The 6950 is a beast, it can handle both Crysis and Metro 2033 maxed out with 45-55 fps, but not 60.
But with full AA, and 1600x900, you may see some hiccups. At 1600x900 even 2x AA is enough and if you want full 60 fps smooth gameplay, then I would suggest you to overclock it a little bit.
For...