Significantly less the the energy it takes to cool current processors. Nearly five years ago I was talking to a professor who was at a conference on the future

Significantly less the the energy it takes to cool current processors. Nearly five years ago I was talking to a professor who was at a conference on the future of computing and there were folks there from the big 5 and he said that all of them had done the math on how much it cost to run their data centers vs run the cooling for cryogenic super conducting computers, and they all concluded that it was vastly cheaper to run at cryogenic temperatures, at least in part because they would drop the cost of running the cpus essentially to zero because they would all be superconducting.