Built-in dual GPU's don't exhibit micro-stutter. So, in the case of the 6990 and the like, no. Crossfire performance is still expected to increase, however. As a dual 6870 user, this is LONG overdue.
wrong, dual gpu cards do experience micro-stutter exactly the same as 2 separate cards do. So in the case of the 6990, yes it does have micro-stutter. As a former 6850 crossfire user i'm so glad i sold them a month after i got the second one, would have had to wait all this time for a "maybe" fix, even now i have my doubts as this has been noted since they first introduced crossfire. Will not buy another one of their cards. Nvidia seem to be very prompt to fix any issues with their drivers, although there are rarely any problems with them.