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AMD Ryzen 4000 Vermeer will support the B450 chipset
ASRock > Fatal1ty B450 Gaming-ITX/ac
AMD Zen 3, Ryzen 4000-series CPUs will work on B450, X470 motherboards - ThinkComputers.org
ASUS Announces UEFI BIOS Support for AMD Ryzen 7 5800X3D and new AMD Ryzen 5000 Series and 4000 Series CPUs for ASUS AM4 X570, B550, X470, B450, X370, motherboards* 83 motherboards listed
ASRock > B450 Steel Legend
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AMD Reverses Course, Will Enable Zen 3 and Ryzen 4000 Support on B450 and X470 Motherboards | Tom's Hardware
MSI are ready to support Ryzen 5000/4000 series processors for AMD 500, 400, and 300-series Motherboards
Here's Why the B450 Motherboards Won't Support AMD's Ryzen 4000 Processors | Hardware Times