Bitcoin Forum

Good day,

I have a Raspberry Pi running Minera, and selected CGminer 4.x as the running miner. I had 2 Rockminers running (37GH/s ea), and recently added an Antminer U3 (63GH/s). The Rockminers each generate fairly close to what they advertise, running at 30GH/s each, but the Antminer U3 only generates 28GH/s. In other topics people were talking about different settings they use with the exe program, but as I am using the miner on a Rasp. Pi, I can't use these settings. So was hoping for anyone to give me advice on what I can do to get more out of the Antminer. I tried switching the miner prog from CGminer to BFGminer, but then none of the ASIC miners are recognised.

I am currently using the supplied power brick, I have tried it with computer psu but no difference in speed hash rate.
http://s7.postimg.org/rp01h5xij/Screen_Shot_2015_01_29_at_01_17_58.png

Extra info:
Left it run for the night, come back the following morning, U3 isn't running. Go and have a look, seems that the power brick burnt out. After getting in contact with the store, they tell me that the frequency was set too high and that's why it was running slow and overheated the power block. Since I see no way to set the frequency in Minera, he recommended me to use MinePeon, or directly from the PC.

My thing is, I tried using MinePeon once, but the Rockminers don't seem to like the environment and thus don't work.

Any ideas people? The guy from the store recommended for me to use it via the PC otherwise, but then that defeats the purpose of me having the Raspberry Pi...

Yes, I think I know exactly what the problem is, I've seen a few threads discussing it. In short, the antminer U3 and the R-BOX use the same generic driver to "talk" to your computer. If you have mixed models connecting to the same computer, shit gets hairy because it can't really tell the difference between the R-BOX and the U3.

Try testing just the U3 without the R-Boxes connected, and see if you get the advertised 63GH.

Best of luck!  :)

As armedmilitia said you can try running only the U3 to see if something changes.

For the frequency in Minera, you can always use the extra command field (or the total manual command field) putting there the right options to change the device frequency. I don't know the exact options for that but for example with Bfgminer and a Zeus miner as device you have to put "--set zus:clock=XXX"

Good luck

hello ,
how did you get the antminer running ...
i connect my antminer u3 to the raspberry pi with minera but it dont show at all ..
please help ..

This is true.  Both the U3 and R-box use the same driver and there will be problems.  From what I've seen, there is no easy work around. 

Just use one type of miner on 1 computer/r-pi and the other type of miner on another computer/r-pi.

Finding your U3 zombied is par for the course, it's how these things operate.  They might run solid for a couple days, they might zombie out many times in a single day, they are not very stable machines.

The factory power bricks are notoriously crap, as are the USB cables they come with.  Use a good usb cable on a powered usb hub and see if that helps.

If there is no way to set the freq in your setup, then how could it be "too high"?  It would be at stock 225 without any additional parameters.  And it's bumping the voltage up that burns out the power bricks, not freq.