I rebuild my machine recently and having reinstalled Speedfan it nicely labeled everything for me (had to label them myself last time). However, it's showing me two different sensors: CPU and Core. I'm not sure which one is actually the proper readout for my CPU temp, and when I was trying to research it I found someone that said:
"A very important note. Never use CPU temp to see how hot your CPU is. Use Core temp."There's a huge difference between the readings for the CPU and Core temperatures.

Any ideas as to which one I should be using? I tried opening a bunch of junk to see which one went up, and they both did.

AMD Athlon 64 X2 Dual Core 4800+ Socket AM2 Brisbane 2.51GHz
MSI K9A Platinum AM2 ATI CrossFire Radeon Xpress 3200 ATX AMD Motherboard