MSI B550-A PRO Motherboard, Socket AM4 to support AMD Ryzen 3rd Generation and future AMD Ryzen processors with BIOS update as MSI Compatibility List on line, AMD B550 chipset, 4 x DDR4 Boost DIMM slots (Dual Channel, up to 128GB) to support 1866/ 2133/ 2400/ 2667/ 2800/ 2933/ 3000/ 3066/ 3200 Mhz (by JEDEC) and 2667/ 2800 /2933 /3000 /3066 /3200 /3466 /3600/ 3733 /3866 /4000 /4133 /4266 /4400+ Mhz (by A-XMP OC MODE), 1 x PCIe 4.0/3.0 x16 slots (PCI_E1 with Steel Armor), 1 x PCIe 3.0 x16 (PCI_E3, supports x4 mode) and 2 x PCIe 3.0 x1 slots, Supports 2-way AMD CrossFire Technology, 6 x SATAIII (6Gb/s) ports, 2 x M.2 slots (Key M): M2_1 slot with M.2 Shield Frozr supports PCIe 4.0/ 3.0x4 and SATA 6Gb/s 2242/ 2260/ 2280/ 22110 SSDs + M2_2 slot supports PCIe 3.0x4 2242/2260/2280 SSDs, 1 x USB3.2 Gen1 Type-C + 2 x USB3.2 Gen1 + 4 x USB2.0 via internal USB connectors, 1 x USB3.2 Gen2 Type-C + 1 x USB3.2 Gen2 + 2 x USB3.2 Gen1 + 4 x USB2.0 on the rear I/O panel, Realtek 8111H Gigabit LAN, Premium Thermal Solution: Extended Heatsink Design with additional choke thermal pad rated for 7W/mk, Powerful Design: Core Boost + Digital PWM IC + 2oz Thickened Copper PCB + Creator Genie, EZ Debug LED, Flash BIOS Button, Audio Boost, MSI Dragon Center, CLICK BIOS 5, Optimized with a dedicated water pump PIN header (PUMP_FAN1) to support Liquid Cooling, Supports Windows 10 64-bit