That's great advise for anyone running more than 2 or 3 hubs.  The atx psu I modded could handle my load until I exceeded 40 usb erupters.  Most PC PSU's only have a 20-25 amp 5 volt bus, they are limited. I use a 5 volt 50 amp Mean Well industrial psu now.  The MW runs 64 sticks without generating a lot of heat and it's quiet, and they are cheap.