>> I would be nice if [...] a MorphOS driver for the AMD Radeon SI and RX cards
>> would appear

> I believe some of the HD 7xxx and RX 200 series are supported already

What would have to be supported are HD77xx (GCN1) and newer cards. MorphOS support currently ends with HD76xx (TeraScale 2). The R5 2xx cards currently supported are all TeraScale 2 also. These are not to be confused with the OS4-supported RX 4xx/5xx cards, which are GCN4 (Polaris).