ASUS PRIME B550M-K AM4 Micro-ATX Motherboard, 2x PCIe 3.0 x1, Storage 2x M.2 Socket 3 & 4x SATA 6Gb/s Connectors, Network Realtek RTL8111H 1Gb Ethernet, Realtek ALC887 7.1 Surround Sound High Definition Audio CODEC, Rear USB Ports 2x USB-A 3.2 Gen 2 & 4x USB-A 3.2 Gen 1, Memory 4x DDR4 DIMM Slots (128GB, 4400 MHz O.C), Expansion Slots 1x PCIe 4.0 x16. ASUS Prime series is expertly engineered to unleash the full potential of 3rd Generation AMD Ryzen platform. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options.