So any ideas on how to mass market a 4.5 Kelvin cooling device?
That temp is in itself a feat of science.
I think all the global data centres would have to jack up their rentals to cover the cost of turning their HVACs down below freezing point.

I think the real story is that they managed to do this with a close-to-conventional CPU and maintain processing long enough at that temp to be able to measure it. Often, conventional items get de-natured along the sub-zero freeze path as they approach 0 kelvin. I think this success bodes well for the manufacturing process design work that has been done.

At least they know the devices will work in space without a heating system.

Hey there's an idea.
Let's build a supremely fast CPU grid in orbit and hire it out...
Ah! Now I see the motivation. :roll: