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USB 3.0 has a max power spec of 4.5W

USB 3.2 up to 7.5W


Those $100 Aquantia chipsets use 4W at 5Gbit and 6W at 10Gbit.


So you could certainly do 2.5-5Gbit in a USB 3.0 dongle...and 10gig on a newer port.