Guys I have Nvidia GeForce Gtx 750 1gb Vram annd my friend is about to give me Nvidia GeForce Gtx 680 2gb vram. My question is, should I replace my 750 1gb for 680 2gb. I've hered that gtx 680 is a much better card that gtx 750, but its kind of older so I'm kind of confused. What should I do guys ?