You also need add the following
r.D3D12.DXR.AllowEmulatedRayTracing=1
into
UE_5.0\Engine\Config\ConsoleVariables.ini
and get the setting right according to documentation.
At lest it work for me.
But there still a problem that is once i start my render in MRQ the GPU will crush.and boom ue editor disapper.
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