The Tech Report published a review on the Here's a first look at the Radeon R9 Fury X's performance
A quote from the article:
If you're wondering how AMD's Radeon R9 Fury X stacks up against Nvidia's GeForce GTX 980 Ti, we have a treat for you. We have some average FPS numbers for both cards running a variety of popular games at 4K, and the results are surprising.Here's a first look at the Radeon R9 Fury X's performance @ The Tech Report