1, oculink external device, support devices with oculink port to expand PCIE card. 2, support small host with oculink port, GDP handheld game console, laptop to expand external PCIE card. 3,Support external GPU graphics card, PCIE network card, PCIE sound card, PCIE capture card, NVME/U.2/U.3 SSD, etc.. 4, Maximum bandwidth speed is PCIE 4.0 X4 GEN4, 64G. backward compatible with GEN3. 5, Support ATX/SFX/Small 1U power supply, the adapter board only needs to be plugged into the 24P power supply, the graphics card is powered by the power supply. Power supply should be 500W and above. support to follow the host synchronous start, synchronous stop, does not support hot-swap. the external GPU graphics card can support up to 4090, the maximum performance of 95%. only supports 2-slot graphics card, metal box limits the length of the graphics card 24cm, limit the thickness of 44cm. this box does not support the built-in power supply. Colour:As Shown Material:PC+ galvanized sheet Package Contents: 1 x Graphics Card GPU Holder Dock Kit(Due to different product batches, the appearance , which does not affect the use) 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.