Replaced my Fatal1ty z77 with an ASUS Maximus V Formula. On the ASRock board I needed 1.246v to run @ 4.6GHz. On the ASUS board I only need 1.213v. The offset is the same on both boards +0.030
Temps are way down as a result. FATAL1TY MAXIMUS V
I couldn't get 4.7GHz stable on my ASRock but this ASUS board will do it easily.