@Ethanol, thanks for your answer. I especially appreciate your comment about power consumption.
I know that the DLN folks are firmly on the side of the Red Team, however my experience make me more hesitant, hence this question.
I don’t have any objection to buy used hardware, however in my local market it is hard to find anything other than NVIDIA graphic cards, so the second hand market is slim to non-existent, and shipping from abroad is prohibitively expensive.
In other news, I did found a LinuxHardware Reddit thread and a Linux Mint thread that suggest that Radion R5 230 is supported by the open-source drivers. Can anybody here verify this?