Smooth for me would be no lower than 30. I've heard the human eye can only refresh at no more than 30 FPS anways. But of course the higher the better for me. In AA i usually get 80-90 and thats with all settings on Ultra High. But it also depends on the game and the size of maps too. Like in Joint Ops i only get a max of 55, but in Ghost Recon and can get a max of 1600