Orlean :
I concur with Footlong, do not use Auto voltage as it applies a value way higher than is actually needed. Nighthawk that is allot more voltage than should be needed for that clock speed you should use a negative offset voltage and lower in increments till you find whats stable for you. At 4.2ghz under full load I top out at 1.096v, I know mileage may vary from chip to chip but a difference of .1 is significant.
Ya I dont have Offset on my Mobo lol & The lowest I saw on Auto Voltage was1.096v to 1.188v to 1.210v less never went over 1.210v I saw couple people had to get 1.220v to stay stable!!! Last Night I oc my Pc at 4.5ghz at 1.290v so I'm good lol
Like I said you can leave it on Auto or Switch the voltage to 1.200v & see if that's Stable!!! If not Bump your voltage up till you find Stable for Cpu!! Test for Couple hrs on Aida64 or Prime95 & you Cpu-z watch the core voltage & Use Realtemp to Monitor your Temp dont wanna go over 95c wanna stay under!!!
& I cant seem to find the Mobo of what you have hmm it must be a good one idk lol & I wouldnt leave it on Auto either that up to you some pc are total different so it might increase alot of voltage!!! I know for sure you can hit 4.3ghz at auto voltage saw lots of people doing it but I would do a Real Overclock by changing the Voltage & find it Stable w/e oc you want!! & good Air Cooling by the way I have that on my System at 4.5ghz at 1.290v & highest temp I saw was 77 max