Why it matters
PUE benchmarks efficiency. Lower = more IT per unit power.
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The architecture
Total power: IT + cooling + lighting + misc.
IT power: servers + network + storage.
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How it works end to end
Cooling dominates overhead.
PUE 1.1-1.2: excellent (hyperscale).
Water cooling + evaporation helps.
Also see: WUE (water), CUE (carbon).