Cheap graphics card.....?

I recently bought a AMD Raedon 5570, for 59.99 from newegg.com. The 5570 has 1gb of ram, and supports DX11. I can play Crysis 2 and BFBC2 on the highest settings, so im sure it will run those no problem. And my power supply is 280W. But the other componet you need is sufficient ram to run background applications and the applications your using. I would suggest at least 3GBs of ram. Hope i helped :D