Everest is showing exactly what Core Center is showing... And core center dont lie when its updated and the bios is flashed....
you should probably check it with Motherboard Monitor 5, not everest.
MBM5 show's all your temp sensors, and allows you to specifiy with one is your CPU, or vise-versa with different sensors. That way you can be sertain that its not just a wrong Guess by the porgram.
EDIT: your CPU temp is always higher then ambient temp, and will steadily rise when you run Prime95. and steadily fall when Prime95 stops.