... never used it but all my 10 port hubs with 10 sticks using a 12 volt 4 amp brick killed the bricks after 2 weeks of run time. I have a lot of spare 12 volt 5amp bricks and they worked great. Your gear is 12 volt 3 amp but the markings or ratings are not what count. for all I know my 12 volt 4amp bricks were less then your 12 volt 3amp brick. I have found this brick works well
http://www.amazon.com/gp/product/B000VE7GQQ/ref=oh_details_o05_s01_i00?ie=UTF8&psc=1 I have 1 of these
as does this one
http://www.power-guide.com/pdf/SPU50.pdf meanwell spu50-3
I can't find these any more I have 8 or 9 from other projects these are very good if you can find them.
these usb miners draw 5V x 0.5A each, so the total draw is 2.5VA. if the brick is really a 12V 3A then it can output 36VA, which is plenty of power for 10 usb miners (2.5VA x 10 = 25VA). that is assuming the brick is really rated at that.
the math you are doing is wrong. A 3amp 12 volt brick can do 3 x 12 or 36 watts output. (max in theory) ruining gear 24/7/365 you should not exceed 80% of the max rating so 80% of 36 watts is 28,8 watts. 10 sticks pull about 25 watts. So it looks good as 25 watts is less then 28.8 watts. But the brick is at 12 volts the sticks at 5 volts this means the 12vdc is ruduced to 5vdc... so 28.8 at 90 percent is 25.92 watts all these numbers show me that the brick would burn up in 24/7/365 use with 10 sticks in less then a month...... Of course the only way to know this is to test it since no one knows the real rating of the brick...
in the meantime I found some very good replacement bricks they are relabeled meanwell spu50-3 bricks.
I found them on ebay they give 12 volts at 5 amps and would run any 10 port brick endlessly. I ordered 6 bricks today.
http://www.ebay.com/itm/161084703940?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 he will mail them to me in a few days . I will get back with a report on these bricks.
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BRILLIANT IDEA!!! I have been having problems with underpowered USB hubs ever since I started with some USB ASIC Eruptors.... Instead of replacing / Trying another type of hub THIS is a GREAT first STEP... Just replace the POWER SUPPLY!!! BRILLIANT IDEA... Anyone having a prob with USB hubs should Definitely TRY THIS FIRST... great Idea... digeros PS this guys is charging $12 shipping BTW???
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I know people who did that to cheap USB 2.0 HUBS and it did not go well...