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At a glance
Asus PRIME B550M-A/CSM is a Micro ATX motherboard for AM4 processors, with DDR4 memory support. It is listed at one UK shop, AWD-IT, for £113.99 (checked 19 October 2026).
From the retailer
AMD B550 (Ryzen AM4) micro ATX motherboard with dual M.2, PCIe 4.0, 1 Gb Ethernet, HDMI/D-Sub/DVI, SATA 6 Gbps, USB 3.2 Gen 2 Type-A, and Aura Sync RGB headers support
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