Assuming 100% efficiency of converting 12v to 5v.
And, that I did the math correctly to convert 12v4A to 5v9.6A.
What math?
The monoprice has 4A@5V power supply.
The anker one has 4A@12V power supply.
What is your point? Other than to disagree with yourself?
The USB miners will (I assume) self identify as USB 2.x devices. As such, the hub, if properly designed, will limit each device to 500mA. Which isn't the problem. Aggregate power draw is the issue.
That other hub you linked has the same constraint of 4A max. Same power envelope as the first one. Seven miners max. And the form factor looks far less conducive to cooling.
The anker one should deliver ~960 mA to each USB port.
Anyway, anyone run 10+ Erupters?