No, that was not my point. The point was that on these connectors the speed is normally limited by the speed of the controller on the ssd. All of these can in principle obtain speeds of 10 GBit/s (~1.1 GB/s), but in reality, the most I have seen on PCIE is ~750 Mb/s. I do not know of any sata express divice on the market, and M.2 pcie has the identical same channels as pure pcie . So this depends on the specific device you want to use.