real truth why that and the AMD drivers don't support all there cards yet that are supported that the windows drivers do once they do I'm willing to bet there will be a Linux version they are unless Zcash dies first and NV i see may be supported now hint watch the SA post .
LINUX drivers exist for every AMD card that has a Windows driver - specifically including the entire RX4xx series to date.
AMD *DOES* tend to be a bit behind on releasing drivers for LINUX vs Windows (Windows is the bigger market after all), but they're not normally SEVERAL MONTHS behind any more.