What s/w for reading temps on amd x2

[Carter]

I'm tweaking my x2 3800, but i'm confused by different s/w giving wildly varying readouts. i.e Core temp says core1 = 50c core2=60c whereas speedfan, everest, mbm have coretemp much lower. Using 1.44v. That was under prime95 after about 25 minutes.