Microprocessor-assisted auto-calibration of voltage regulators

Dynamic runtime calibration of a processor with respect to a specific voltage regulator that powers the processor or a memory subsystem coupled to the processor can reduce or eliminate the need for guardbands in power management computations. The processor receives a current measurement from the voltage regulator and computes a calibration factor based on the measured value and a stored expected value. The calibration factor can be used in making power management decisions instead of adding the guardband to power readings. A manufacturer or distributor of the processor can compute the stored values with a controlled voltage supply that has a higher precision than typical commercial power supplies used in computing systems. The computed, stored values indicate the expected value, which can be used to determine a calibration factor relative to a voltage regulator of an active system.