 NVLink benchmarks show an achievable transfer rate of about 35.3 Gbit/s (host to device) for a 40 Gbit/s (2 sub-lanes uplink) NVLink connection towards a P100 GPU in a system that is driven by a set of IBM Power8 CPUs.For the various versions of plug-in boards (a yet small number of high-end gaming and professional graphics GPU boards with this feature exist) that are exposing extra connectors for joining them into a NVLink group a similar amount of slightly varying, relatively compact, PCB based interconnection plugs does exist.Typically only boards of same type will mate together due to their physical and logical design.