Avalon 8 official specs released

[ccgllc]

How did you do that?  Because if you just selected -1 in the web UI, that didn't make the change, you have to add the "--avalon8-voltage-level-offset -1" string in the more options line in the configuration the 0 - zero option is hard coded no matter if you selected the -1, -2, etc or not. ... little known detail.  BTW, from 0 to -1 on mine will show an approx .150-.2 Th drop per miner in the rate, but the outlet temp will change by a couple of C too

Wow.  I didn't know that.  Rather presumed using the Avalon Web Interface and selecting the pull down menu for voltage offset would do the trick.  That is rather surprising news.

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[akadamson]

How did you do that?  Because if you just selected -1 in the web UI, that didn't make the change, you have to add the "--avalon8-voltage-level-offset -1" string in the more options line in the configuration the 0 - zero option is hard coded no matter if you selected the -1, -2, etc or not. ... little known detail.  BTW, from 0 to -1 on mine will show an approx .150-.2 Th drop per miner in the rate, but the outlet temp will change by a couple of C too

Wow.  I didn't know that.  Rather presumed using the Avalon Web Interface and selecting the pull down menu for voltage offset would do the trick.  That is rather surprising news.

All you have to do is look under the status->processes tab in the web UI and scroll down till you find the cgminer process and you'll see how it was started and you'll see that if you tell it to be -1 in the UI, it will still be 0 in the processes.  Doesn't matter which one you select, it will always be 0.  Adding it in the more options will add the string to the end of the command launch string and it will override the 0 hardcoded value to whatever you specify, and it doesn't need to match what is the UI.

[ccgllc]

All you have to do is look under the status->processes tab in the web UI and scroll down till you find the cgminer process and you'll see how it was started and you'll see that if you tell it to be -1 in the UI, it will still be 0 in the processes.  Doesn't matter which one you select, it will always be 0.  Adding it in the more options will add the string to the end of the command launch string and it will override the 0 hardcoded value to whatever you specify, and it doesn't need to match what is the UI.

Just me, or does that sound kind of like a bug?  Clearly the Web UI could make that change for us...

[akadamson]

All you have to do is look under the status->processes tab in the web UI and scroll down till you find the cgminer process and you'll see how it was started and you'll see that if you tell it to be -1 in the UI, it will still be 0 in the processes.  Doesn't matter which one you select, it will always be 0.  Adding it in the more options will add the string to the end of the command launch string and it will override the 0 hardcoded value to whatever you specify, and it doesn't need to match what is the UI.

Just me, or does that sound kind of like a bug?  Clearly the Web UI could make that change for us...

it's been that way since the 821's. when I found the issue, I sent Canaan an email, that is when I found out they meant to *NOT* leave the undervolt stuff in the 8 series UI, and always keep it at 0.  I completely get why, there are some 821/841's that *won't* run at -2... I have 2 841's that wont for example, but -1, 0, and +1 they run perfectly.

That same email is where they told me the reason for the 100% fan, and if you look in the ccminer code, while the 741's had a fan moderation temperature of 90C, the 8's that was changed to 70C.  The high end shutdown limit is 105 I believe in both, but they really don't want them going to that limit.

[richdmz]

I noticed this too and made a post here and spoke to Canaan about it. I spoke to Canaan and they said reversing the (sorcerer) fan should be ok if temps stay under 40c. We plan to reverse them too as you did to see as we are run cold/hot aisle setups and curious to see if there is a temp improvement.

I'd like a better reply from Canaan other than 'should be' ok. Would be nice for them or their vendor to model & verify just what happens to the various hot spots in a PSU and make yay/nay based on that. Changing from blow to suck will drastically change the flow patterns inside the PSU...

Perfect confirmation would be Canaan acting on this and changing the flow direction on future Sorcerer's they sell.

But - that said, when I get back in-country next week think I'll give it a whirl.

I agree their answer didn’t give me the warm and fuzzies but I also don’t need the psus recycling  hot exhaust air

[richdmz]

Anyone have any issues running 20 miners on one controller. I have an issue where a miner or two will drop out of cgminer and then occasionally pop in and out but never resume hashing unless I physically reboot the miner  Not sure if this a hardware issue with the miner or a stability issue with the controller/auc. I know another user here says he can’t run the full 20 and keeps the number per controller low for stability reasons. Any seen this too and know what it is?

[ccgllc]

Anyone have any issues running 20 miners on one controller. I have an issue where a miner or two will drop out of cgminer and then occasionally pop in and out but never resume hashing unless I physically reboot the miner  Not sure if this a hardware issue with the miner or a stability issue with the controller/auc. I know another user here says he can’t run the full 20 and keeps the number per controller low for stability reasons. Any seen this too and know what it is?

I plan on running 15 per Pi 3 controller - (3) strings of 5 with one open USB port and a spare AUC3.  That way if I need to take one miner out of a string, I can patch the remaining miners in that string to the 4th AUC3. 

[fanatic26]

Anyone have any issues running 20 miners on one controller. I have an issue where a miner or two will drop out of cgminer and then occasionally pop in and out but never resume hashing unless I physically reboot the miner  Not sure if this a hardware issue with the miner or a stability issue with the controller/auc. I know another user here says he can’t run the full 20 and keeps the number per controller low for stability reasons. Any seen this too and know what it is?

I have 1000 Avalon 741s running in batches of 20 with no issues. I wonder if the 8 introduced some kind of instability?

Make sure you have at least a 2.5 amp power source for your RPi, underpowering them leads to AUC crashes and other issues.

[richdmz]

Anyone have any issues running 20 miners on one controller. I have an issue where a miner or two will drop out of cgminer and then occasionally pop in and out but never resume hashing unless I physically reboot the miner  Not sure if this a hardware issue with the miner or a stability issue with the controller/auc. I know another user here says he can’t run the full 20 and keeps the number per controller low for stability reasons. Any seen this too and know what it is?

I have 1000 Avalon 741s running in batches of 20 with no issues. I wonder if the 8 introduced some kind of instability?

Make sure you have at least a 2.5 amp power source for your RPi, underpowering them leads to AUC crashes and other issues.

thanks, I am running the official Rasberry adapters with the Pi3s just to ensure power wasn't an issue as I read in general about Pi instability with under powered adapters. I don't know if there is any instability but just fishing for possibilities. The other user here said that he had reduced hash and instability running a full controller but it may just be a YMMV kind of deal. I am also running the latest controller and firmware.

[Thetaj]

So far non of my machines have broken down. They all do 91-94W/TH @ -1 config. Idk what people are complaining about

There seems to be a problem with the temps, going above 30°c. Personally, mine have been ok between 30°c and up to 38°c.
Have you seen any issues, regarding the temps of your machines?

Not as far as I can tell, I have looked at some of the log files to see whether the chips are doing ok. So far they are doing well. I have a couple of machines that run at 13.5th instead of 13.7 but they also draw less power so I can't really complain.

My temp is constantly 35+ btw

for those of you wondering, I have 90 841s

[Didley1JT]

I'm finally back!

Just moved my family from Louisiana to the Pacific Northwest. It's so much better here. And electricity is almost two cents per kW-hr cheaper! They have a three tier power rate here that starts at $.07361 and then tops out at $.08118. Had the electrician come out and start me with two 30A/240V circuits.

Currently running the two Avalon 821s I bought from the first batch (finally). At the 0 voltage setting, they're sitting at 11.5TH/s and 11.6TH/s and both are at 30deg Celsius. Next step is to take advantage of the heated air to help heat the house when it's cold. Kind of bad timing as we head into summer, but at least I'll be ready for the fall/winter this year.

[philipma1957]

Well my testing shows intake temps cause large power increase.

67f=1365 watts
76f=1424 watts
81f=1484 watts


I was able to get same results with 2 different psus
And on 2 different pools.

I want to do an 86f room test next
Then a 91f

[ccgllc]

I sent an email to Steven, let's see if they have some lab test info or etc.  which could help to specify the A841 technical specs more accurately.

Hi HagssFIN - Been a week now... have you heard anything back from Steven?

[HagssFIN]

I sent an email to Steven, let's see if they have some lab test info or etc.  which could help to specify the A841 technical specs more accurately.

Hi HagssFIN - Been a week now... have you heard anything back from Steven?

No I haven't heard yet.

[philipma1957]

I was able to do what I consider a quite remarkable video

Setting the stage for this youtube video I turned on a lot of gear in my garage to get it to  87f  which is 1 f higher then the 30c or 86c number used.

I did it real time  it was 55f outdoors of my garage and my garage was 87f.

I opened the two garage doors and the back door to cool off the garage watch the watts drop in real time

Your video will be live at: https://youtu.be/KEctJaz4Mo0

what does this mean?

My opinion is  summer will not work well if you plan to fan cool this miner.

[taserz]

I suggest trying to pickup one of those atic gable fans for your garage or solar array it will really help with moving air out of the place just be sure you are also getting enough air coming in. (Edit: I might have 1 for sale actually ran it 24/7 for like 3-4 months. No longer need the second one since I have 95% of my miners in a facility near by)

[PeaMine]

Well my testing shows intake temps cause large power increase.

67f=1365 watts
76f=1424 watts
81f=1484 watts


I was able to get same results with 2 different psus
And on 2 different pools.

I want to do an 86f room test next
Then a 91f

Thanks for this, I noticed this as well even with my 741s, though it wasn't as extreme.
I even kept the PSU at 25C by building a mini insulated AC rack out of Rigid Insulation, air filters and a portable AC unit.
The S9 and S7 don't seem to have this issue, which seems to make the A841 more efficient in lower temperatures only.
Once summer gets closer, this will most likely be a hot issue.

I sent an email to Steven, let's see if they have some lab test info or etc.  which could help to specify the A841 technical specs more accurately.

Hi HagssFIN - Been a week now... have you heard anything back from Steven?

Was curious about this as well.  There hasn't been a single post in the Blokforge thread since the 21st and Minerwarez since March.
I miss being able to buy from and recommend Canaan over Bitmain, so hopefully this can be resolved soon.

[philipma1957]

https://www.youtube.com/watch?v=fvWXJTYrW9o

Have found a solid under clock thanks to megaquake .

see youtube above.

this makes the miner viable if you are not mining in the tropics i.e. constant 80f temps will hurt miner all year round.

I am in NJ USA  

7 cooler months means it is better then spec for those 7 cooler months.
5 warmer months it is worse then spec.

avg out to a little better then spec.

if you are in Finland and air cool  it should be fine.


Moderator's note: This post was edited by frodocooper to remove an unnecessary quote.

[ccgllc]

Now that our early spring temps are gone, and with the downgrade of the specs on Avalon 8s, I've been paying close attention to the reported temps my machines are running at.

I have (3) AUC3s full:  10 on a lower shelf (5 with APW3++s and 5 with Sorcerer PSUs) and 5 on a shelf above those with APW3++ power supplies

For some reason, unit #7 on the lower shelf is running 4C hotter than all the others.  I checked, nothing is blocking the intake or exhaust.  

Any ideas?

Oh. FWIW, I just separated my Sorcerer PSUs and put about 2 inches between them and the their 841s.  Noticed those puppies are hot!  Figured if nothing else it would help mix their exhaust air with room air a bit.

[ccgllc]

How did you do that?  Because if you just selected -1 in the web UI, that didn't make the change, you have to add the "--avalon8-voltage-level-offset -1" string in the more options line in the configuration the 0 - zero option is hard coded no matter if you selected the -1, -2, etc or not. ... little known detail.  BTW, from 0 to -1 on mine will show an approx .150-.2 Th drop per miner in the rate, but the outlet temp will change by a couple of C too

Finally got around to adding this line.  Seeing very similar results, e.g.  No substantial change.  I'm a bit confused though, when I look in the process list I now see:

Code:

cgminer --lowmem --avalon8-fan 10-100 --avalon8-voltage-level-offset 0 -o stratum+tcp://stratum.kano.is:3333 -O ccgllc.Pi3a:pass -o stratum+tcp://stratum.slushpool.com:3333 -O ccgllc.Pi3a:1234 -o stratum+tcp://profit.pool.bitcoin.com:3333 -O ccgllc.Pi3a:X --api-allow W:172.16.4.0/22,W:127.0.0.1/32 --api-listen --avalon8-voltage-level-offset -1 --real-quiet

I'm presuming the first instance of offset is hard coded and hopefully being overwritten by the second instance?