Does this card support nVidia's twinview? If so this is super easy. On my dual head card all I had to do to xorg.conf is:
Code:
Section "Device"
Identifier "NVIDIA"
Driver "nvidia"
Option "AGPFastWrite" "True"
Option "RenderAccel" "True"
VideoRam 262144
# twin-view
Option "TwinView"
Option "MetaModes" "1280x1024,1280x1024; 1024x768,1024x768"
Option "HorizSync" "30-110"
Option "VertRefresh" "50-160"
# Insert Clocks lines here if appropriate
EndSection
Notice in particular:
Option "TwinView"
Option "MetaModes" "1280x1024,1280x1024; 1024x768,1024x768"
If this isn't enough info for you, the nVidia README (comes with the video driver, or view at their website) has very detailed information on dual-heads and twinview.