msi slotMSI MS-6119 SLOT1 440BX ATX Motherboard with 128MB Memory, NO CPU or IO Plate.MEG B550 Unify and Unify-X offer four M.2 slots and three of them support PCIe 4.0 x4 to max out the performance PCIe 4.0 SSDs. The first M.2 slot (labeled as M2_1) is