Hi, im a good gamer but i dont know shit about "computer parts" Im running my PC on 2 AMD Radeon HD 6800 series graphics cards, and i wanna know if it will be a good upgrade to change them to a GeForce GTX 780, or juste switch out one of the AMD HD 6800 for a Gtx 780. Or will that not make any noticeable FPS diffrence when i play games like BF4? Im now getting about 50 FPS when i play BF4 on High resolution, and its pretty laggy on Ultra resolution. Thanks