F34B-F35B: PCIe 4.0 x16 to x16 Extension Cable, 1-to-1, Bandwidth PCIe 4.0 x16.
F34B-F35B-D8S: PCIe 4.0 x16 to x8x8 Extension Cable, 1-to-2, Bandwidth PCIe 4.0 x8x8.
Speed Bandwidth: PCIe 4.0 x16, Gen4 256Gbps, backward compatible with Gen3 and Gen2.
Cable Length and Pin Spacing Notes:Cable length refers to the length of the SlimSAS SFF-8654-8i cable.
Accessory Notes: Includes one SATA power adapter cable. Must be connected to the white connector to have 12V power supply.