A bigger case would do a lot for you, although you could just take a side off your computer and use the side as a fan. That's what I did. It builds arm strenght... Seriously, though 91 degrees celsius is HOT! 195.8 degrees fahrenheit... It might not do too much to the video cards performance, but it's gotta be affecting your CPU/memory temps. I try to keep mine from reaching 58/48 respectively. You could start doing damage to your computer.
EDIT: BTW, my temps peak out about 72 and that is under sustained serious load, like 2 3dMrak 05 benchmark tests real close to each other, or America's Army full everything (4x/8x AA/AF) at 1280x1024 for more than two hours. That's on a seriously OC'd 6800LE (almost getting GT performance out of it).<P ID="edit"><FONT SIZE=-1><EM>Edited by geek64bit on 10/13/05 11:15 AM.</EM></FONT></P>