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on that last note, my gridseeds and antminers hate my hsb3.0 ports, no worky at all
My Antminers LOVED my Anker 3.0 9-port hub with its 12V 5amp power supply... but the PI sure didn't like it!
All (10) of my gridseeds are running on the USB 2.0 hub that came as part of the 10-gridseed kit. It is working beautifully with them.
A powered USB hub is not really necessary for the Gridseeds, they draw hardly any power from the USB port.
I have 20 of them running on 2x 10 port hubs, both not powered.