According to FUD Zilla the upcoming ATI R680 will be faster than the GeForce 8800 Ultra. Hopefully for ATI it is, it would be kinda pathetic if even a dual-GPU chip couldn't defeat a GPU that's been on the market for about half a year.
R680 is made of two RV670 chips on a single PCB and it will act as Crossfire on a single board. ATI tried this before, but at launch time, drivers will finally be there.
ATI has to be sure that dozens if not hundreds of games take benefit of two GPUs all the time, as if this doesn’t happen R680 might be as slow as RV670PRO in that particular game.
That is one tough task but before R700 comes in game, ATI will keep trying.