ASUS PRIME B550M-K AMD B550 micro ATX Motherboard (ASUS PRIME B550M-K) - AMD AM4 Socket for AMD Ryzen™ 5000 Series/ 4000 G-Series/ 3000 Series Desktop Processors, Memory: 4 x DIMM, Max. 128GB, DDR4, Expansion Slots: 1 x PCIe 4.0 x16 (x16 mode), 1 x PCIe 3.0 x16 (x16 mode), 2 x PCIe 3.0 x1, Storage: 1xM.2 Socket 3(PCIE 4.0 x4 and SATA modes), 1xM.2 Socket 3(PCIE 3.0 x4 and SATA modes), 4 x SATA 6Gb/s ports, Operating System: Windows 10 64-bit, Form Factor: 9.6 inch x 9.6 inch ( 24.4 cm x 24.4 cm ), Onboard VGA Output Available: 1xD-Sub + 1xDVI-D + 1 x HDMI