[evilghost]

I've got a Go5700, hopefully these snippets from my xorg.conf will help you:

Section "Device"
        Identifier      "NVIDIA Corporation NV36 [GeForce FX Go 5700]"
        Driver          "nvidia"
#       Driver          "nv"
        BusID           "PCI:1:0:0"
        Option          "NvAGP" "3"
        Option          "RenderAccel"   "true"
        Option          "Coolbits"      "1"
        Option          "NoLogo"
        Option          "AllowGLXWithComposite" "true"
        Option          "AddARGBGLXVisuals"     "true"
        VideoRam        65535
        #Option                 "TripleBuffer"          "true"
EndSection

Section "Monitor"
        Identifier      "DFP-0"
        Option          "DPMS"
        VertRefresh     51-75
        HorizSync       51-150
        Modeline        "1440x900" 97.54  1440 1472 1840 1872 900 919 927 946
EndSection

Section "Screen"
        Identifier      "Screen0"
        Device          "NVIDIA Corporation NV36 [GeForce FX Go 5700]"
        Monitor         "DFP-0"
        DefaultDepth    24
        SubSection "Display"
                Depth           24
                Modes           "1440x900" "1024x768" "800x600" "640x480"
        EndSubSection
EndSection