Well maybe your graphics card is underperforming because I have the same graphics card(760) and I can play most games high to ultra, starting from far Cry 4 (high/ultra), Tomb raider (ultra), assassin's creed black flag (ultra), metro last light (high/ultra) with only assassin's creed unity which runs at medium.
(all games running at the 40fps mark which I think is smooth enough, and fxaa or smaa anti aliasing which I have used it at 2x)