PCIE X16 full bandwidth 4.0, GEN4 protocol, compatible with gen3/gen4. The motherboard BI0S needs to support changing the PCIE working mode. Gold finger immersion gold process, increase the gold thickness to 5U. Use Slim sas8i connector. With 1 minute 4 clock split IC. With power-on LED indicator. Dwarf PCB design to minimize the size. Support 2-port 4-port to nvme solid state drives. This product is a accessory, and there is no that all configurations reach Pcie 4.0 and there is no that it be compatible with all motherboards, graphics cards, extension cables, and systems. Note:Due to different production batches, there are differences in printing/appearance, which does not affect use. Colour:Black Material:PCB Package Contents: 2 * adapter card 1 * adapter board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.