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 connect 4 nvme solid state drives. This product is a third-party accessory, and there is no guarantee that all configurations will reach Pcie 4.0 and there is no guarantee that it will 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.