PUE (power usage effectiveness)
Beginner
A score for how much extra electricity a datacenter (a building full of computers) spends on cooling and other needs. 1.0 would mean none at all.
Novice
Total power entering the datacenter divided by the power reaching the computers (IT equipment). A PUE of 1.4 means 0.4 W of cooling, power conversion and lighting for every 1 W of computing.
Expert
An annual average for a facility, not a property of a chip. It multiplies IT energy in a TCO model but says nothing about how efficiently the IT power is used, which is why MLPerf Power leaves it out.
Explained in Comparing chips (Architectures).