Quote from: suprabitz on July 31, 2013, 09:42:09 PM

Quote from: CanaryInTheMine on July 29, 2013, 01:13:18 AM

Quote from: Garfield on July 15, 2013, 09:54:56 PM

Sipolar 20-Port

20

20 (?)

?

¥420.00 (~$70)

3.50 (?)

1

Short evaluation- DO NOT BUY THIS HUB.

Long evaluation - I bought this hub, thinking 90 watt, 20v, should be able to handle up to 30 usb eruptors, without a problem, but .....I just received mine and right off the bat, you could not run more than 12 miners in it, any more than that and the additional ones do get recognized, do not get assigned a com port number , but neither bitminer, nor CGminer, can run. In addition, the hub is split into two 10 port hubs internally (It has two usb cables coming out of it (one for the left 10 and one for the right 10)). I took it apart, and there seems to be a spot for a 2nd power adapter on the PCB, but there is no plug receptacle, I may put one in there, but there is some soldering involved and I am not the best at that. Having one cable plugged into the PC from the hub results in the hub identifying one set of 10 USB eruptors running with no problem. Plugging the USB cable in the 2nd usb port results in the other 10 being recognized, but when you plug in both, it looks like it recognizes everything (all 20) until you run CG Miner. Then CGminer crashes and you cannot run. it will work with up to 12 USB eruptors in it, in any configuration (6+6, 8+4, 10+2) but any more than that and cgminer crashes. Now, to be clear, I am running CGminer with other hubs (two 7 port and one 10 port(and more than 12 USB eruptors, so I know its not a CGMiner configuration issue.), plus, bitminter doesn;t recognize more than 12 as functional either.

Save your money, this hub is not the answer for running 20 USB miners at once (even though I wanted it to be.)

I finally received this hub 3 days ago and it's a POS.... so I definitely confirm Garfield's conclusion. I wish you had reviewed ot before I bought it.
it looks solid and promising but it can't handle more than 15 and runs hot. you also get unpredictable stoppages on Eruptors.
as Garfield concluded, don't bother with this POS

are you sure its not a bad hub or power supply? there are 2 people on ebay selling this exact product (search bitcoin 20 usb hub) and they claim they've been running 20 w/o problems without upgrades and even show 20 BE hashing away in the ebay pic. they are sipolar 20v 20 port hubs with the 2 cables

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=271249085838&item=271249085838&lgeo=1&vectorid=229466

I connected 15 (sapphire batch) plus a raspi and a wifi adapter to this hub.

I have 15 hashing. Its not perfect(sometimes 15 will run for 24 hrs straight, other times only 14 will hash), but i am using cgminer 3.1.1 on a pi. I originally thought it might be a power issue, but then...

When I run minepeon it runs perfectly. Minepeon uses arch linux, diff usb drivers, and cgminer 3.3.1.

Maybe you have a bad power supply? Or did the first batch use more power?