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.. at a temperature of 3.5K. So perhaps not super practical.


It's not practical for your desktop computer, but a tank of nitrogen and some refrigeration hardware which fits in a single rack and you can run at 3.5K in a data center.


3.5K is well below the point where nitrogen is liquid. The only option would be helium.


Just to point, but it would require actively cooled helium. You can't just drop it in liquid helium and expect boiling to cool your device.


Can you make a closed loop helium cooler? Also, that level of coldness seems like it would have negative interactions with other components.


> Can you make a closed loop helium cooler?

An MRI machine is a giant magnet with a closed loop helium cooler to keep the superconducting coils cold. A chiller is used to reject the heat outside.


Nitrogen freezes at 63K. That makes it a bad coolant for a continuously-running process at 3.5K.




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