I don't really get it, I can obviously be wrong about this but I've watched a lot of gameplay footage showing off the graphic's card potential and they all ran BF3 on the high settings in a great resolution, and even on ultra, although the latter required them to set the game to a lower resolution, but it actually made a great job. If the performance they got was also a result of a good processor, well I don't see a problem with the one I mentioned.
My point is, judging from what I have seen this card shouldn't have much of a problem running BF3 on High.
...right?