My PowerColor Fighter RX6600 works completely fine on Ubuntu 22.04. No stability issues at all, and even ROCm works. The GPU itself supports 5 simultaneous displays but the card has only 4 outputs: 3 DP 1.4a and 1 HDMI 2.1
Well, I’m saying it may not perform for workstation workloads as well as nvidia cards, because cuda, but I also dont know how well supported workstation/pro features are with nvidia cards on Linux.