What speed is this Ethernet adapter capable of? John April 17, 2019 18:24 Updated Follow A. This adapter will support 10/100/1000 (Gigabit) Ethernet speeds. Related articles What if I am experiencing Ethernet issues? Quick Guide What is the speed of the Ethernet port on the Type-C Pro Hub with Ethernet? What is the Ethernet speed of this adapter? Is this compatible with the new 2018 MacBook Air? Comments 0 comments Please sign in to leave a comment.