What memory capacity and speed does this motherboard support?

It has 4 DDR4 DIMM slots, supports dual-channel memory, and supports up to 128GB of DDR4 memory. The product description also states memory scaling up to 4733+ MHz overclocked.

Does this motherboard support AMD Ryzen 5000 series processors and what socket does it use?

Yes. It supports AMD Ryzen 5000, 5000 G-Series, 4000 G-Series, 3000, and 3000 G-Series desktop processors, and it uses the AM4 socket.

Questions & Answers: ASRock B550M WiFi AM4 AMD B550 Micro ATX Motherboard - Wi-Fi 6E, PCIe 4.0, Hyper M.2 Gen4x4, DDR4 4733+ (OC)

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ASRock B550M WiFi AM4 AMD B550 Micro ATX Motherboard - Wi-Fi 6E, PCIe 4.0, Hyper M.2 Gen4x4, DDR4 4733+ (OC)

AM4 PLATFORM - Supports AMD Ryzen 5000, 5000 G-Series, 4000 G-Series, 3000 and 3000 G-Series desktop processors on the AMD B550 chipset with an 8 power phase design and 2oz copper PCB
HIGH-SPEED MEMORY - 4 x DDR4 DIMM slots with dual channel support, scaling up to 4733+ MHz (OC) for fast, stable performance
NEXT-GEN EXPANSION - 1 x PCIe 4.0 x16 reinforced steel slot plus 1 x Hyper M.2 (PCIe Gen4x4) socket and 4 x SATA3 6Gb/s connectors for flexible storage and graphics
WI-FI 6E CONNECTIVITY - Onboard 802.11axe Wi-Fi 6E with 6GHz band and Bluetooth 5.2, backed by Realtek Gigabit LAN for low-latency wired and wireless networking
IMMERSIVE AUDIO & RGB - Realtek ALC1220 7.1-channel HD audio with Nahimic Audio, dual graphics outputs (HDMI + DisplayPort), and Polychrome RGB headers for custom lighting

$88^.99 –