The VGA Silencer will do the trick. I ran my 9800pro, flashed it with the XT bios, OCed it to 470/795, and ran that for almost a year just fine. I even got it over to 503 on the core with the VGA silencer.
A CPU refernce cooler will also do the trick, just requires modding it and the core het will not be vented out of the case. I've done this with a Ti4600 and that was 2 years ago.
<i><font color=red>Only an overclocker can make a computer into a convectional oven.</i></font color=red>