USB devices work on 5V, even if the usb hub sometimes have 12V power supply. Running the Pi on the same hub as your miners can create a negative feedback look and most of the new Pi versions are really power hungry (2+ amps).
Ok, That's what I had figured but just wanted to check. Also placed the Pi back on its own supply. I did test the 10th port, it transfers data but I noticed it has a charge mode light and a data light. I have to assume I don't receive the extra amps with a data device hookup up. When i plug my phone in it switches to fast charging mode without data.
gt_addict those are some awesome numbers. Its amazing to see how little the diminishing returns are in terms of Mhz and gh/s.
It makes me curious as to how far the chip and unit could be pushed with adequate power and cooling.