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RobinZ comments on The Irrationality Game - Less Wrong
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1 THz semiconductor-based computing will prove to be impossible. ~50%
(Note for the optimistic: I expect multiplying cores will continue to increase consumer computer performance for some years after length-scale limitations on clock rate are reached.)
At that speed, you have less than 0.3 mm per clock cycle for your signals to propagate. Seems like you'd either need to make ridiculously tiny gadgets, or devote a lot of resources to managing the delays. Seems reasonable enough.
You would agree with my stated confidence? I'm not sure what physical processes limit the size of elements at the bottom end - for all I know, they might already hit at 100 GHz.