http://www.fpslabs.com/reviews/video/a-brief-look-at-crossfirex-scaling
The numbers presented in this article should only be interpreted as “a brief look at the state of scaling performance generated by AMD’s current beta CrossFireX driver”. Again, the numbers presented in this article are tentative -by no means are they or should they be interpreted as directly indicative of the performance that CrossFireX will deliver upon its official release.