Everything would work. I would recommend a single, stronger card. But that would work.
Thank you so much! I would buy by a higher single-end card but I don't have a lot to spend so I've just decided to buy another 7850. I would sell my old one and get something like the 7970 but I'm really tired of doing so much work inside my computer and then having to sell and ship my components off. Let's just hope that I don't have the problems that can sometimes accompany crossfire configurations!