The 6950 is not really anywhere near powerful enough to run the most demanding games at high settings on triple monitor resolutions. You'll be able to play things, just expect to turn settings down pretty substantially on demanding games.
See the link above. In the time it took you to post this and wait for a response, you could have found out for yourself.
I was just in a rush when I posted this, did not have time to actually look up, but after having a chance to look at that link, it sounds much better than i thought, i did not think it was better than the 560ti either.
Also, That is a pretty cool feature about the Eyefinity where you can just turn it on or off, i though you would have had to go into the setting and reconfigure it every time. Im not sure if i am every going to have triple monitors, but i want to have the ability to if down the road i decide i want to.