It was indeed the core temp as stated earlier. I also got CPUID's Hardware Monitor to verify.
So far with my 720 oc'd to 3.2ghz on air & stock hsf (16x200 @ 1.3750V) my temps were around 33 idle and 48 load.
I had a hell of a time getting it to 3.3ghz (16.5x200 @ 1.4500) temps were still 33 idle and moved up to 52 load.
And last, I got my 3.4ghz Stable. 17x200 @ 1.5v stressing in Prime95 gets me 56C on load. I guess it could be worse. Not sure if the 1.5v will be okay but it looks like a lot of people are doing it fine. I'll probably bench it and see if the small gain is worth the heat.