WD Ultrastar DC SN640 7.68TB PCIe Gen3.1 x4 U. 2 NVMe 2.5 SSD (WUS4BB076D7P3E3-0TS1930). PCIe Gen3.1 x4 NVMe. Some of the key features of the Western Digital NVMe SSD include. A PCIe Gen3.1×4 interface with a NVMe 1.3c compliant controller, which provides faster data transfer rates and lower latency compared…