baleworf: Your temps don't look too out of the ordinary. Here's how my Q6600 looks like at 1600 MHz. The room temp is 21C.
http://img141.imageshack.us/img141/3...estmay9gs6.png
I need to use calibration factors of approximately +1,+1,+2,+1 so that my idle temps are pretty well balanced. Since that screen shot I've introduced the ability to use decimal calibration factors which gets things a little closer yet.
I don't believe you have sticking sensors. A little unbalanced maybe but calibration can really help that out. Try posting two screen shots at 1600 and at 3700 MHz. Show RealTemp and CPU-Z to report core voltage. With a well ventilated case there won't be a huge difference in temps but you should see something if your testing methods and room temperature are consistent. I like doing this kind of testing with the case open. No matter how good your case is, I usually see lower temps with an open case.