Another cheap Hub USB: aprox 15€

SONYTEC HUB NEXOOS 395

7 Ports (2 vertical behind)

5 V 3 Amp

Test ok with 5 USB Erupters in Windows 7, Windows Xp and Debian (Cgminer (last version) and BFgminer)

Setup for a lot of sticks is tricky.

What is your pc? (mobo if it is diy)

What are your hubs?

 most hubs have an inadequate power brick.
 A 10 port hub is better off with a 12v 6 amp brick.
 No hub comes with that brick.
most 10 port hubs have a 12 volt 4 amp or a 12 volt 5 amp brick.  I tested a shit load of hubs.

  the best one in terms of  stock brick watts to ports is this one

http://www.amazon.com/gp/product/B00B59BFVI/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1  it has a 12 volt 4 amp brick or 48 watt to 7 port or 6.857 watts to 1 port


here is one with 10 ports and the same brick

http://www.amazon.com/Aitech-Adapter-backward-Compatible-aluminum/dp/B009NESU4M/ref=sr_1_1_m?s=electronics&ie=UTF8&qid=1376240347&sr=1-1&keywords=orico+usb+3.0

 so that  is 48 watts by 10 or 4.8 watts a port.     


   next is a root hub rule   what the f is that rule  simple chaining of ports has a limit of 5 hubs

   1st hub is the plug

2nd hub is  the first hub you attach >>>>>>>>>>>> lets say 10 jacks - 1 to chain  = 9

3rd hub is the hub you plug into the first  hub lets say 10 jacks - 1 to chain  = 9

 4th hub is the one that plugs into that  lets say 10 jacks - 1 to chain = 9


 5th hub would be the one that plugs in to the fourth 10 jacks = 10 total of 37 sticks to one plug    may not do this depends on your mobo may only do 3 hubs or 9 + 9 =10 = 28 to a jack


   I did find a good brick for the 10 port hubs


http://www.amazon.com/gp/product/B000VE7GQQ/ref=oh_details_o05_s01_i00?ie=UTF8&psc=1


 has more available power for a 10 port hub.


  so let us say   you have 6x  10 port hubs  with better bricks then stock.  you get a 56 stick pc.

  restart is power off via the screen power button lower left windows screen.   turn off all hubs.  then boot back.  once the windows screen comes up power on all the hubs.

then call bitminter up via windows 7 using  the explorer  browser sign in  go to the bitminter button engine start press it. click the accept for the risk question then wait for the 56 sticks to come up.  takes me about 10 minutes to do 84 sticks on 2 machines

forgot a good trick for counting sticks.
start 3
skip 3
start 3
skip 3     

3 sticks = 1gh

6 sticks = 2gh

9 sticks = 3gh 

12 sticks = 4gh   


After playing with gear tonight I am now running 80 sticks on 1 machine.

   the first piece of gear is this

http://usb.brando.com/usb-20-port-hub_p03123c039d015.html 

it will run 10 sticks and 6 hubs of 10 sticks so that is 70 sticks 


 I have 6 of these plugged int the above 20 port gear I have the other 4 ports empty. I use the better power brick. I linked to.

http://www.amazon.com/Aitech-Adapter-backward-Compatible-aluminum/dp/B009NESU4M/ref=pd_cp_pc_1


   I use this mobo

http://www.amazon.com/LGA1155-USB3-0-Mini-ITX-Motherboard-Z77E-ITX/dp/B007RS71O6/ref=sr_1_1?s=electronics&ie=UTF8&qid=1376277717&sr=1-1&keywords=asrock+z77+itx 

 I plug into the 2 usb 2.0 jacks in back of the board.  So that is 70 sticks.

 I plugged 2  of these 7 port  hubs

 http://www.amazon.com/ViewHD-Professional-Premium-Quality-Chipset/dp/B00B59BFVI/ref=sr_1_2?s=electronics&ie=UTF8&qid=1376277811&sr=1-2&keywords=viewhd+7+port

 I use the 2 back usb 3.0 ports   I can only use 14 usb 3 sticks with this board so I use the 2x 7 port hubs...


I am at 80 sticks but I could run 4 more for sure or 84 sticks..

I think that is the max on this mobo due to hub limits. 


Still 80 sticks and 320 watts with the screen turned off is a money maker for now.

Pardon me.  I'm not an electrical engineer nor an electrician but common sense tells me that if a 12V current is applied to a 5V device, such a device would fry.  No?

I just received a Juiced Systems USB 3.0/2.0   13 (4x3.0, 9x2.0)
Your guide says it can run 6, but that is total bs!
I can run 3 MAX on this thing before I start getting more hardware errors than accepts. As soon as I plug in a 4th I get nonstop errors. Here is a picture from when I woke up this morning. The BAJ is a BFL Jalapeno


I had 5 plugged in. After messing around for a while, I finally got it to stop showing USB AMUx READ BUFFERING XXX EXTRA BYTES and have all of them mining correctly with 1% or less error rate. I had to reduce the number connected through this hub to THREE before the errors went away!

It seems only the USB 3.0 ones do as they are required to be able to supply 0.9A per port (http://en.wikipedia.org/wiki/USB_3.0).

Is there a way to measure the amount of power coming froma USB port?

no idea why people pay so much for Hubs...

I use 12 year old USB 1.1 Xircom 7 port hubs. Their supply is 5v 3.7amps. I do 6 per hub and they are stackable.