M.2_1 slot (Key M), type 2242/2260/2280
Only Intel 11th gen processors support PCIe 4.0 x4 mode, this slot will be disabled for other CPUs
M.2_2 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 3.0 x4 & SATA modes)
M.2_3 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 mode)