or notebook computer. This is because personal or notebook manufacturers can set up the computer system to work at the highest stable operating frequency of whatever computer system through software or hardware.