Hi
Was the thermal paste pre applied to your heatsink by the manufacturer?
Or did you apply it yourself
Many people apply too much so it acts as a barrier to heat transfer
And can spread beyond top surface of cpu
Should be sized as a few grains of rice , not pea sized
Be careful not to pull vertically as you can pull cpu out of socket which usually bends some pins.
Also check for other causes of over heating like blocked filters , case fans not running, cpu fan not running fast enough, heat sink fins covered in dust
Is CPU fan speed controlled by device driver or bios?
Over clocking with stock amd heatsink + fan ?
Regards
Mike Barnes