How much current can a usb 3.0 hub provide per port? How is this typically managed?

[salil]

And why do so many usb 3.0 hubs seem to only supply .5A per port despite coming with a 50-70w power supply?  Many of these hubs claim to be able to handle 4-6A at 12v.  USB power management is such a mystery...

[Cliff Matthews]

Perhaps you can provide links to some products or the chips within?
Do you want use the hub as an off-line multi-port charger? ..perhaps while the USB host is unavailable to enumerate a power budget?

[Cliff Matthews]

Maybe this is what you're looking for: http://thewirecutter.com/reviews/best-usb-hubs/
(The article is just a few weeks old, and gives a good look at current "state of the art" 3.0 hub-chargers).

This one below is 45usd and offers 3.1 amps of charge across 2 ports plus 7 more with host connectivity... looks nice

[salil]

Perhaps you can provide links to some products or the chips within?
Do you want use the hub as an off-line multi-port charger? ..perhaps while the USB host is unavailable to enumerate a power budget?

Just looking to use as a hub for many power hungry devices such as optical drives and bus powered external hard drives.  No need for dedicated charging ports, I have plenty of Anker and apple usb wall chargers for that purpose.

[salil]

Maybe this is what you're looking for: http://thewirecutter.com/reviews/best-usb-hubs/
(The article is just a few weeks old, and gives a good look at current "state of the art" 3.0 hub-chargers).

This one below is 45usd and offers 3.1 amps of charge across 2 ports plus 7 more with host connectivity... looks nice
http://ecx.images-amazon.com/images/I/71OR-2TSpTL._SL1500_.jpg

Yes, I've seen that hub but it's unclear how much current each port can provide in the hub (not the charge only ports)