Originally Posted by splinterize
I used to have 6850s in crossfire and the performance was about the same that the GTX 580 that I got after. I was not experiencing micro stutter or tearing or whatever. The only annoyance is that older games arent supported (but a single 6870 will max them out so it's not a big deal) and you have to wait a few days/weeks before AMD release a xfire profile when new games comes out.
I'd say go for the 6870s, they are really, really powerful.
For reference, two 6850s where giving me 60-90 fps in BF3 at ultra with the AA at 2x. AA at 4x would give me micro stutter due to the limited VRAM.
^^ This, though I haven't really run into VRAM problems at 2560x1440 myself. Just see for yourself.
And micro-stuttering is real, but it's not that bad. When running around 30 FPS on 2 cards, it may feel more like 24 FPS or so, but above that, it's not a problem.
Waiting for cf profiles can be annoying, but heck, the 6870 isn't that far from 6950 in the first place.