My setup started similar to yours. Asus x570 motherboard with an AMD 3800x processor set for 4.0Ghz and 32GB ram. I had an nvidia 3070ti card which did work for me running the current Kubuntu LTS. Just had to make sure I always had the latest driver release from nvidia. Running games through Steam worked fine, but shader caching would take 20 minutes if I didn't just skip it. Games had some terrible shadows at times which I could never fix no matter what settings I turned off or reduced. Bought a PowerColor 9070xt card last month (and a bigger power supply to make sure there was enough juice to run everything). Popped it in and performance has been sooo much better! I was expecting there to be issues, but the system posted fine and came right up like normal. Shading issues are gone, games look far better (water actually looks watery and has ripples), shader caching dropped to 10 or 20 seconds. And I haven't had my system become hung up once since the switch. Friends and I have played Enshrouded, Valheim, and Ark Survival Ascended recently, and been playing a bit of Skyrim for fun too. All have run smoother, look better, and my system has been more stable.. Overall it was worth it for me to get a 9070xt card.