My 6800 runs at start-up approx 40 C, under full load 3-D it rises to 50C. The ambient air is 20C, case temp 25C, I think the video card temp is directly related to the case temp. I leave the slot cover under the vc off, with the PS fan and 2-80mm fans in the upper-rear blowing out, I see air being sucked into the open slot cover and helping the vc cool.