One more thing that could increase the fps rate
You can enable the Fast Writes and SBA for the nvidia drivers
in the file /etc/modules.conf
After the line with "alias char-major-195 nvidia"
have added this line
options nvidia NVreg_EnableAGPFW=1
and the 2d peformance screams now
on par with a radeon9000 (no more black rectangles when mooving mozillla/gnome console window )
On the 3d performance increased but here need to do some tests ...
In your case i think should write in /etc/modules.conf
options nvidia NVreg_EnableAGPSBA=1 NVreg_EnableAGPFW=1
Here is the full article about Fast Writes and SBA in linux
http://www.brandonhutchinson.com/NVI...Hat_Linux.html