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Check your Asus or MSI motherboard's AMD Ryzen 3000 compatibility here
AMD's impressive progress continues with the new Ryzen 3000
Msi A520m-a Pro Amd Am4 M-atx Pc Desktop Motherboard With Amd Am4 Zen 3, Ddr4, Pcie 3.0, M.2, Sata 6gb/s, USB 3.2, Hdmi/dvi, Compatible With Ryzen 5000& 4000g Series & 3000 Series
B550-A PRO
Amazon.com: MAXSUN Motherboard B550 Terminator Gaming M-ATX PC Motherboard AMD AM4 Zen 3, DDR4, PCIe 4.0, M.2, SATA 6Gb/s, USB 3.2 HDMI/VGA, Micro ATX AMD for Ryzen 5000 & 3000 Series Processors :
Best Motherboard for AMD Ryzen 5000 Series | ASUS X570 & B550
Amazon.com: MSI X570-A PRO Motherboard (AMD AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI, ATX) : Electronics
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Will Ryzen 5000 be compatible on a Ryzen 3000 motherboard? - Quora
MSI A520M-A PRO Motherboard (AMD Ryzen 3000 3rd Gen AM4, DDR4, M.2, USB 3.2 Gen 1, HDMI, Micro ATX)
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Biostar publishes list of 3rd Gen Ryzen-compatible motherboards and reveals "AMD Ryzen 3000 Desktop Ready" logo in the process - NotebookCheck.net News