bhuto3000 :
Bt even at 720p am not getting gud fps in ultra settings.....i dont think 7790 is dat bad a card?????
It's not that bad. BF3 is just a bit more intense than some other games that it can probably run well.
Try OCing a bit, run FRAPS and see if your FPS increases.
Edit: Overclock the VRAM more than the core clock. It's probably the VRAM not keeping up. You can try both. See which one provides better performance.