The PCIe Gen4 Mini Cool Edge IO 38pin to U. 2 (SFF-8639) Cable 100 CM supports the latest PCIe Gen4 standard. The cable features a unique mini cool edge design that helps to dissipate heat, ensuring that your system stays cool even during heavy use. The cable is compatible with a wide range of systems and devices that support PCIe Gen4 The cable features a U. 2 (SFF-8639) connector, which is commonly used for connecting high-performance solid-state drives (SSDs). Micro SATA Cables Part# MCIO-2007-100