Realtemp is what I would trust, especially if it's reading the same as coretemp. Those are generally the most accurate programs..
I have the same motherboard as you, and RealTemp is most accurate for me. Plus at stock speeds, you shouldn't be seeing anything in mid 60's.. at 100% load at 3.8Ghz I'm just hitting 70c on air.
And yes those temps are okay. You've got lots of headroom coming out of the 50's..
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