6 x SATA III 4 x M.2 M.2_1 (2280) - PCIe 5.0 x4* M.2_2 (2280) - PCIe 4.0 x4* M.2_3 (2280) - PCIe 4.0 x4* M.2_4 (2280) - PCIe 4.0 x4* * M2_1 is the first priority for M.2 installation. * M2_1 will r