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I recently purchased a new Avalon 741. After completing configuration and starting the first few test runs, i realized that it’s producing a very low mining speed (around 500GHs only). Whereas it is expected to produce far more speed upto 7THs and maybe higher.

I tried with multiple types of pools such as slushpool, kano and nicehash, but none of it could produce anything beyond the average speed of 500-600GHs. I don’t know if I am doing something wrong or if issing anything here, but everything seems to be normal in terms of the settings. For example, the network latency to slushpool and nicehash is around 30ms.

Did anyone faced the same issue with Avalon miners to help troubleshoot and fix this problem? maybe some settings in the CGminer software that I am not aware of?

The Avalon miners have error codes. Have you looked them up?

CGminer shows error code 15, which I presume is a normal one?

show us a  proper gui  of at least a two hour test run.

here are 2 avalons running correctly .

using -2 setting


https://i.imgur.com/6EVcuXb.png

I just did a reset of CGminer to default and started the miner with -2 setting. I will send a new screenshot after few hours, but in the meantime, pls take a look at the image if you can spot any problem.
https://drive.google.com/file/d/0B9NWjdgjoBrWU3FqN3lXSTdsbUk/view

don't know 45 seconds is meaningless time frame.

looks like you are not hashing but 45s is too short of a time frame to have any meaning

now  if it is 20 minutes and you are at zero hash something is wrong.

Did you check all your cable connections in the back? Did you confirm the lights on the hashboards?

How long did you let it run when you first hooked it up, it's needs some time to ramp up.

I also noticed that even in your 45 second shot, that your GHSasc, was 1600+ which still isn't where it should be but that is indicative of it ramping up. I'm pretty sure that corresponds to your hash rate for that machine.

Did you try and run it on any other pools?

it stays like this for long, and the 1600+ figure remains there even if it starts mining. Now i did a total reset and waiting, still at 0 GHs.
I tried wit several pools slushpool, kano and now trying with nicehash as the primary pool.
will keep you posted

Okay, and what colour are the lights on the back of the miner, and on the AUC3?

AUC is green, and at the back of miner 4 green with one blue on the top

that means it should be working

Well, Now there seems to be a new hardware issue. After running for few hours, one side of the miner stopped working. Switching off the power supply and on again, it statrs working but few minutes later it is off again. I hope its a power supply issue. Otherwise the low mining speed could be a result of that one side being faulty. I hope i can test it tomorrow with another power supply. Also waiting for a reply from Avalon support 
 

It can take a few days to reach support but maybe things have slowed down.

What power supply are you using?

what is the power supply?

there are two power supplies, each 650W.

what make and model please?

this is the one

https://www.bequiet.com/en/powersupply/387 (https://www.bequiet.com/en/powersupply/387)

what do you suggest? should both psu replaced by one psu with 1300-1500W?

I found this review.

https://us.hardware.info/reviews/5009/be-quiet-power-zone-650w--750w-review-affordable-quality


it could be the psu's

they may fall short

the only way to confirm is to replace with a higher wattage psu. I found this one but i need to buy two.
http://www.corsair.com/en-us/cx-series-cx850m-850-watt-80-plus-bronze-certified-modular-atx-psu-na (http://www.corsair.com/en-us/cx-series-cx850m-850-watt-80-plus-bronze-certified-modular-atx-psu-na)

do you recommend using two psu units or just buy one psu with a high wattage?

 

what country are you in?

what power do you have 120 ? 240 ?

Europe 240V

this should work

http://www.ebay.co.uk/itm/High-Efficiency-2450-Watt-Power-Supply-Server-PSU-Antminer-Mining-Miner-Machine-/222669346248?


I think you have a psu issue because the light center high  on the avalon turns blue


and the board lights left and right turn green.

that means the gear is working.

thank you all for the support. After replacing the power supply it started to work in the range of 5.8THs. I used two 850W Corsair power supplies as these were available and the change was noticed immediately after. The question remains open whether I should aim for a higher figure with the Avalon 741 miner?

hey bohoma, I just recently had an issue with my recently purchased Avalon Miner 741 as well... my issue was the 1 power supply I was using (HP 1200w hot plug psu + breakout board) was getting a low voltage from my American 110v power outlet, so it only produced enough wattage to power my Avalon for 10min at a time before it automatically shut down.
I did figure out how to make it work with that PSU, by changing in the Avalon Advanced settings view:

Status Tab > CGMiner Configuration > Voltage Offset setting that to -2
(I don't know if this is the proper way of setting things but it seems to work well)

Now my Avalon 741 works on the 1200w psu with the 110 v outlet, although the compromise is my TH is pretty pinned at 7.2-7.4 TH/s rather than being able to get 8 TH/s like it could with a proper PSU without the voltage offset.  I am doing this and waiting until I can get the 1600w Sorcerer power supply (that is specifically made for the Avalon 741 miner) when it comes available again so I get the full range of TH.

One question I have: why are you using two separate power supplies?  I have also made a similar search when researching my own PSU issues, and nowhere did I find it was proper to use two separate PSUs on an Avalon 741 (I only saw posts about people using the Bitmain Antminer with two separate PSUs, one for each board/side).  The problem I see is that each PSU is separately trying to adjust the output to the machine (without knowledge of the other PSU).  To me that seems like you might overwork both PSUs more than they should be, IMHO.

There may be no problem doing this with Avalons, but I have not seen it documented anywhere like i have seen with the Antminer.

Anyway, my recommendation is if you can do it get only one PSU and preferably something with a higher wattage ceiling so your avalon can get the full power (like the Sorcerer 1600w that Canaan makes).

Hi Joel coin,
thanks for elaborating on your experience. Your point about two psu's is well taken, however, this information was taken from Avalon site itself.  Check this link:

https://canaan.io/question/avalonminer-741-power-supply/ (https://canaan.io/question/avalonminer-741-power-supply/)

I am in Europe and using 240V input, and I always thought that offsetting the voltage by -2 will probably have a different effect compared to 110V input.

what you are saying about the two psu's could be valid, but I don't have a big psu to validate and don't want to spend more money on this miner as I am doing it in order to learn and explore new opportunities.

I will write to Avalon tech support and I hope they can confirm, otherwise they should correct their website.

Oh wow, I am surprised I did not run across that link.  I guess it should work with two PSU's..


Have you tried any voltage offsets to get a better result from the miner?  I see there is also a +1 voltage offset which I am assuming would try to draw more power from the PSUs and in effect should get a higher TH/s.  I'm speculating because I cannot test it with my setup either.


I don't know enough about PSUs or the internals to state what exactly could happen either negative or positive when using two with this miner, so if its working now probably ok to stick with what you have.  It also wouldn't hurt to confirm IF you can get Avalon support to reply back...

what coin is more profitable to mine now7

Bitcoin?  I'm not sure how you mean "more profitable" ... it depends on what kind of coins you are able to mine, ie. if you have any ASIC mining machines, how many of them you have and what algorithm they were designed to perform (SHA256 or scrypt or X11 etc etc).  An Antminer S9 can't mine ether or Litecoin and an Antminer L3+ can't mine Bitcoin.
Lastly you need to know the sum/total GH/s or TH/s for each algorithm you have available.

If you're talking about GPU mining I'd say unless you have many many high end GPU's in a specialized mining rig, probably no coins are profitable to mine because of the cost of electricity involved, it wouldn't be that efficient or cost effective.

You really need to give more details when asking an open ended question like that, because the real answer to your vague question (without knowing any details) is "it depends"

Plus your question has nothing to do with the OP's question and reason for starting this thread, so its off topic.