If you only plug in one of the power supplies, does the device still function but only running up half the boards at 250GH/s?
Just thinking about if a breaker trips.
Since this rig is running with a USB hub inside, yes, that is exactly what will happen.
When they start using xlink, it will depend on if the master board is taken out or not so if one PSU goes down, you could lose the whole rig.