Customer Review

28 of 34 people found the following review helpful
3.0 out of 5 stars Seems well built, but will NOT handle 10 high power devices., December 23, 2013
Verified Purchase(What's this?)
This review is from: Etekcity 10 Port Powered External USB 2.0 Hub with LED Indicator, ABS Plastic Material, Support Windows XP/Vista/7/8& MAC (Electronics)
I purchased this to fill with USB based Bitcoin miniers. Each of those draws the maximum supported by USB2 (i.e.
500ma per port). While the power supply should be adequate for the task, no matter how I placed the USB sticks
into the ports I was never able to get more than 6 to function correctly at one time. I tried a more capable supply,
and a different compuer. It always seemed fine with 6, and the 7th would cause noticeable errors. . I expect it's more
campatible with a mix of high and low poer devices, and may well work very well in that context. It's just not internally
up to the task of running 10 high power devices at the same time.
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Tracked by 1 customer

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Showing 1-6 of 6 posts in this discussion
Initial post: Dec 26, 2013 5:21:50 PM PST
I've used the Anker 9-port USB 3.0 hub with the USB Block Erupters. They power 9 sticks just fine without any errors. What are you doing mining with USB ASICminers anyway? They will not pay off. :)

Posted on Feb 11, 2014 4:42:51 PM PST
OK, Lets do the math... If each of your Miners draws 500 mA and you have a 3 Amp supply, how many Miners can you run? Answer = 6 Proof: 500mA X 6 = 3000mA or 3 Amps. it would take a 5 Amp supply and the internal circuitry supporting this much current to get all 10 ports at 500 mA.

In reply to an earlier post on Mar 18, 2014 8:15:27 PM PDT
Ben Gee says:
I'm not an electrical engineer so I could be way off on this... The PSU is indeed 3 Amps but it is also 12 Volts or 36 watts, while the 6 devices draw a total of 3 Amps but at 5 Volts so it only 15 watts. So unless the voltage regulators are only 42% efficient, shouldn't there be enough power for more Miners?

In reply to an earlier post on Apr 19, 2014 10:29:26 AM PDT
Soup Tech says:
Very true, and in many cases you would have to sacrifice at least one miner as these particular units are not perfect. I have one of these and can only get 4 working without issues. I personally will not buy this unit again.

In reply to an earlier post on Jun 6, 2014 5:29:55 AM PDT
Kaiser Soze says:
Your reasoning is incorrect. For power, you can do what you are attempting to do, but not for current, unless the supply voltage and the output voltage are the same. The total output current can be N times greater than input current, as long as output voltage is 1/N as great as input voltage. The general rule is that input power and output power are the same except for the power that goes to generate heat. In the hypothetical case where no heat is generated, if it happens that output voltage is 5/12 as great as the input voltage, the total output current will be exactly 12/5 greater than input current. In fact, with any ordinary step-down voltage transformer that lowers voltage, current will be greater in the secondary, low-voltage winding than in the primary, high voltage winding. When you see a transformer with two wire leads having different thickness, the thicker wire is the low-voltage winding. The reason that wire (which has fewer turns than the skinny wire) is thicker is that it carries greater current than the skinny wire.

Posted on Jun 6, 2014 8:46:52 PM PDT
suem600 says:
Hi Alex

Please, I wonder if you could tell me what are high or low power devices ?
I leave the following usb drivers plugged in all the time : an all-in-one, printer, copier, mouse, keyboard, Sometimes I plug in an external optical drive , charge up my camera, and use a thumb drive to access stored data. I like the idea that this hub has individual led lights because sometimes my devices don't work and I have to switch the ports. I know some of the ports don't work and that is why I am buying a new hub.
Thanks for what you contribute this to Amazon forums.
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