You might want to try different monitoring tools to retrieve your cpu and motherboard temperatures.
I have the same motherboard, and so far the best (and accurate) I found is HWiNFO64. Talking about it, this is the only tool with SIV being able to retrieve the CPU fan RPM value from the ITE IT8733 chip, even speedfan is clueless about.
And as dmdilks said, -55 is suspicious. Try a better tool as mentioned above.