PCIE X16 full bandwidth 4.0, GEN4 protocol, compatible with gen3/gen4. Using high-density low-impedance 4-layer circuit board. Dwarf the PCB design and minimize the size. Using SFF8654-8i connector. Support 2-port SFF8654 to convert into a full-bandwidth PCIE X16. Using the graphics card PCIE 6P power supply port. PCIE GEN4 X16 TO SIimSAS 8i x2 MODES: (x16) (x8x8) (x4x4x8) (x4x4x4x4) Ultra-small size does not take up server space. Support to transfer 1 full bandwidth graphics card or two X8 bandwidth graphics cards. Uplink Bus: PCIe x16 Uplink Rate: Gen 4.0 and backward compatible Downlink Ports: SFF8654-8i*2 Port Rate: Gen 4.0 and backward compatible Port Modes: X16, X8X8, X4X4X4X4 Power Supply: PCIe 6-pin Number of Devices: Max. 4 Supported Devices: Graphics card, network card, U.2 SSD Wire Sequence: A-B crossover Operating Temperature: -40 to 85 Storage Temperature: -55 to 105 Storage Humidity: 9% to 95%, non-condensing Color:Black Material:PCB+Metal Package Contents: 1 * 2 Port PCI-E 4.0 X16 to SlimSAS SFF-8654 Adapter Card 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.