Ok i got a different program(coretemp) and now i get these results... http://i.1dl.us/vqv.png
This program doesnt shot the second cpu like the first one... reason?
Core Temp just shows the core temps, not other temps, so that's one reason, but the 154C CPU and mobo temp from SpeedFan is probably just a non-existent sensor or one that SpeedFan doesn't recognize.
You're good to go, it looks like to me. Just ignore the 154C temps.