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Originally Posted by VonKatzen
Assuming that quantum computers and digital AI are not actually possible what limit does that put on computer Complexity ratings and software functionality?.
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None really. Nothing particularly prevents you from building computers the size of planets. For computers of the same size as we now build, well, we've only got a little more than 1 order of magnitude (1 complexity step) left on the chips before some of the circuit elements would need to be less than one atom wide, which isn't physically reasonable, but there is stuff outside the chips that could be shrunk too, and you could probably redesign chips for more interconnectivity that would increase complexity without changing their size too. Still we probably aren't more than 3 complexity steps away from the absolute physical limits.
Note however that there is no particular requirement for computers to be digital, and we *know* there is a physical implementation of intelligence that doesn't require a amount of huge hardware - it manages to run on human brains after all.