I have 3570k @ 4.5 Ghz, hyper 212 evo with push/pull (Corsair SP120s), with voltage at 1.136.
Max temps I see after 8 hours of p95 is 68C, and it's usually below that.
Why are you holding back? 68C leaves you with plenty of headroom. You can probably get an easy 4.7GHz.