The only practical purpose of such a cluster is educational purposes. Clusters as a whole are only useful for academics and researchers, so once you get into clusters using old hardware you're essentially only building the cluster for the sake of the challenge.
KRAW
joined 1 year ago
AUR is also not supported on Arch, so support has nothing to do with it.
I've had similar issues, but with a 7800XT and only with variable refresh rate enabled. Don't know if that is caused by the same thing though