I have an AMD A8-6600k. I'm wondering what card I should buy to crossfire with the apu, and would I need a crossfire bridge with the card to install it? I'd prefer to keep the prices as low as possible. I was looking at the box and it says it's compatible with a 6570, so I was looking into the XFX 2gb version of that. What I want to do is be able to run games like skyrim and dark souls, which I currently cannot do.