This M.2 adapter turns a regular M.2 SSD drive into a U.2 SSD. The drive can then connect to SFF-8643 connector in the system via a SFF-8639 to U.2 cable, resulting in a drive with the same performance as it would be if it had been installed on a PCIe slot. 
SFF-8639 NVME U.2 to NGFF M.2 M-key PCIe NVMe SSD Adapter for Mainboard Replace Intel SSD 750.
This converter enables the contion of a M.2 NGFF SSD in 2280, 2260, 2242 and 2230 format. Need M-key or NVME SSD,
the B-key support SATA III SSD.
The converter can be installed into your system internally through the U.2 68 pin interface.

  機能一覧

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• インターフェース (エッジ・コネクタ): SFF8639標準U.2スロット (PCIe X4) – U.2標準SSDの接続
• インターフェース(コネクタ): M.2 Key M PCIe X4 コネクタ
• インターフェース(コネクタ): M.2 Key B SATA III コネクタ

   規格一覧

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• エッジコネクタ: M.2 (NGFF) Type 2280 M (高さは除外)
• コネクタ: U.2 (SFF-8639), M.2 key M PCIe X4.
• コネクタ: U.2 (SFF-8639), M.2 key B SATA III.