randomizer: What I found during testing is that if you leave MSR 0x19A set to 0x12 and then stop Prime95 your temps will drop down one more step and then while idle if you set MSR 0x19A back to the default 0x02, your temps will drop another degree or two. I think it lets your processor go into a slightly lower power state but don't quote me on that. With my Kill-a-Watt meter plugged in, power consumption drops a couple of watts.

Your graph shows that your sensors are working fine and aren't sticking. There's no way my E6400 - B2 is TjMax=70C like Intel has recommended but for your E6600, it looks possible. Did you ever do the low MHz / low voltage test? I'll go look back a few pages. I'd try TjMax = 70C or 75C and see how things look during this test. Now that rge has cleared up what the low end should look like and Intel has given us some guidance on what TjMax might be, maybe you can finally make some sense out of your sensors.

How do you like the ability to manipulate the power level your CPU is running at? Prime95 small FFTs is my fav for keeping the power level consistent. Anyone with sticking sensors that plots a graph like you did will end up with the lower part of the graph going horizontal but yours looks good. I plan to add power level adjustment into RealTemp for testing in the near future and then maybe have it test automatically and draw a nice graph like you showed us sometime in the future.