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If it were 10 cores/CPU then 220,000 cores is 22,000 CPUs. At 100W per CPU that's 2,200,000W = 2.2MW. So more like a train than a Tesla!

Yes, and based on the $0.15/kWh comment, about $450/hour of electricity.

This is more in line with what I would have guessed for 220k cores.

So ~$300/hour in electricity.