Ryzen 4000 CPUs will only be compatible with the 500 series motherbaords, confirms AMD
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ASUS AMD B450 Equipped Am4 Compatible Motherboard Prime B450m-a MicroATX Com for sale online | eBay
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How To Find Out Which CPU is compatible With Your Motherboard
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AMD Confirms Ryzen 4000 'Zen 3' Desktop CPU Compatibility With X570 & B550 Motherboards – No Plans T | Page 16 | guru3D Forums
AMD's X570 chipset won't support first-generation Ryzen | TechSpot