ATX Form Factor, AMD B550 Chipset, Socket AM4, 4 x Dual-Channel DDR4-4400 (OC), 6 x SATA III, 2 x M.2, 1 x PCIe 4.0 x16, 1 x PCIe 3.0 x16 Slots, 2 x PCIe 3.0 x1 Slots, 7.1-Channel HD Audio, Realtek RTL8111H Gigabit LAN Focus on business programs and optimize your workflow with the B550-A PRO ATX Motherboard from MSI. Designed to streamline assembly time MSI allows you to focus on components that will enhance workload efficiency. The B550-A Pro is ideal for the DIY users who wish to replace older out-of-date motherboards or enjoy building from scratch. Based upon AMD B550 chipset architecture the B550-A Pro's AM4 socket allows you to install Ryzen 5000 3000 and Ryzen 4000 G-series processors. Four dual-channel memory slots allow you to take advantage of DDR4 memory modules with speeds up to 4400 MHz. You can connect several hard drives with six SATA III and two M.2 ports for enhanced program loading and increasing overall performance. Install graphics sound or networking cards with one PCIe 4.0 x16 one PCIe 3.0 x16 and two PCIe 3.0 x1 slots. An RJ45 port is also available for wired internet connectivity and with 7.1-channel high-definition audio you can experience a wide range of entertainment. This motherboard is only compatible with Windows 10 64-bit operating systems.