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. PCI-E 4.0 X16 to SIimSAS 8i Adapter Card,PCIe 4.0 16X To SlimSAS Adapter Card,PCI-E 4.0 X16 to SIimSAS Adapter Card,PCI-E 4.0 X16 to SFF-8654 Adapter Card,Graphics Card External Expansion. 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 Speed: Gen 4.0 and Backward Compatible Downstream Ports: SFF8654-8i x 2 Port Speed: Gen 4.0 and Backward Compatible Port Modes: X16, X8X8, X4X4X4X4 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: As Shown Material: PCB Package Contents: 1 x PCIe4.0 16X To SlimSAS Adapter Card 1 x SlimSAS4.0 Cable 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.