i have an i5 4570 base clock is 3.2ghz with boost up to 3.6ghz but for some reason the highest it would go is 3.39ghz, nothing higher with a temp of 65C
it used to fully boost but it just doesn't anymore. i don't know why.
and this is even under 100% load in a xtu benchmark test
(never changed any voltages in core or cache) (just a lil bit of tweaking in graphics because i dont have an external gpu)