Display different renderers

Hallo to everyone!
I need to display a video with a resolution of 3072x768. If I’m right there’s no way to customize the renderer size so that I have to use three renderer at 1024x768. Is it possible to link the three renderers to use them as one? Or is it possible to customize renderer’s size?
tks to everyone!!!

if your display supports that size the resolution will become available in the renderer setting
the onlything i know of supporting that res it matrox triplehead2go set to 75 hz