> I thought this was true for *all* processors?

No, as already said, RISC gets close to 1 instruction per clock cycle on 
average, but new CISC processors can do instructions in parallel inside the 
same core, so you can get more than 1 instruction per clock cycle on 
average.  Actually it seems like the latest Intel processors can do getting 
on for 20 instructions per clock cycle on average.

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