I’m still not clear on whether dev-rendering is DXR or RTX.
DXR is a DirectX layer that talks to RTX for you. That’s what Battlefield V uses and it’s smart enough to recompile to work on 10x0 cards.
However in the examples of raytracing in UE it looks like what Epic does is a lot more low level than DXR, but I could be wrong.
RTX is the Nvidia standard I think and DXR is definitely the Microsoft standard. Neither are platform agnostic so I don’t expect long-term support for them in UE, but I don’t know what would replace them. DXR will work right across supported cards on Windows though, whereas RTX will only work on Nvidia cards (I think). Not that there’s any AMD raytracing cards yet that I know of.