ASUS PRIME B550M-A AMD B550 micro ATX Motherboard (ASUS PRIME B550M-A) - Memory: 4x Dual Channel DDR4 DIMM Slot, Max. 128GB, DDR4 4600MHz , Expansion Slots:1xPCIe 4.0 x16(x16 mode), 2xPCIe 3.0 x1, 4 x SATA 6Gb/s ports, 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