Features: 1.Wide Compatibility: This PCI?e 4x to u.2 SFF?8639 expansion card is compatible with ordinary SATA hard disk. 2.For 2.5in SSD: This PCI?e 4x to u.2 SFF?8639 expansion card is used for 2.5in SSD or mechanical hard disk. It has PCIE, SATA, SAS signal. 3.High Speed: This PCI?e 4x to u.2 SFF?8639 expansion card adopts SpeedPlus.Link high speed signal reinforced technology for stable and faster transmission. 4.Low Delay: The U.2 interface supports NMe standard protocol, low delay and low power consumption. 5.Note: The mainboard that does not support NVMe cannot serve as a system disk but only as a storage disk. specification:Item Type: U.2 to Pcie Adapter Material: Printed circuit board Interface: PCI-E 4X Power Port: SATA 3.0 Hard Disk: 2.5in SSD Supported System: Suitable for Win 7, for Win 8, for Win 10, for OS X, for Linux. PackageList:1 x U.2 to Pcie Adapter 1 x SATA Cable 4 x Screws