Consider a 60-watt USB 3.0, 7-port, Hub with 2 (12-watt) *Fast Charge* ports. 

* `HooToo USB 3.0 7 port + 2 "fast charging" ports (HT-UH010)` = **60-watt adapter**;
* (USB 3.0 port at 5-watts) \* 7 ports = 35-watts;
* (12-watt "charging only" port) \* 2 = 24-watts;
* 35 + 24 = **59-watts worst case consumption**;

I'm sure that *x*% of the time, each port can be *y*% over/under their wattage specs. Because of that variability, if I end-up needing more than 60-watts:

* is there expected behavior on a MacBook with 2 \* (USB 3.0) ports? One onboard port will have a `Diamond USB HDMI/DVI Display Adapter`. The other will have this hub with a few hdd attached.
* if there ever is trouble with devices (mostly hdd) attached to hub, I can just unplug whatever from the *Fast Charge* ports. This frees-up 24-watts, and so eliminates wattage as possible cause of device failures?
* will I/O bandwidth improve if I don't use the *Fast Charge* ports and just wall charge?

disclaimer: I've no background in electronics and just did a lot of googling for these calculations.