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Author Topic: (Review/Guide) AvalonMiner 841 13.0 Th/s, 1290W Bitcoin (SHA-256) ASIC miner  (Read 831 times)
Thetaj
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March 27, 2018, 07:06:35 AM
Merited by suchmoon (1)
 #21

Hey guys, so here is the 2 comparisons

The first one is 0 voltage setting
http://i68.tinypic.com/qn3dad.jpg

The second one with temp is -1 setting
http://i68.tinypic.com/2wod7r4.jpg

here is the watt draw after -1
http://i65.tinypic.com/9r5ele.jpg



Moderator's note: This post was edited by frodocooper to remove inline image tags.
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HagssFIN
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March 30, 2018, 02:46:47 PM
 #22

Thanks for the quick comparisons.  Smiley

Btw, I have posted this document at the Steemit blog website now as well
https://steemit.com/review/@hagssfin/review-guide-avalonminer-841-13-0-th-s-1290w-bitcoin-sha-256-asic-miner

EDIT:
The troubleshooting and repair guide which I mentioned earlier is now finished and released in the mining support subforum.

Troubleshooting and repair guide for AvalonMiner models 721, 741, 761, 821 & 841
https://bitcointalk.org/index.php?topic=3224256

DPoS2
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March 30, 2018, 07:41:43 PM
 #23

What was Canaan's official statement on how cool these should be running? 

Right now I can easily keep mine cool   Temp:16 / 67     Fan: 3960RPM / 62%

 but in the summer......

Learn the *Truth* about Big Company Mining Pools!!! Stop Giving Your Money Away!!!
Thetaj
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March 31, 2018, 03:05:45 PM
 #24

What was Canaan's official statement on how cool these should be running? 

Right now I can easily keep mine cool   Temp:16 / 67     Fan: 3960RPM / 62%

 but in the summer......

Shouldn't be a problem. I have ran the avalon 741s for almost a year now and not a single one has failed.
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April 01, 2018, 08:55:46 PM
 #25

What was Canaan's official statement on how cool these should be running? 

Right now I can easily keep mine cool   Temp:16 / 67     Fan: 3960RPM / 62%

 but in the summer......

Shouldn't be a problem. I have ran the avalon 741s for almost a year now and not a single one has failed.

when I got my 821's I sent Canaan an email as I found a couple of issues which they since fixed in the controller firmware.

One of the questions was about heat.

The new ASIC's are NOT like the old ones, they will not tolerate high temps.  Yesterday I decided to look at the Avalon8 code in cgminer and same with the 821's.  The fan will moderate (or more likely max out) to maintain 70C.  Anything hotter will run that fan at 100% and runs the risk of damaging the ASIC's.  This is what was returned in my email from them as well.

While the fan moderation temp on the 741's was 90C (in the source code), it's 70C in the 800 series miners.  My recommendation is to *NOT* allow them to run for any length of time over the low 70's.  But that's just me

But 90 for any length of time, I'm very sure will be utterly destructive to them.
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April 02, 2018, 02:22:03 AM
 #26

Great review. What is the average and max CFM of the 841 if you don't mind me asking.
HagssFIN
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April 02, 2018, 10:45:44 PM
 #27

Great review. What is the average and max CFM of the 841 if you don't mind me asking.

AvalonMiner 841 has one piece Delta Electronics QFR1212GHE or other brand equivalent technical specs fan,
and it is installed in rear side of the miner for a pull configuration.

https://www.digikey.com/product-detail/en/delta-electronics/QFR1212GHE-SP01/603-1165-ND/1850534

Quote
Air Flow   210.4 CFM (5.89m³/min)

Megaquake
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April 16, 2018, 10:31:49 PM
 #28

Hey guys, so here is the 2 comparisons

[...]

No bad 1237 watts @ -1 offset my 841's run ~13.6 TH/s with -1 offset.

1 is 13602.03 GHS the other is 13674.88 GHS currently.



Moderator's note: This post was edited by frodocooper to trim the quote from Thetaj.
Thetaj
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April 17, 2018, 03:06:48 AM
 #29

No bad 1237 watts @ -1 offset my 841's run ~13.6 TH/s with -1 offset.

1 is 13602.03 GHS the other is 13674.88 GHS currently.

yea, So far without seeming to brag too much. It appears that after a month, every machine is working well. It seems that the 841s ARE more sensitive to temperature and will shutdown if temperature exceeds acceptable threshold.

-1 seems to be the best setting as of the moment.

There maybe more efficiency to be had in firmware upgrade though.



Moderator's note: This post was edited by frodocooper to trim the quote from Megaquake.
mgoz
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April 18, 2018, 01:53:15 PM
 #30

Can any of you guys post room temp vs machine temps? Curious to see. Intake temp on my 841's is constantly at 28-31C in a 20C room. One of them keeps going into idle status randomly and won't start hashing again until restarting PSU. Canaan support thinks it's the temperature. Intake in cgminer is roughly 10C higher than room temp and my room thermometer is directly behind the intakes.
richdmz
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April 18, 2018, 07:43:05 PM
 #31

on a related note, is there an add-on or something that can be used to have cgminer email temps?
HagssFIN
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April 18, 2018, 07:53:28 PM
 #32

on a related note, is there an add-on or something that can be used to have cgminer email temps?

As far as I know, nope.

You would have to code system like that yourself.

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April 18, 2018, 08:36:54 PM
 #33

on a related note, is there an add-on or something that can be used to have cgminer email temps?

As far as I know, nope.

You would have to code system like that yourself.
Only thing I can think of is to use monitoring software like Awesome Miner
Which can be set to monitor various miner conditions by looking at the cgminer API and yes can send a text/email when alarms thresholds are exceeded.

On a side note, rather surprised that Frodo has moved the AM thread to the altcoin area....

-Joshua Zipkin aka Joshua Alexander leaked AMT A1 miner skype chats http://bit.ly/1Qjt6lj
-For bitcoin to succeed the community must police itself.    HaggsFIN trip to Canaan
-Support Sidehacks miner development. Donations to:   1BURGERAXHH6Yi6LRybRJK7ybEm5m5HwTr
HagssFIN
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April 18, 2018, 09:36:05 PM
 #34

Yep, Awesome Miner would be the best readymade software for that job.
You just need a PC which has the software installed and is powered on 24/7.

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