Running with 3 screen 5760*1080 in BF3, low settings

[sehested]

and i still have low framerate, just about 30fps

my rig are:
CPU:AMD Phenom II X4 965
Board: Gigabyte GA-890GPA-UD3H
Memory: Corsair Vengeance LP 8GB
GFX: ATI 6970 2gb

i would like to play a bit over low settings with average fps
if i buy one more GXF and run Crossfire, u guys think that would do enough for me ? or is the only way, all new hardware or better GFX. ??

Merry Xmas all