I too used an ATI Xpert98 before going to a banshee. Using the original GPL
demo I really didn't have any problems other than not knowing how much
better the graphics are with the 3dfx chip. One thing I can say for sure is
DON'T use any of the newer ATI drivers.
I never saw any improvements and most times the drivers hosed my system.
Stick with the drivers on the install cd.
Joe