madchemist83 :
First of all from what I've heard that issue is resolved.
There are a lot of people that game with sli or cf without any problems
Second newer 6950s coming out can not be flashed and it's 50/50 plus even flashed it will not perform as 6970 .. true it beats 560ti stock ..but 560ti is smaller, runs cooler and quieter.
The only thing I can see is that it has 2Gb of ram which helps at 1080p
Microstuttering won't be resolved until there is another option other than AFR. There are still flashable (read the reviews of the MSI Twin Frozr II/III) 6950s, and a flashed 6950
IS a 6970. There's absolutely no difference other than the exterior badging. The 2gb 6950 is the Cayman, it's just had disabled shader cores (1536 vs 1408) and lowered texture units (96 vs 88). Paired with an underclock and presto you have a 6950. The Sapphire doesn't even require a flash as it comes stock with 6970 bios, all you have to do is use Sapphires own Trixx OC suite to put it at 6970 speeds.
http://www.tweaktown.com/articles/3762/sapphire_radeon_hd_6950_2gb_unlocked_to_hd_6970/index1.html
As far as people gaming with no problems. This falls into one of two categories. There are people that play games that don't push them under 60 fps, in which case the microstuttering while always existent is difficult to detect. Then there are those people that while they might play under 60fps just aren't bothered by it. Under no circumstances are there 2x cf or sli setups that aren't affected however. It's the very nature of Alternate Frame Rendering.
Good luck with your build.