Todays it is kinda rare, that someone try CrossFire (AMD cards) versus SLI (nVidia cards) using up to four cards. The reasons are pretty simple - usualy reviewer is happy to get one piece. Having 4 pieces of Fury X and Titan X cards is not very common.
But in the pursuit of fastest graphic power (World records on HWbot are waiting!), people sometimes do even more crazy things that "just" using four of the fastest graphic cards:
You are not dreaming
The results could be demonstrated best on 3DMark Fire Strike test - while using single card (bottom), the Fury X lags a bit to the Titan X (3%, actually). When using 2 cards, then suddently Fury X is neck to neck with Titan X. And the tide turn on 3 crds setup - there Fury X gained good 6% speed up over Titan X and when using the dream setup with four fastest graphic cards todays, then Fury X actually beat Titan X by 9%.
So while this is not enought to make Fury X claim the crown for fastest graphic card today, it is sure proof that on multi GPU setups are AMD Fury X faster that the best nVidia can offer. If we did not take overclocking into the picture, that's also true.
But maybe new drivers (and/or DX12) that let applications use the great resources of Fury X make the card shine…? We see. All the results are there and despite the site is in language most peoples did not understand, the pics and graphs speaks for themselves: http://iyd.kr/753
Hooray for Korea testers!