No reason not to run it in 1920x1080(1080p) with that card.
Seeing as I run 1680x1050 with my card without any drop in FPS at all I see absolutely no reason as to why you shouldn't be able to run it in 1920x1080.
Ok that sounds good guys. I didn't want to start heavily messing around with things in the first place. I'm trying to figure out why I can't get God of War maxed or at least 90% (and above) the whole time. So I didn't want to be messing around with different resolutions making everything more out of whack.