I don't know, I should have said my system temp is 35*C max, there is no sensor for the NB temp. I don't know where the system temp is read from. Not sure why your temps are so high mate. 49*C sure is getting warm.

Is your NB heatsink mounted well and is it straight? (may have been damaged in transit) Assuming the system temp monitor is somewhere near the NB, it may be the cause. If not, no idea mate.