Been running at 451/1300 for a few days now, after opening up the system, thoroughly cleaning the fans, heat fins, grilles, etc., and reapplying AS5 to the GPU. I also BIOS flashed to JuanLu's unlocked frequencies 7800 GTX BIOS and can OC in the drivers now. Idles at 55C and maxes out at 90C at 1920x1200. At stock clocks it idles at 50C and maxes out around 85C. Note that I applied a +7 deg offset to RivaTuner which I use to monitor the temps because by default it underreports temps compared to the temp the driver gives.