Gen 3 and Gen 4 PCI Express (PCIe) share the same cable with SAS for high speed signaling up to 3m in length. This passive copper cable mates to the SFF-8644 connectors on the HIB6xx family of OSS host interface boards and includes the CMI (cable management interface) and serialized EEPROMs in the cable backshell. For x4, please order one cable. For x8, please order two cables. For x16, please order 4 cables. *Gen 4 cables are REQUIRED to support Gen 4 bandwidth and OSS Gen 4 products.