So OC'ed my 4670k to 4.3 with 1.175.
Forgot to set adaptive to manual, which explained to me why there was using more voltage (1.28) than needed.
Thanks for reminding me in the intro post.
I think that this is quite good, but Since this is my first time OCing on air(212 evo with PK3 BTW) I don't know if it's good or not.
Also, when on the desktop with no windows, voltage and clock is still at 4.3 and 1.175. Shouldn't it be like the base clock and lower voltage? I had adaptive on during that time. Strange..
Will edit this post later for the more results.
Need more info on your system. You'd have to manually enable the C-states in the bios for them to actually work and make sure that EIST is enabled.