So after I got a new chassis with much better airflow and some arctic silver 5 thermal paste I decided to try overclocking my cpu some more. The problem is that it starts throttling at 58.5C no matter the voltage or clockspeed. Never had this happen before as my previous overclock was 4.1 GHz/1.25V and temperatures could get to 62C. Now if I run the same overclock CPU speed drops to 1400 MHz at 58.5C and then when it cools down to 53C it returns to 4100 MHz. I suspect my mobo VRMs overheating but I can't understand how they didn't earlier.
Specs: ASrock 970 extreme3 r2.0, fx6300, enermax ets-t40-tb cpu cooler. OS is win 8.1 pro.
Any help is appreciated