I am still a 1440P pauper and pretty much only playing The Division and I have everything set to max in settings and pretty much sit at 60 fps constant and only drops to 50 in big explosions on my TX, so yer, 1440P and below only needs one decent GPU but those with higher resolutions could do with a pair of GPUs for the most demanding games but over 2, I don't really see the point or benefit personally.