I see that you are new and using RedHat along with the nVIDIA drivers. The easiest way to install the nVIDIA drivers is the following way :
1)Goto their website and d/l bot tar.gz source files.
2)Then goto the instructions and queue up the modifications necessary to /etc/X11/XF86Config
3)unpack each tar.gz file by doing a tar zxf nameoffile.tar.gz
4)cd into the kernel dir and as root, do make
5)cd into the glxdir and do a make (again as root)
6)make the neccessary changes to the XF86Config file in a gui text editor (gedit is a nice one, although IIRC there is no icon for it, type gedit in the run box).
type glxgears to test your 3d acceleration. I get on my Athlon 900 + GF2ti (nv15) about 1100.