Yep, gaming tech came a long way!
Its amazing what Rockstar pulled off with this game, even the last gen version is one hell of an achievment. It may run at 25-30 FPS, but no one else can even do that. Or even tries it.
If a GTX 760 can get this game to run 2160p @ 30fps (maybe low/medium?) Then I sure as hell can max this game out (I mean everything - sliders 100%) with my GTX Titan SC @ 1440p.