Automatic dynamic processor operating voltage control

A method comprising:

• detecting a change in a ratio between a processor's core clock frequency and a frequency of a bus with which the processor communicates with other agents in a computer system (core/bus ratio);
• dynamically adjusting the processor's operating voltage in response to detecting the change in the core/bus ratio according to a linear equation wherein the core/bus ratio is a variable.

A system comprising:

• a bus to communicate information among a plurality of devices;
• a processor coupled to the bus, the processor including logic to dynamically change the voltage at which the processor is to function (operating voltage) in response to a change in the ratio of the processor core frequency and the bus frequency (core/bus ratio) without rebooting the processor and in a manner so as to prevent a user from placing the core/bus frequency and operating voltage combination that may harm the processor.

A processor comprising:

• first logic to determine a ratio between a frequency at which the processor core clock is to be set and a frequency at which a bus coupled to the processor is to be set (core/bus ratio);
• second logic to adjust the processor's operating voltage in response to the first logic determining the core/bus ratio and for preventing a user from adjusting the operating voltage.