Function: 1. Best solution: Connect two 2,5-inch PCIe NVMe U.2 (SFF8639) do PCIe x8 slots on your system using SFF8643 cables (not included). It allows you to install two 2,5-inch PCIe NVMe U.2 SSDs on your PC system via a PCIe 3.0 x8 card. 2. Parameter: Two mini SAS HD SFF 8643 connectors (support for the split function by shit query is required, only 1 interface is not supported). Interface: PCIE X8 do dual port SFF 8643. Hardware requirements: PCIe 3.0 x4/x8/x16, backward compatible with PCIe 2.0/1.0. 3. Bandwidth: The use of sophisticated manufacturing techniques to support a maximum bandwidth of 32 Gb/s in PCIe 3.0. 4. Support system: support Windows2000, XP, Server2003, XP 64bit, Vista, Win7, Linux, DOS, OS X. 5. Easy to install, no drivers required. Specification: Item Type: PCIE X8 to U.2 Adapter Card Matter: PCB Interface Type: PCIE X8 Applies to models: conventional desktop computer Expansion Interface: Dual Port Mini-SAS HD (SFF 8643, 36-pin), female Support system: for Windows2000, for XP, for Server 2003, for XP 64bit, for Vista, for win7, for linux, for DOS, for OS X Hardware requirements: PCIE 3.0 x8/x16, backward compatibility with PCIE 2.0/1.0 List of packages: 1 x PCIE X8 to U.2 1 adapter card x thin bracket