When nvidia wins in benchmarks, accusations of "nvidia biased" fly out of the woodwork like fireworks on the 4th of july.Love it how everything is "unbiased" when NVIDIA is winning, but when AMD humiliates NVIDIA in equally unbiased DX12 and Vulkan titles with 1 generation old flagship, it's somehow "biased". Hilarious. Nothing is biased, AMD is just better in DX12 and Vulkan and that is a fact as solid and real as gravity itself. And it has been known for as long as Mantle existed and for as long as AMD was pushing for this closer to the metal API system. And it's GeForce owner telling you all this. So, do your math.
in games that are not sponsored by nvidia or AMD, AMD does not have much of a lead from DX12. It benefits more, but that doesnt fix a slow card, and nvidiai still ends up on top of the graph.
Doom with vulkan is the exception to this rule, but that just exposes the other ugly truth. With DX12/vulkan, games will favor either nvidia or AMD based on which developer is making said game, just like with DX11. DX12 as a blanket statement is not going to be a home run consistently for AMD, especially if nvidia continues to dominate the PC space.
And at this point, there are simply no full DX12 games out, just a bunch of dx11 games with a dx12 wrapper on them. It will take some time until true DX12 games are out, and by then both the 400 series and the 1000 series will be irrelevant.