tomxor 6 hours ago | root | parent | prev | next [–]
> CPU heat output is limited by the resistance of the semiconductors.
Technically true but not applicable... Super conducting CPUs already exist (at below room temp), and they don't use semiconductors. They don't have an exact transistor equivalent but use digital logic circuits such as Quantum Flux Parametron (QFP) and rapid single flux quantum (RSFQ), which are comprised of Josephson Junctions [0] which are made from the same super conducting material. Relying on quantum effects of a gap between two conductors rather than specific material properties.
So while it is true that CMOS are limited by the resistance of both the conductor interconnects AND the semiconductors. Super conducting circuits only appear to need a conductor... There are other drawbacks, such as larger feature sizes due to the nature of super conducting materials, and QFP and RSFQ might be more complex? but this is potentially offset by huge advantages: zero resistance buys not only power efficiency and minimum heat generation (as required by landauer limit), but also allows circuits to be driven at a higher clock, so far demonstrated to 770GHz for one CPU [1]
[0] https://en.wikipedia.org/wiki/Josephson_effect
[1] https://spectrum.ieee.org/superconductor-logic-goes-lowpower
interesting comment i found
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git revert 5d4a7ab
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???
I'm not leaving entirely, won't get rid of me that easily, I'll be hanging around
