Remove your CPU cooler, remove the thermal paste and clean the CPU and cooler with isopropyl alcohol, apply new thermal paste and install the Hyper 212 EVO CPU cooler.
Be sure the cooler is tight, if it's loose it will not cool properly.
Make sure the case wires are tucked out of the way so the system gets good airflow.
Always check the CPU core temps.
Your motherboards IMC is CPU/NB voltage.
Let me know what the CPU core temps are after you replace the thermal paste.
If the temps are good, you can run a stability test.