How far do electrons physically move in a single clock cycle in a (theoretical) 4GHz processor?
I was musing last night about computers and processors and this video of a 6-bit digital adding machine, and I know that 4 GHz seems to be the practical limit of mass-produced CPUs of the current era. Why is that the case? I was trying to imagine something like that 6-bit adding machine * 11 (ok, 10.6666...), lined up side by side, and operating 4 billion times in a second. It's mind-bending to me. XKCD has another take on it.
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