I don't think you will see much of a performance boost with that card:(
Do you think you could stretch to an AMD HD 7750 2048MB?
I am not much of a gamer, but I like to game occasionally. My 7470 really limits me. I want to be able to play games fluently, not current games, but games like BF3, FC3, I heard the GT 630 can really play anything. I just want to know if anything will hold me back.