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It's also straightforward to power-limit the RTX 40-series GPUs and cap the maximum wattage without losing much peak performance at all.
With an RTX 4090 GPU set to a 60% power limit and a modern high-end consumer CPU capped at ~100W TDP, you can easily run an entire RTX 4090 system with a decent 500W PSU and only lose ~8% peak GPU performance.
ectoplasmosis
chez_jay
But those calculators already consider absolute theoretical peak power with a safety margin. It would be running at a fraction of 650 W most of the time.