????
I have another monitor hooked up to my ATi Card and my FPS hasnt dropped at all,
well clearly a good video card wont have an issue.
but all ati/amd vid cards split the resources 50/50 no matter what you are doing on either monitor.
while nvidia drivers fix this, by knowing wtf a game even is rather then any generic 3d rendering, and putting more power to the correct side.
no point in cutting your high end video card in half just to look at some browser tabs lol