My question is Radeon VII crossfire,
currently crossfire does not work in Dx11 it will be supported in later period.
My guess is that Vega 20 doesn't differ much from Vega 10(Vega64), so the profiles might work.
AMD Crossfire will work with DX9/10/11 applications using two or more AMD GPUs, but it is not Supported on Radeon VII
You can have the similar crossfire function with the MGPU, but it will work with only DX12/Vulkan applications using two or more GPUs (can be AMD or Nvidia if the developer has firstly enabled MGPU support) this is Supported on Radeon VII but reliant on the game developer to implement.
To be perfectly clear what you said here is the most important part " (can be AMD or Nvidia if the developer has firstly enabled MGPU support) ". MGPU in DX12 it is a DX12 software feature. AMD nor NVIDIA control whether it is supported or not, it is completely on the game developer to adopt. As it looks now not many are choosing to do so. I have seen statistics in the past of not even 5-10% of gamers even use more than one GPU so most find it not worth supporting anymore. Crossfire and SLI have been very poorly supported in the past couple years for the same reason under DX11.
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