Jesus christ. Is this 2016. It doesn't really matter that Vulkan, DX12 or Metal is based on Mantle or not. Nvidia was also involved heavily in developing DX12 and Vulkan. API itself is much more than that. API can also be used in favor of Nvidia given by the fact that some DX12 games are favoring Nvidia's architecture.
AMD's heavy involvement in current low level APIs are only thing keeping them in a competitive picture at the moment, since they are miles behind Nvidia in terms of perf/mm and perf/w department.
AMD's heavy involvement in current low level APIs are only thing keeping them in a competitive picture at the moment, since they are miles behind Nvidia in terms of perf/mm and perf/w department.