Reducing power consumption in an integrated circuit is often desirable. However designers of integrated circuits often select a conservative supply voltage to ensure correct operation of the integrated circuits under all possible variations. This conservative approach often means that there is a substantial margin that is added to the critical voltage to account for uncertainty in the circuit models and to address potential worst-case combination of variabilities. However such combination of variabilities might be very rare or unlikely to even occur in certain implementations. Thus, such conservative approach is excessively conservative and is implemented at the expense of consuming more power that is actually necessary to ensure the proper operation of an integrated circuit.