papillon791 :
Motherboard : ASRock 970 Performance
Processor : AMD FX-8350 clocked at 4 GHz
CPU cooler : Cooler Master Nepton 140XL
I am using AMD Overdrive aswell and the temps are not near 124c on it...
AOD provides thermal margins which are the opposite of temperatures. At close to 0°C the CPU throttles; what are the thermal margins at full load and does the frequency drop to 1.4 GHz? If you run a stress test like P95 Small FFTs, the thermal margins should gradually decrease. If they all of a sudden become negative, then the VRM is throttling the CPU.
Your motherboard isn't bad at all, but you ignored the note "* For cooling the CPU and its surrounding components, please install a CPU cooler with a top-down blowing design." It's designed to work well with the stock cooler, but you use a liquid cooler that provides no cooling to the VRM. Install a fan to cool it and your issue should be resolved.