any chance your using a cooler master hyper Evo 212 or similar.. I only ask as my Old system was a FX based system and when I installed my aftermarket cooler master it made my temperature readings all strange... like I seen idle temps of 2°C (clearly not possible) but putting back the stock cooler provided me with more accurate temperatures as even in AMD overdrive my thermal margin was showing a 55+ degree availability , but again putting back the stock cooler was, in my case, what was needed to achieve more accurate readings.. why .. not sure.. just know it was