So, I have a simple question. I am thinking of getting an USB 3.0 hub. I would connect it to an external power supply which gives out 2A of current.

What I would like to know is, what is the max current I can get from that hub for devices, is it 2A, or is it 2,9A since my USB gives out 900mA of current?

E: Or does it depend on how the board inside the hub is wired and there's no way of knowing?