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Asrock B550 Extreme4 Supports 3Rd Gen Amd Am4 RyzenForged with aluminum alloy heatsinnk top cover that effectively improves heat dissipation Underneath its solid strong cover lie two gaming required M2 Key M sockets for high speed SSDs Hyper M2 socket that supports PcIe gen4 x4 while Ultra M2 socket is capable of running PcIe gen3 x2 and SATA3 mode..