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How would it use 1kW? Socket SP3 tops at 280W and the system in the article has a 850W PSU so I'm not sure what I'm missing.

I assume that the parent just rounded 850W up to 1kW, no?

Yeah i was vigorously waving hands. Even at 200W, 10 cents/kWh you'd need to run this a LONG time to break even