btw,
just so you know,
the 6850 at stock oc (ie 820/1100) is running bf3 at 1920x1080 at high on multiplayer with smooth, 40+ fps. Doesn't fall below 40. Roams around 45-48. Touches 55 occasionally. OC makes it hell awesome though.
But ofcouse, some maps are exceptions and drop fps to 35-40.
But certainly playable fps