5760 x 1080? What settings do you play at and what FPS do you get?
So for a game like batman arkham asylum I play on max (without AA) and I get 60fps. More modern games I have to fiddle about to get 60. Normally I play them on very high with a few of the more intensive settings set to medium and get 60 FPS.
My Setup: http://tinyurl.com/d395sf6 PSN/XBL/Steam: Willavom