Answer: Shill reporting misinformation... Have a look at Toms 'review' on the 1080:
http://www.tomshardware.co.uk/nvidia...w-33557-5.html and have a look at Pg.3 - quote: "The Ashes charts represent DirectX 12 performance using the game’s built-in benchmark/logging tool. Hitman and Tomb Raider are presented using DirectX 11. However, we have results from DirectX 12 using those games as well, which we’ll mention in the analysis (spoiler: in most cases, performance drops with DirectX 12)"
...and yet to issue those DX12 charts!