Is the 4850 not affected? I really don't see the point in this. As much as I love OCCT, the point in stability testing is not to throw a 200% load at it. It should (in my opinion,) be about a 90% GPU load, and monitor it for a good 2 hours.

I run Furmark on my 4850 to check my overclock sometimes, in Xtreme Burning Mode. That's enough if it passes that. I run OCCT for my CPU because it catches errors faster.

My 4850 hits 90c in Furmark, I'm not going to be stupid enough to run it up around 110-120c. That's just kind of pointless. If you run it that hot or with that much load it will eventually fail.