I have a NVidea 750TI, and the color or brightness is uniform accross all of the screen area.I do though have a 'band' about 3 MM around all edges. It can't seem to be adjusted through the card's Control Panel, so I assume it's the monitor. I could fiddle with the monitors settings, however,as my Grandmother used to say, "don't sweat the petty stuff; pet the sweaty stuff." Your situation isn't petty however.