I'm running BAMT on one computer with cgminer 2.11.4 and catalyst 11.6.  I had this 7950 gpu in my other computer originally running cgminer 3.1.1 and catalyst 13.4.  I saw no difference in hash rate when I moved the card to the second computer.

That is just my experience though and I haven't played around much with different drivers and cgminer versions.