I never get anyting else indeed. I was hoping that someone here could also debug the minidump file to make sure nothing else is the cause and that I followed the correct debug path to the cause.

How to read the temps in GPU-z because my 5870 is a single GPU while several GPU temps are provided? I'm not sure which temp to look at. The temp of GPU #3 worries me. Is 97 degrees compared to GPU #1 and GPU #2 to much?

I installed ATI 12.6 driver, turned up the fanspeed manually to 40% and turned Aero off in Windows. My systems now runs for 2 days without a BSOD. So fingers crossed!!!!