It's a good idea to upgrade your Xserver to 4.01. At the moment only RedHat 7.0 ships with this version of X but it is availabe from the X consortium's (how corny) ftp site – ftp.xfree86.org/. It provides direct acceleration and increased performance for a large number of accelerated cards and those with Nvidia cards are in luck for not only does X 4.01 natively provide excellent support for most of their cards but Nvidia have made available high performance OpenGL accelerated drivers – cheers to them. See XFree's home site – http://www.xfree86.org/ – for more info.