1.This adapter card only supports the solid-state hard disk of PCIE X4 transport protocol in the M.2 NGFF interface (there is only one gap in the solid-state hard disk) and the solid-state hard disk of PCIE X2 transport protocol (this kind of solid-state hard disk has two interfaces, but the transport protocol is PCIE X2,Please be sure to distinguish between the two gaps also have SATA transport protocol, please be sure to consult your official solid-state hard disk customer service, understand the hard disk transmission protocol, buy the wrong is not used. 2.This transfer card converts the M.2 NGFF solid-state hard disk of PCIe X4 or PCIe X2 interface protocol into the PCIE X1 interface on the desktop motherboard. It is mainly used for batch test firmware upgrade of solid-state hard disk or emergency use when some motherboards have insufficient PCIe X4 interface.The SSD with this adapter card can't run at full speed! Insert the PCIE 3.0c slot of the motherboard as far as possible. If you insert the PCIE 2.0 or PCIE 1.0 slot, the speed is very slow! 3.This product is PCIE X4 3.0 or PCIE X8 3.0 or PCIE X16 3.0 slot inserted into the motherboard, that is, the graphics card slot of the motherboard, do not incorrectly insert the PCI slot, the slot may burn the motherboard, adapter card and your solid-state hard disk! 4.Windows 7 can't recognize NVME protocol solid-state hard disk! Include: 1 x NVMe PCIe M.2 NGFF SSD to PCIe x1 adapter card,1 x Half height bracket with screws _x000D_ _x000D_ _x000D_