Benchmarks of Non-Bridge based Crossfire namely xDMA have surfaced for the AMD R9 290X. Just like AMD claimed its just as good as bridge based crossfire.
via N4G: pc news feed http://n4g.com/news/1381547/amd-radeon-r9-290x-xdma-based-crossfire-benchmarks-revealed
via N4G: pc news feed http://n4g.com/news/1381547/amd-radeon-r9-290x-xdma-based-crossfire-benchmarks-revealed