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Using the nvidia X driver requires some user modification. 

        First, modify your /etc/X11/XF86Config-4

        Minimum requirements:
        In Section "Module"
           add Load "glx"
           remove Load "dri"
           remove Load "GLcore"
        In Section "Device"
           Change Driver "nv" to Driver "nvidia"
        
        See /usr/share/doc/nvidia-glx/README.gz and
        /usr/share/doc/nvidia-glx/examples/XF86Config.sample.gz
        for descriptions of all supported options. 
        Appendix F:  CONFIGURING AGP is an important section.