Asus HYPER M.2 X16 Gen 4 Card Interface: PCIE 4.0 / 3.0 x16, Compatible with pcie x8 and x16 slots, supports data transfer rates up to 256Gbps External connectors: up to 4 m.2 slots (m-key), type 2242/2260/2280/22110 (supports pcie 4.0 / 3.0) only supports pcie m.2 storage devices. Maximum support of ssd may vary, depending on different motherboard design. Led and button 1 x m.2 fan power switch 4 m.2 access LED Features: AMD TRX40 / X570 series motherboard models with support pcie 4.0 supports pcie 3.0 bandwidth for other raid models on cpu. The maximum number of m.2 ssd media will vary, depending on different CPU specifications and pcie bifurcation settings in different ASUS motherboards. Please see faq link for full compatible lists and more information: https://www.asus.com/support/faq/1037507.