Your XF86Config has Option ¨NvAGP" ¨1¨
This is Nvidias AGP which is normally faster on supported chipsets.
There is a list of these in the Manual. /usr/share/doc/NVIDIA_GLX-1.0/README.
If AGPGART is compilled into the kernel it probably wont work. So to use AGPGART change to.
You can also remove that line and it will default to NvAGP ¨3¨ which will also use AGPGART first then try NvAGP.