Supports AMD AM4 Socket Ryzen™ 3000, 4000 G-Series, 5000 and 5000 G-Series Desktop Processors*; Supports DDR4 4733+ (OC); 1 x PCIe 4.0 x16, 1 x PCIe 3.0 x16, 1 x PCIe 3.0 x1; Graphics Output Options: HDMI; 7.1 CH HD Audio with Content Protection (Realtek ALC1220/ALC1200 Audio Codec), Nahimic Audio; 4 x SATA3, 1 x Hyper M.2 (PCIe Gen4 x4); 8 x USB 3.2 Gen1 (4 x Rear, 4 x Front); 6 x USB 2.0 (2 x Rear, 4 x Front); Realtek Gigabit LAN; Intel 802.11ac WiFi Module + BT 4.2
B550m/ac PCIE lanes distribution : r/ASRock
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ASRock B550M-ITX/ac motherboard
User manual Asrock B550M/ac (English - 90 pages)