About this item PCIe NVMe U. 2 (SFF-8639) Drive to M. 2 Host Adapter U. 2 to M. 2 cable for data and power delivery to U. 2/ 2.5 PCIe devices Supports drives that require 12V source. Requires external PSU SATA power connector. 18 for flexibility of mounting U. 2/ 2.5 drives in drive bays.