Yeah that was a problem with my Ultra. The things just get hotter over time. No real way I could figure out to keep them cool. What's your idle temperature by the way?
I'm hoping AS5ing the thing will help a bit, because as it stands I don't see the GPU withstanding repeat sustained trips over 100C without lasting damage. I keep checking the Dell Outlet for 1730s and 1710s with T7600Gs and 7950GTXes since I really don't think this is going to stop, and your description doesn't give me a warm and fuzzy. I trust your "figuring" included opening the thing up and AS5ing?