The AMD Radeon R9 290X performance results in both Uber and CrossFireX mode have been leaked by Chinese forums. AMD recently allowed tech sites to post 4K performance previews of two games which included Tomb Raider and Bioshock Infinite however some sites went ahead and leaked the entire 4K performance presentation that wasnt supposed to go live until the NDA was over on the Hawaii GPU.
via N4G: pc news feed http://n4g.com/news/1376541/amd-radeon-r9-290x-uber-mode-and-crossfirex-performance-leaked
via N4G: pc news feed http://n4g.com/news/1376541/amd-radeon-r9-290x-uber-mode-and-crossfirex-performance-leaked