

My experience with Linux gaming has varied pretty wildly. My old r9 290x could hardly run anything on linux. And if it did, it would run horribly compared to on windows.
Recently I upgraded to an rx 7600, and nearly everything works out of the box or with minor tweaks. And it performs similarly to windows, even better on occasion.
For gaming it is unlikely you will need more than 16, at least not any time soon.