Thanks for the answers guys.I bought my PC 3 months back and at that time I was almost convinced to go for an nvidia card as usual,because my two previous cards were nvidia and I never had an experience with amd.Also physx in borderlands looks good and a single nvidia GPU,even the 670/680 can't handle advanced physx and graphics alone without performance drops.The 12.11 drivers,3gb frame buffer,384 bit memory bus is what convinced me to take a chance with amd for the first time.I am really happy with the card as I can turn on the AA even at 2560x1440 res and still have good experience.The only game which did not look good on this GPU was borderlands 2,I don't know why and now after switching to a wqhd monitor I wanted to play this game with physx which is only possible with a dedicated nvidia GPU.I was even thinking to get a gtx 650ti only for physx

but that seems way too overkill.Finding a gts 450 is very difficult.I am still on the lookout,my old 9800gtx would have served the purpose,was it not dead