Since my 4770k sucks so much I'm sticking with 43x for 24/7 operation.
No current game can push my system anyways...unless I'm gaming in 3D, but then I need another 7970, CPU OC won't cut it, so it's not worth it.
I'm starting to regret my Haswell, my i5 760 is running @ 3.6 Ghz @ stock voltage for over a year, I think, with a Hyper 212+. So much easier to OC.
I doubt I gained a lot in performance, but anyways...
Currently using these settings after a lot of testing:
1.20v core (though it goes to 1.212 when on 100% load. Tried 1.80v but crashed after 20mins prime95)
100 mhz bus (though I think it makes no difference settings it to 100 or auto'ing it...it's always at 99,8 or something)
RAM @ 11-12-12-30 @ 1.60v (even thought the XMP profile is 1.65v, I think the profile is overdoing it) - Kingston HyperX Beast 2400 16g
CPU system agent +0.1v (since memory stability is such a pain in the arse, the 2400mhz XMP profile doesn't even work)
Everything else on auto, EIST and everything on auto as well.
(I tried testing with vin, vring and **** but it didn't seem to do much for me)
Full load 65C TOPS, average temp is 60C full load. Idle is around 25C. With 44x multi it goes to 70C, 73C tops.
It's winter here, so I'm thinking in the summer my 65C max might go to 70C. So it's still all good.
Case fans @ minimum all the time.