I bought a Plugable 3A 7-port hub (Model USB2-HUB-AG7) and it has been taking care of 3 screens with video without a problem--4 I'm not quite sure about at the moment, as it has cut out a couple times so far with 4 going at the same time.
My Inland 7-port hub (silver aluminum) has taken care of 2 screens without issue as well.
I've wondered the same thing about simply upgrading the power supply...I'm really not sure.
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