4 x SATA III 3 x M.2 M.2_1 (2280) - PCIe 5.0 x4* M.2_2 (2230/2242/2260/2280) - PCIe 4.0 x4* M.2_3 (2280) - SATA & PCIe 3.0 x4* * M2_1 is the first priority for M.2 installation. * M2_1 will run at