1, PCIE X16 full bandwidth 4.0, GEN4 protocol, compatible with for gen3/gen4. 2, Support multiple riser card arrays. 3, using high-density low-impedance 4-layer circuit board. 4, using Slim sas8i connector. 5, using PCIE GEN4 connector. with power-on LED indicator. Adopt step-down IC and high-current inductor. Dwarf the PCB design and minimize the size. Support 2-port SFF8654 to convert into a full-bandwidth X16 PCIE. using the graphics card PCIE 6P power supply port. Conditions of use: The motherboard BIOS supports pcie splitting. PCIE GEN4 X16 TO SIimSAS 8i x2 MODES: (x16) (x8x8) (x4x4x8) (x4x4x4x4) Ultra-small size does not take up server space. Support 4 ports, connect 4xnvme solid state hard disk or 4xU2 hard disk. Support to transfer 1 full bandwidth graphics card or two X8 bandwidth graphics cards. Colour:Black Material:ABS Package Contents: 1 set x PCIe4.0x16 slot adapter board