On certain chipsets (e.g., early AMD USB 3.0 controllers like the Etron EJ168), the SSS6698-BB often fails to negotiate SuperSpeed mode and falls back to High-Speed (USB 2.0). A workaround involves inserting the drive slowly or using a powered USB hub.
Technical Overview and Analysis of the Solid State Systems SSS6698-BB Flash Memory Controller Solid State Systems Sss6698-bb