QNAP QDA-UMP4 ,M.2 NVMe SSD to U.2 NVMe PCIe Gen4 adapterUse an M. 2 PCIe NVMe SSD in a U. 2 PCIe NVMe SSD drive bay for PC and NAS The QDA UMP4 allows installing an M. 2 PCIe 4. 0 x4 NVMe SSD in a 2. 5 inch U. 2 (SFF 8639) PCIe 4. 0 x4 NVMe SSD drive bay. No extra software or drivers are required for the QDA UMP4 and it can be installed in a PC workstation (Windows, Linux) or QNAP NAS to enable using M. 2 SSDs as cost effective alternatives to expensive U. 2 SSDs. 1 Use an M. 2 2280 (M key) PCIe NVMe SSD