SpeedFan is funny when it comes to detecting correct sensors sometimes. If you're uncertain which temp is your CPU, open a few large programs (AV, Email, Adobe, etc.) at once - the temp that spikes the quickest is the CPU temp.
Also, not certain if you knew this, but you can change the names of the Temps by entering the Configure area and selecting the temp you want to edit and pressing F2.
Edit: I think my Chipset temp was the default one shown. Whatever it was, it wasn't the CPU.