Specification: Origin: Mainland China Type: Add On Cards Interface Type: PCI Express Package: Yes Support for hard disk: U2 SSD expansion Interface speed: PCIE3.0X4 interface, supporting GEN3 speed Maximum transmission speed: read and write speeds up to 4000Mb/s Compatibility: No driver required, compatible with multiple operating systems, including for Windows series, for MacOS, and for Linux systems Materials: Made of high-quality materials to ensure stability and reliability Product size: 120.00x120.00x32.00mm Product size: 4.72x4.72x1.26inch Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x U.2 SFF-8639 To PCI-EX4 Expansion Card Superior Heat Dissipation: Our adapter card features an excellent heat dissipation design with a hollowed-out structure, ensuring stable operation over wide temperature ranges. This design ensures the adapter card's stability and reliability while providing superior hardware protection. Wide Compatibility: Our SFF-8639 PCIe Adapter is compatible with X4, X8, and X16 slot motherboards with a PCI-E interface, enabling high-speed storage connection and expansion on both new and old motherboards. Install it conveniently in the suitable slot for your motherboard. Multi-System Compatibility: Our U.2 to PCIe Adapter Riser doesn't require driver installations and is compatible with various operating systems, including for Windows,for MacOS, and for Linux. It offers the flexibility to use it across different system environments, facilitating high-speed storage convenience. Stable Connection: Our PCI-E Expansion Adapter Card Riser Card ensures robust and stable connections with its thickened gold-plated design at the interface with the motherboard. This reduces the chance of hard drive failures and eliminates worries about unstable connections or disconnections. High-Speed Transmission: Experience the full potential of your U.2 hard drives with our U.2 SFF-8639 To PCI-EX4 Expansion Card. It boasts a PCIE3.0X4 interface with GEN3 speed, delivering read-write transmission speeds of up to 4000Mb/s. By enhancing your system's performance, it delivers a high-speed data transmission experience.