Total War: Warhammer is one game, so people shouldn't base their hardware purchases solely on how it performs. It's another example of a game with low-level API support where AMD sees gains while Nvidia performance drops, but it's also in the same category as Ashes of the Singularity and Hitman—namely, it's promoted by AMD and sports their logo. If you focus on only DX12 or DX11 performance, the GPU standings change quite a bit, but once you select the best API for each GPU, things are basically back to 'normal.'