xrandr

Screen 0: minimum 320 x 200, current 2048 x 768, maximum 8192 x 8192
DIN disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1024x768+1024+0 (normal left inverted right x axis y axis) 300mm x 225mm
   1280x1024      60.0
   1280x960       60.0
   1152x864       75.0
   1024x768       85.0*    75.1     70.1     60.0     43.5
   832x624        74.6
   800x600        85.1     72.2     75.0     60.3     56.2
   640x480        85.0     72.8     75.0     66.7     60.0
   720x400        87.8     70.1
DVI-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 300mm x 225mm
   1280x1024      60.0
   1152x864       75.0
   1024x768       85.0*    75.1     70.1     60.0     43.5
   832x624        74.6
   800x600        85.1     72.2     75.0     60.3     56.2
   640x480        85.0     72.8     75.0     66.7     60.0
   720x400        70.1
   640x350        70.1