63 fps average, meaning most of the time, it is 63 fps, so to quote a low, which could have been, and likely to have been, as brief as a fraction of a second doesn't really constitute it being unplayable or bad performance. I play full settings with my GTX 260 in most games, granted, at lower resolution, and sometimes it drops to 35-40 fps but it doesn't impact the experience or the game, because the majority of the time, I don't notice anyway and neither do most other people.
You can quote facts and figures all day, but when I play a game, I don't look at the numbers, and I don't benchmark every time I play. I look at the game, if things are going bad performance wise, knock the settings down (don't notice the settings change 99% of the time unless it is from highest to lowest) and it is still the same. I am a human, not a computer, and when a GTX260, a card that by today's standards is a slug can play every single game and barely break a sweat, and not show it's age to me or anyone else, the people sat behind the monitors and to who it matters, because it doesn't matter diddly squat to the computer, clearly a 6950 is plenty.
Go and ask someone who has one or who has used one if they are disappointed with the performance, even someone playing as 1200, and I would put a large bet on that they say they are not, and it is that which proves that benchmarks, for the most part, are about as much use as a chocolate kettle