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A comment on New superconductor microprocessor yields a substantial boost in efficiency. Parent comment

Re:New superconductor microprocessor yields a substantial bo... by mdturnerphys on Wednesday January 13, 2021 @03:11PM (#25767334)
That's the cost for one-time use of the helium. If you're running a liquefier the cost is much lower, since you're recycling the helium, but it still "costs" ~400W to cool 1W at 4K.
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Re:New superconductor microprocessor yields a substantial bo... by pushrax on Wednesday January 13, 2021 @11:11PM (#25771879)
In other words, the helium is used to move heat around, and isn’t lost. It’s like the refrigerant in your air conditioner, except that it needs several stages of pre-cooling.

Initial cost is high but running it should mostly just incur energy costs if it’s well designed.

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