Tweaktown recently put Hitman through its paces in both APIs. In 1080p DirectX 11, Nvidia wins top overall honors with the Titan X squeezing out the Fury X. Switch to DirectX 12, however, and AMD’s Fury X pulls ahead. The gap between the AMD and Nvidia cards continues to widen as the resolution rises; AMD wins 4K in both DX11 and DX12 and the gap in 4K DX12 is large enough that the R9 390X is able to surpass the GTX Titan X, as shown below:
ARTICLE > Early DirectX 12 games show a distinct split between AMD, Nvidia performance | ExtremeTech
It will be interesting to see how this generation of cards from both AMD and nVidia handle content in excess of 2560x1600. Honestly you have to say that with UHD monitors quickly having inexpensive variants, such as the $350 FreeSync compatible AOC U2879VF 28" 4K Widescreen LCD gaming Monitor, which is about the same price I paid 4 years ago for my 1920x1200 HP ZR2440w, and decent 1920x1080 monitors going for $90 or less, such as the LG 22MC57HQ-P, making an Eyefinity 3840x1080 arrangement well under $200 possible, we're going to need to see the $200 mid-range cards be able to push UHD at a minimum of 30fps with little need to reduce detail levels, such as AA.
Capturing the high end is great, but what's the point of winning the top 10% if your competition wins the bottom 90%?