Could be just luck of the draw, or possibly other factors. I had a 965xe and a 970 and both pretty much topped out at 4.1-4.2. Both needed 1.35 for 4.1. And I think my 970 needed closer to 1.5v for 4.2. Great chip but terrible core and uncore clocks. I think it didn’t like more than 3200. This was on a UD5, I moved to a Rampage III Formula and x5690 shortly after. I wouldn’t mind a W series hexacore because I have a few sets of sweet Hypers, BBSE, and PSC but could never take advantage of with the x5690. Those Hypers are as flexible as a gymnast. Love em.
3770K @ 4700 1.375v|Le Grand Macho RT/TY-143|Asus P8Z77-V|8GB G.Skill Mix @ 1100 9-11-9-28 2T 1.665v|Intel 545S @ Raid 0|EVGA GTX 980 Classified @ 1500/1903|CM Silent Pro M2 850|FD Meshify C
X5690 E.S. @ 4293 1.375v|True Spirit 140 Power/TY147B|Asus Rampage III Formula|10GB G.Skill Mix @ 800 9-9-9-24 2T 1.55v|Intel 520|EVGA GTX 970 FTW ACX 2.0 @ 1475/1853|TT TP650|FD Define R4