Raspberry PI 2 Model B with 3 Antminer U2

[jeremyc482]

So i need some help with why my 3 antminer u2's are not running full speed.

Here are some screen shots.

Here is the command I am using to run BFGMiner:
http://i1177.photobucket.com/albums/x350/Jeremycox482/BitcoinMinercommandprompt_zpsl9haq4tl.jpg

Here is the actual run screen:
http://i1177.photobucket.com/albums/x350/Jeremycox482/BitcoinMinerruning2ghz_zpsoup39qva.jpg

I am running BFGMiner 5.2.0 and have all 3 U2's on a powers USB2.0 Hub

I have a sneaking suspicion that the issues lies in my USB2.0 hub, It is only a 5volt 2Amp hub.

Screenshot after running 11 minutes:

http://i1177.photobucket.com/albums/x350/Jeremycox482/BitcoinMiner10minrun_zps0bwv9pox.jpg

Any help would be appreciated. FYI I'm still new to this.

Jeremy

[wh00per]

Try set the speed right for the U2. And make sure you have enough power for them. I see a lot of HW errors in those screenshots, so it looks you're trying to overclock them over their limits. At 3W ea, you seem to have enough power.

--set-device antminer:clock=x0981
--set-device antminer:clock=x0881
--set-device antminer:clock=x0781
--set-device antminer:clock=x0A81
--set-device antminer:clock=x0681 (default)

The USB2 speed does not impact hashing. USB2 specs are higher than what bandwith these guys are using, combined.
Try one by one with different speeds. See what they say individually, then pick the slowest speed found where you get 2GH/s from them (the 3rd number) and apply that for all.

[jeremyc482]

I Switched over to CGminer and seem to get better numbers.

Still not full speed though. Here is a screen shot:
http://i1177.photobucket.com/albums/x350/Jeremycox482/cgminer6hours_zpseoak2uxp.jpg

If this is in the wrong forum, Mods please move to the correct one.

[philipma1957]

I Switched over to CGminer and seem to get better numbers.

Still not full speed though. Here is a screen shot:


If this is in the wrong forum, Mods please move to the correct one.

A) 5 volts x 2 amps = 10 watts   this means you should use 7.5 watts at most
so the hub is too weak


B) use two sticks not 3 and lets us know what happens

C) I asked mods to move this to support

[jonnybravo0311]

A) 5 volts x 2 amps = 10 watts   this means you should use 7.5 watts at most
so the hub is too weak


B) use two sticks not 3 and lets us know what happens

C) I asked mods to move this to support

This.  The U2 is 2.95W for 2GH/s.  Even though your hub claims 5v/2A, chances are exceptionally good that your total constant is 8W at most.  It just can't supply the needs of the three sticks.

[jeremyc482]

Yea thats kind of what I was thinking as well. I just took out the 3rd stick. We will see how it goes.

Edit: Removed 1 of the miners and running at Voltage 1100 got this result:

http://i1177.photobucket.com/albums/x350/Jeremycox482/BitcoinMinerrunning2_zpsjgdnihpj.jpg

So looks like my next purchase is a Powered USB Hub with 5v 4A PSU

[philipma1957]

try downloading cgminer 4.9.2 and run 1 stick.

here is why.
full size link

http://imageshack.com/a/img538/8128/Ke78mb.png


you should look like this:              you are missing freq 250

  if you do 1  stick and do it with cgminer 4.9.2  I would want to see a freq number like mine.

I know 1 stick would not overload but If you are missing freq that may be the reason.

[jeremyc482]

Here is the command Line I'm using to start CGminer:

http://i1177.photobucket.com/albums/x350/Jeremycox482/Command_zpsrijtc44a.jpg

I'm not quite sure what the "BMSC" options are as far as what the number signify.

[jeremyc482]

bump

[philipma1957]

sorry missed your reply.

try these numbers

cgminer.exe --bmsc-options 115200:20 -o your pool -u your worker -p 123 --bmsc-freq 0981


taken from here

https://bitcointalk.org/index.php?topic=522191.msg7028801#msg7028801

[jonnybravo0311]

Here is the command Line I'm using to start CGminer:



I'm not quite sure what the "BMSC" options are as far as what the number signify.

The bmsc-options set the baud rate and timeout value.  Always use 115200 as the baud rate.  That's standard for USB.  The timeout value can be tweaked depending on your preference.

Personally, I don't even use the bmsc-options on my U2s.

[jeremyc482]

Its amazing how much difference it makes when you get a USB Hub that is 4amps and can handle 3 Antminer U2's

http://i1177.photobucket.com/albums/x350/Jeremycox482/NewUSBHub_zps50zn5hqk.jpg

Looks like I'm running 6Ghs like I'm supposed to 

[philipma1957]

good I am good you got it up and running.

most often you need a decent hub.