Section "Device"
    Identifier     "device0"
    Driver         "nvidia"
    BoardName      "nv"
    BusID          "PCI:1:0:0"
    Screen          0
        Option "AddARGBGLXVisuals" "true"
        Option "RenderAccel" "True"
        Option "AllowGLXWithComposite" "True"
        Option "backingstore" "True"
        Option "TripleBuffer" "True"
EndSection

Section "Device"
#adjust using 'lspci' or cat /proc/pci
    Identifier     "device1"
    Driver         "nvidia"
    BoardName      "nv"
    BusID          "PCI:1:0:0"
    Screen          1
EndSection