IMO, try running HWMonitor and Real Temp instead of Speed Fan. The problem with Speed Fan is you need to edit the names yourself, so it's quite possible that you have the sensors mixed up as far as what's what. Generally speaking, the CPU temp is roughly equal to your core temps. You may also have the GPU temp showing as well, and/or NB temp. I don't know specifically with your mobo what sort of temp sensors it has. HWMonitor does a pretty good job of putting all the temp sensors where they should be... give that a try and see if it makes any more sense.