U.2 (SFF-8639) ↔ PCIe x1

U.2 (SFF-8639) to PCIe x1: Both are storage connectors but may use different interfaces. An adapter or enclosure may bridge them, but speed will be limited by the slower interface. The U.2 (SFF-8639) (Storage) and PCIe x1 (Storage) share the same connector family.