Can Any 6950 Still Be Unlocked

I have been debating on getting either a 6950 or a GTX 560 ti, since they have similar price points and performance; however, I would feel more inclined to grab a 6950 if they are still unlockable to a 6970 specs. I remember when they were released they were all able to do so, but I wasn't 100% sure if they have been fixed since then to stop this modification.Also, I'd like someone's unbiased opinion on the 6950 versus Nvidia's counterpart. I'm trying not to spend any more than 250. Lastly, should I just go for the 2gb card? I someday want to go to eyefinity since I'm only 1 monitor away. And eventually I'll get another matching card, most likely when they're less than 200.