I think that's where I am confused by your question. Ray tracing is a rendering technique and RTX is Nvidia's brand name for the technique. The RTX brand name is also used as classification for Nvidia's graphic card line(s). Ray tracing is not limited to Nvidia's graphics cards.
en.wikipedia.org
Unreal Engine 4 and Unreal Engine 5 support ray tracing with UE5 supporting the new Lumen global illumination solution.
Given that it will be easy for SV to transition to UE5 as they are currently on UE 4.26, it should be easy for them to implement Lumen and hopefully Nanite.
Join the Unreal Engine team as they take a look underneath the hood to explore how Nanite was used in the sample project “Valley of the Ancient"
www.unrealengine.com
Additional Information...
en.wikipedia.org
en.wikipedia.org