Primatelabs provide benchmarks for: 32 bit 1 CPU, 32 bit threaded, 64 bit 1 CPU, 64 bit threaded.
https://browser.primatelabs.com
Useful information if your workload is single threaded.
Note that their usage of the word browser is nothing to do with www browsers.
Oh, Geekbench which can be 'won' by implementing a single encryption instruction in hardware.
Still, even looking at the scores for less broken sub benchmarks, like (possibly) lua and dijkstra show a %50 increase in performance from Westmere to Skylake for the same frequency, which is more than I was expecting. And skylake should potentially clock much higher although I believe the top is currently still 4ghz.
Of course for anything that can take advantage AVX2 (or AVX3 for xeons) skylake would smoke the old xeon.
edit: reword
I'm asking because I recently "upgraded" my desktop to a cheap westmere 6 core xeon [1] as in most benchmarks it is competitive with recent i7s.
[1] x5670 @3ghz, but should easily overclock well into the 4ghz range.
Edit: autocorrect