I am concerned that the third temperature sensor on my board (tmpin2) is over 20 degrees higher than my other sensors. I believe this is the north bridge. Is it normal for this to be quite high. On idle it is 55 degrees whilst my processor cores average 38 degrees C.
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You should check documentation for your mobo just to be sure, but I only start worrying once temps start going above 60C. You may want to invest in a chipset cooler in any case.