AMD Ryzen 4000 Zen 3 will be compatible with Socket AM4, but it is end of the road for X470, B450, and below motherboard owners - NotebookCheck.net News
ASRock AMD Ryzen 3000/4000 A520 Chipset Micro ATX Motherboard A520m Pro4 for sale online | eBay
ASRock A520M ITX/ac Supports AMD AM4 Socket Ryzen™ 3000, 4000 G Series and 5000 Supports DDR4|Motherboards| - AliExpress
AMD Ryzen 4000 'Renoir' Desktop APUs Launching on 21st July, Full Lineup Detailed
AMD Will Support Zen 3, Ryzen 4000 CPUs on X470, B450 Motherboards - ExtremeTech
Official announcement of AMD Ryzen 4000 hybrid processors for AM4 platform | Compspice