Abit KD7 users give me some advice.

What sensor gives out the system temperatures? I'm using LM90 local at the moment. Doesn't seem right as it seems to change when I stress my proc which leads me to believe that it's the cpu surface temperature that is indicated in the bios vs the cpu core temp in the bios which should be LM90 remote? Anyway, it reads upper 30s which doesnt' seem right because right before I put this mobo in my epox was reading 30c. I have a compunurse that reads around 30 in the case also. So is this not the right sensor or is it just placed in a bad spot?