Arni: TjMax=100C is a myth for the L2 processors and all desktop processors that I know of. Intel TAT assumes TjMax=100C because it is a mobile / laptop testing tool. It was never designed for desktop processors but most programmers accept anything that TAT says as true because it has that nice little Intel logo on it.

Read the RealTemp docs and try doing the calibration test and post your results.
http://www.techpowerup.com/realtemp/docs.php

loonym: I would need to add support for the multipliers to make it a useful stand alone app. I'm just hoping that it calculates the MHz properly on all boards when using SetFSB. You have to write a lot of ugly code and formulas to try and get some accurate timing out of a Windows based computer when using SetFSB. Other than CPU-Z, there isn't any choice that I know of for accurate MHz when overclocking from within Windows. If I get some positive feedback from Grandpa or another user that has a board with this problem then I will add this new MHz code to RealTemp.