ASUS PRIME B450M-A II AM4 Micro-ATX Motherboard, Storage 1x M.2 slots & 6x SATA 6Gb/s ports, Expansion Slots 1x PCIe 3.0 x16, 2x PCIe 2.0 x1, Connectivity Realtek RTL8111H Ethernet, Rear USB Ports 2x USB-A 3.2 Gen2, 4x USB-A 3.2 Gen1, Chipset B450, Socket AMD AM4, Form Factor Micro-ATX, RAM Support 4x DDR4 Slots (Dual Channel), 10/100/1000Mbps. ASUS Prime B450M II Series motherboards provide the solid foundation needed for your first build, plus flexibility to grow with your ambitions. We've melded all the good stuff that's packed into AMD Ryzen™ processors.