[aeyes]

Your CPU has 3.8GHz base clock (guaranteed), it can't sustain 4.6GHz turbo clock on all cores.

[fivefive55]

Yes, I know, but it never actually goes below 4.0 for me on all cores when doing a render. The 4.6 was referring to my 4770k which was at 4.6 on all cores all the time.