The hd4870 x2 will be better, but like wa1 said, better get something new. The hd6950 can be unlocked to a hd6970 and is a great value. I would get that. It also has a dual BIOS feature. The hd6950 would be about the same as an hd4870 x2, but it will have DX11, and better features, etc. When you unlock and OC, it will destroy a hd4870 x2, plus you don't need to deal with scaling.