1. A method for monitoring a physical variable associated with an electronic component within a computer system, the method comprising: receiving telemetry signals of the physical variable which are collected by one or more physical sensors associated with the electronic component; collecting electromagnetic interference (EMI) signals generated by the electronic component; building an inferential model for the physical variable by correlating the EMI signals with the telemetry signals; and using the inferential model to infer values for the physical variable from the EMI signals.