Hi, ThanksHello and Welcome. The integrated Vega GPU doesn't work on macOS I'm afraid and the G series of Ryzen have an audio issue. Although it is possible if you add a discrete GPU.
Regarding Polaris, basically every model of card is supported as long as it’s running either a Polaris or Baffin core(lower end cards like the RX550 run a Lexa core meaning no support in macOS).
I did not know that.Regarding the RX 550
As for the 1650. It's a Turing based card and was never supported in macOS.
Hi,If the 550 is a Lexa core model it won't work.