If BF4 Mantle has the same graphics as BF4 DX11, then 17% or even 10% faster in the highest-end configuration Ultra setting is huge: it may not be a game changer for the players, but seeing how GPU benchmarks results are judged by the slightest percentage differences, this can mean a major win for AMD in many cases.
I think Mantle is a really big deal just for that. The even better lower-end performance improvements are just gravy.
I think Mantle is a really big deal just for that. The even better lower-end performance improvements are just gravy.