Micro SATA Cables ‌MCIO 74 Pin X8 to 1 x U.2 NVMe SFF-8639 GEN 5 Cable Length 175mm

Because the host side is x8 while the target is 1 × U.2 NVMe, the usual electrical implementation is that the cable carries one PCIe x4 NVMe link to the U.2 drive, while the remaining host lanes are either unused, reserved, or routed according to a board-specific pinout. That is the normal architecture, because a standard single U.2 NVMe SSD generally consumes PCIe x4, not x8. Closely related MCIO x8 products on the market are often described as splitting one x8 host connection into two independent U.2 x4 links, which reinforces that a single-drive version would normally present only one x4 endpoint.

• Direct connection from a server motherboard MCIO x8 storage port to a U.2 NVMe SSD
• Connection from a PCIe Gen5 retimer/switch/HBA card to a U.2 drive carrier
• Compact chassis or dense storage designs where a short cable run is needed