1. This product supports the installation of 1 U.2/U.3 SFF-8639 hard disk in the PCIe NVMe M.2 NGFF SSD interface of the machine, but the buyer needs to purchase SSF-8611 to SFF-8639 cable separately. 2. The hard disk signal line goes directly through the PCIe NVMe M.2 NGFF SSD slot of your machine. The conversion does not need to go through the chip, and there is no restriction on the hard disk performance! 3. Support NVMe M.2 2280 hard disk interface installation, and do not support protocol M.2 interface installation. 4. This product supports PCIe 4.0 3.0 protocol. If your machine M.2 interface supports PCIe 4.0, the hard disk is 4.0, and the data cable supports 4.0, then you can run PCIe4.0 speed (some data cables cut corners, and some signal cables are shielded and the speed be affected). Note that if any of the above three links does not support 4.0, the hard disk not run at 4.0 speed. Note: 1. Make sure your motherboard has a PCIe NVMe M.2 NGFF SSD slot. M.2 NGFF SSD slots are not supported. The M2 slot of the protocol does not support the use of devices defined by PCI-E. Please check the information of the motherboard interface yourself or consult your motherboard official customer service. Make a purchase after checking clearly. Otherwise, it affect the use. 2. It does not support inserting SFF-8611 to 4 (or SAS) cables to connect or SAS hard drives. 3. Only SSF-8611 to SFF-8639 cables are supported to connect U.2/U.3 SFF-8639 SSDs. 4. U.2 SFF-8639 SSDs are not SAS interfaces. Some SFF-8639 interface hard drives (such as PM1735 ) are single U.3 mode and cannot be used. (The product printed words depending on the batch, but this does not affect use) Specifications: B Rear insertion direction Color: Black Material: PCB Package Contents: 1 * Adapter Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.