Which is better to run bf3 amd phenom ii x6 1055t plus ati radeon hd 6670 1gb or amd phenom ii x4 945 plus ati radeon hd 6770 1gb

The quad with 6770 is better because of clock speed on both gpu and cpu. It also depends on what resolution and settings you want to play at. Ultra might be choppy while medium and high should be fine. Im using 1055t with 6950 2gb playing at ultra settings on 1080p resolution and 50-70 fps. Hope that helps.