I have an Nvidia RTX 3070 and it works fine in kubuntu.
One of the latest games I played where I used HDR and ray tracing was Ghostrunner. It worked fine but with some intermittent slow downs.
I also have an AMD processor and that works great. You get a lot more bang for your buck.
You'll be fine. Although if you ever change, go with an ATI Radeon card for graphics because it's better supported by Linux and will have less potential problems.