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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.