Features: 2 SFF8639 to PCIe 4.0 X8 Adapter: By installing SSD on this PCIe 4.0 X8 adapter, your computer will be able to access SFF8639 SSD at the same time. Hardware Platform: Support Soft platform, not support 5.1 (Note: to set up (VROC), you need to purchase your license). Set the PCIe Bifurcation of the corresponding PCIe slot, support X4X4X4X4 or X4X4X8 or M.2 X16 (Note: Can not support X8X4X4 ). Important: Because this adapter not support PCIe Bifurcation, it requires a motherboards that supports PCIe Bifurcation. Otherwise, only the Port-1 port can recognize the SSD. Before purchasing, please check the PCIe expansion slot part of the motherboards manual on the motherboards manufacturer's website, or consult us directly. to reach PCIe 4.0X4 (64Gbps) full speed, the CPU and motherboards PCIe slot and PCIe M.2 SSD should all be PCIe 4.0 features (Note: PCIe 4.0 is not supported on CPUs 11th generation). Support OS Booting: Reinstall the OS, and set up UEFI boot from this SSD (Note: Some motherboards are too old to support booting. In this case, SSD can be used as storage disks). OS compatibility: Win 11/10/8(Note: Not support Win 7). The new SSD needs to be initialized and formatted before it can be recognized by the computer host. Specifications: Material: PCB Package Includes: 1PC SFF8639 to PCIe 8x Adapter 1PC long metal bracket 1PC screw kit note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.