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ASRock seems to support new AMD Ryzen 3000 chips for its A320 motherboards
Biostar News ::IPC Manufacturing, Industrial PC Motherboard Manufacturers - BIOSTAR
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MSI B450 TOMAHAWK MAX II Gaming Motherboard (AMD Ryzen 3000 3rd gen ryzen AM4, DDR4, M.2, USB 3.2 Gen 1, HDMI, ATX) - Amazon.com
Can I upgrade my CPU to the Ryzen 7 3700X, and would there be any drawbacks? I'm still somewhat new to computer gaming. (AMD B450) - Quora
AMD bids adieu to socket AM4 by extending Ryzen 5000 Zen 3 support to all 300series AM4 motherboards including the A320 chipset - NotebookCheck.net News
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GIGABYTE AM4 Motherboards: PCIe 4.0 Ready for Ryzen 3000
Ryzen 3000 Review: AMD's 12-core Ryzen 9 3900X conquers its past | PCWorld