Malik Yolo :
thank you for replying, you're awesome. does PhysX or Hairworks make a big difference?
Hairworks is very new, and so far I think is only used in 2 games. It's in Cod Ghosts a bit, and it's going to be in The Witcher 3. Other than that, it doesn't make a difference yet, and people aren't sure whether it'll catch on or not. There's as much of a chance of Mantle catching on as Hairworks.
PhysX is used in more games, having been around longer. I think it's worthwhile, but not everyone does. You'll have to decide that yourself, really. The game where it makes the most difference is probably Borderlands 2. It's been used to moderate extents in Metro 2033, Metro Last Light, Warframe, Mirror's Edge, Batman Arkham series, Mafia 2, Planetside 2, Assassin's Creed Black Flag, and Hawken. It's been used only slightly in many other lesser known games, and when PhysX is relatively light it can be safely put on the CPU. It's not meant to run on the CPU though, so in the games that use it most heavily it'll disable effects or cripple the framerate if it's used without an Nvidia card. PhysX is scheduled to be used in The Witcher 3 as well.
This is a Borderlands 2 PhysX showcase. Keep in mind, this is probably where it'll be used most heavily, I don't expect other games will ever adopt it quite as much as Borderlands 2 did.
https://www.youtube.com/watch?v=2rokcD0nh4I