Hello, I have AMD Phenom 9550 2.2ghz, 8MB DDR2 800MHz, Win 7 64bit, DX 11, 1600 X 900 resolution, Radeon HD 4850, ASUS M3A78-EMH HDMI Mobo.850PSU unit. I would like to upgrade my video card to DX 11 and play BF3, what kind of video card could I get that would perform ok with my current PC. I was looking at purchasing a Radeon HD 6790.