Quote Originally Posted by zerazax View Post
If its 255W is a big question. The slides only said > 225W, which can mean anything from 226W up to 300W of course.

That said, the 6850's and 6870s are getting a lot of scaling in CF, so who knows if some hardware changes were made to allow for this. If Cayman is a superset of Barts' features, then the scaling may be there, even with downclocked/cut-down cores.
According to Dave Baumann at B3D there is no changes made to crossfire in Barts and AMD would be stupid if they didn't promote changes that made CF scale better.