Well, at least to these leaked slides that just surfaced on the web. The tests are posted by Korean tech publication ITCM.co.kr. R9 Fury X score higher than the GTX Titan X in all three tests, while the R9 Fury is almost as fast as the GTX 980 Ti.
These benchmarks should be taken with a huge grain of salt of course, I think they are artificially calculated. I say so as the name in the charts seem to refer to DG Lee, famous for posting 'guestimated' results on the web claiming they are real. But hey .. have a peek and obviously as always, draw your own conclusions.
Source: ITCM (Korea)