Features: PCIe 3.0 and 4.0 provide higher bandwidth and speed for faster and more stable data transfer. Expandability: With the x8 adapter card, you can add more PCIe slots in a 1U chassis to support more expansion cards such as networking cards, GPU cards or storage controllers. Wide applicability: x8 adapters are often compatibles different types of PCIe devices, which makes the 1U chassis flexible and can meet the needs of various application scenario. Reduced Costs: With x8 adapters, you can fully utilize the space in a 1U chassis, avoiding the need to purchase a larger chassisto accommodate more devices, thus reducing overall costs. Easy to install: These adapters are typically easy to install and configure, allowing you to quickly add additional PCIe slots to a 1U chassis to boost performances Specifications: Type:PCIe 3.0 4.0x8 to 2 NVMe M.2 NGFF SSD Adapter Card For 1U Chassis Size:about 149x30mm/5.86x1.18in Package Includes: 1PC PCIex8 to 2 NVMe M.2 NGFF SSD Adapter Card note: Due to the problems of lighting effects there will be tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurement