Yes you should be able to add 100mhz easily to that card. A 150mhz bump would also be worth trying.Going back to some of the comments made about the 7950, I got one of the XFX overclocked models just before the 680 came out. This one specifically.
Can i get any more out of it than what XFX clocked it at? I hadn't even considered Nvidia when i was looking for cards. I generally do just go by brands i've had success with.
If it's hit its wall with overclocking, i'll probably chalk it up as a loss for not waiting for a price drop, but if i can get more out of it, i'll go for it.