PUE doesn't measure the useful output of a datacenter, only the energy that it consumes. That'd be like measuring the amount of gas an engine uses without noticing how far the car has gone.
Datacenter metrics should take into account how effectively a facility is able to convert watts into work rather than how much of that power is going toward compute versus cooling.
Nobody cares how good your PUE is if your datacenter is filled with inefficient servers that are terrible at turning watts into FLOPS.
Two decades later, they're better, and we need to focus on other metrics more relevant to today's problems.
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