ITUE (IT-power usage effectiveness)
Beginner
A score like PUE, but for inside each computer: how much of the power going in actually reaches the chips.
Novice
The total power into the IT equipment divided by the power used by the computing parts (processors, memory, storage). The rest goes to fans, power supplies and voltage regulators.
Expert
Proposed by the Energy Efficient HPC Working Group as “PUE for the server”: . Fans, PSUs, voltage regulators and management controllers are overhead; it needs component-level power telemetry to measure well.
Explained in Power and cooling (Systems).
See also: PUE (power usage effectiveness), TUE (total-power usage effectiveness).