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msi slotLhtning Fast Game experience: PCIe 4.0 slot, Lhtning Gen 4 x4 M.2; Intel Turbo USB 3.2 Gen 2: Powered by Intel USB 3.2 Gen2 controller, Turbo USB ensures an uninterrupted connectionMEG 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