I have an Asrock DESKMINI A300 with a Ryzen 5 3400g. I noticed that there is the newer Asrock DESKMINI X300 that supports Ryzen 4000 APUs and even looks better IMO. I
Asrock DeskMini X300 with AMD Ryzen 7 5700G : r/MiniPCs
Asrock Deskmini X300 Cases And Motherboard + Ryzen 5 Pro 4650g R5 Pro 4650g Cpu Suit [ Without (ssd / Rams) ] Nb-rams Socket Am4 - Motherboards - AliExpress
ASRock DeskMini X300 and A300 mini PC barebones first to support up to an AMD Ryzen 7 Pro 4750G APU - NotebookCheck.net News
ASRock DeskMini A300 4750G 120W (8GB 램/128GB M.2 NVMe SSD) AMD Ryzen 7 Pro 4750G 장착 초소형 미니PC-11번가 모바일
Motherboard - Group Buy/Crowdfunded Modded BIOS for the Asrock A300m (Deskmini A300) | SFF.Network