I received my 10 sticks (in addition to the two I already had) and got them setup on Minera using the cgminer-gekko custom version. I've been slowly increasing the clockrate/voltage but seem to be maxed out at 275 MHz with the voltage set at 700mV (drops to about 685mV when they are running). Even cranking the voltage up to 800mV I cannot get the hashrate higher than 275MHz without significant HW errors or complete stick failure (according to cg-miner). When I was only running two stick I had no issues running 433MHz at 800mV on the pot. I'm no hardware guy and I don't know crap about electricity, but my current setup includes 3 sets of 4 sticks, each set of four sticks are on a 12V / 3A powered USB 3.0 hub. They are all connected to my Sony VAIO laptop running ubuntu and Minera (that's all it does). I'm thinking at 12V / 3A I should have about 9watts available to each of the 4 sticks, which should be plenty, but I have no idea if that's correct or not. I can't seem to figure out how to calculate a basic formula for the consumption based on hashrate, or the other way to calculate maximum hashrate based on supply power. COoling is not an issue I have two 80mm fans on each set of four hashers and they are warm but not hot and have been running for days.
Also, I seem to have issues with COMPC 9, as you can see in the Screenshot link below. I get lots of HW errors. This stick is setup identically to the other 11 sticks but it is the only one that gives trouble, even when I switch it around to different ports/hubs it's always the troublemaker.
I also haven't considered limitations of cgminer (if any) in regards to running so many sticks on one instance of the program. Any help / pointers / suggestions would be greatly appreciated as I am new to all this and eager to learn.
http://imgur.com/yp5oYscYMMV but my four sticks, each running at 750mV @ 350 MHz consume about 41 Watts at the wall on my Superbpag hub. As most have said here, I think it is the hub. If you have a Kill-A-Watt meter you can see how much the whole hub is pulling and that may give you some additional insight.
Also, my Superbpag 7 port says it is capable of 60 W but at 40 it starts to get very warm. I have a fan on it now and its elevated to get more airflow and I have seen a significant drop in Zombie sticks and HW error rate. May be coincidental, but temperature of the hub could play a role.
I am new to all of this too, but hopefully this may help.