To avoid problems like this in the future you should probably just pick a side and stick with it. That's what most people do. :shrug:
Hehe...not I. I look at both every time. Then again, I don't believe in brand loyalty. :shrug:
If you get the 6950 then you should put up for the 2gb of v-ram version.
Thats what I got, every game I have played on it gets destroyed. (good thing)
Just about every benchmark I've seen puts the 1GB and 2GB versions of 6950 cards within 1-2 fps of each other at 1080p/1920x1200 and below. I personally would only opt for the 2GB version if it's not much more expensive. :shrug:
Radeon HD 6950 1GB vs. 2GB
Certainly, the first thing we wanted to know is if the reduction memory capacity with the Radeon HD 6950 GPU would cause a reduction in performance. We found that at lower resolutions like 1920x1200 the answer is no, performance was not impacted much if at all. Since both video cards use the same GPU the end-result was the same. Playing at 4X AA at 1920x1200 yielded no performance differences in any of the games.
It was only at the highest setting of 2560x1600 with 8X MSAA did we start to see differences. The 2GB Radeon HD 6950 clearly allowed 8X MSAA in some games to be playable, and in others allowed us to use Transparency Antialiasing at 2560x1600. The 1GB Radeon HD 6950 struggled with these higher settings. Still, in some cases performance was the same as long as the AA setting was lower at 2560x1600.
http://www.hardocp.com/article/2011/02/24/amd_radeon_hd_6950_1gb_performance_review/4