Features: Enhances your computer's capabilities with the PCIExpress 4.0 to Oculink SFF8612 Host Adapter,. Supports PCIe X1 and PCIEX4 slots to extend the function and performances of your computer. Fast speed transmission, strong stability, wide compatibility, easy to use. Computer enthusiasts, gamers, engineers, who need to expand computer functions and performances.Suitable for computers, workstations, servers. Can be used to add gpu cards, networking cards, sound cards and other expansion devices. Specifications: Type: PCIe 4.0 to Oculink SFF8612 Expansion Card Size:about 120X80MM/4.72x3.15in Supports PCIeX1 and PCIEX4 slots Option For SFF8639 Solid Disk External Adapter Package Includes: 1PC PCIe 4.0 to Oculink SFF8612 Expansion Card note: Due to the problem of lighting effect, there is certain tolerances in product, please understand. Please allow 0-1cm error due to the measurement.