Edit 2: Oh I also forget that any USB cannot exceed 500MB/s. Thunderbolt can, USB cannot, so really even if its reporting being in a 3.0 Slot, its more like 1x 2.0.
High quality USB CABLES can easily exceed that, when not used for actual USB service.
Don't confuse the "usage spec" with the "hardware spec", like folks using "PCI-E 6 pin connections" to power ASIC miners sometimes do.