Idle temps at stock clock were in the low 50s, so I was pretty apprehensive overclocking with the stock cooler. The cube on ATI Tool heated the GPU into the low 60s. I tried some overclocking anyway, and even with a very mild overclock, I couldn't get through 3DMark06 without the program locking up. So, I install a Zalman FS-V7 that I had on an unused card. Idle temps immediately hit the low 40s.
Leadtek WinFast 7900GS