Re: Interesting effect, wrong explanation
Apparently you didn't read the paper, and/or you don't understand it. It isn't about clock cycles. It's about side channel measurement of fine performance benchmarks and the differences noticed in these benchmarks between like CPUs.
Consider, the variation in performance affecting entropy if one processor's temperature is 7 degrees cooler than another--among other performance changing variables; such as workload.
Don't you love people who make crazy claims without at least trying to understand what is being said?