I don't think we can get much out of these statistics, too many variables.

As already mentioned, you don't know how many threads are used or how high the allowed cpu time is nor you know if there's overclocking in use and how high this overclocking is or even underclocking for better performance/power.

As an example I've overclocked some time ago an Intel Core2Quad from 2,4 to 3,6 GHz (=+50%!) on air without any issues (sure, power went way more up than performance in comparison).

Intel's Core-Series had in it's entire life-time not an increase in performance as shown - per core per thread per clock it was not even 2x.
Sure, there are some new instructions (newer SSE, AVX, ...) but I don't think BOINC-Projects use these instructions heavily...