AMD & Oxide Confirm Nvidia Don’t Support Asynchronous Compute | Current GPUs Dont Support DX12 - YouTube
Both AMD and NVIDIA support ASync compute/ shaders, with a few differences on hardware level (mostly).
Current generation AMD and NVIDIA high-end gpu cards support various and important dx12 features (like volume tiled resources, conservative raster and async compute), up to 12.1 level, again with some differences between AMD and NVIDIA on what is offered. How good is offered is something to consider when dx12 games and apps start to mature.
But no current card has full dx12 feature support. The next generation will probably be marketed specifically for that and actually deliver on the promise.
Take a look at this:
Demystifying DirectX 12 support in Windows 10: What AMD, Intel, and Nvidia do and don’t deliver | ExtremeTech
I expect to see some material DX12 support next year when the 14nm gear start to come to market
It is still too early to start making any conclusive comparisons, start fanboy wars or think about upgrading (if current dx12 gpus are already used).
Dx11 will still be widely used for a long time, and actually be preferable, unless dx12 api start making better use of current and future hardware by a considerable margin. Mantle, if anything, has left us all with great hunger, that's for sure !
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