Avalon 8 official specs released - page 6.

ccgllc

copper member

Activity: 658

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Math doesn't care what you believe.

Quote from: philipma1957 on May 11, 2018, 11:16:12 PM

Quote from: ccgllc on May 11, 2018, 10:50:43 AM

So far I've only lost (1) APW3++ power supply - a fairly new one (weeks old). Might have been to heat, might not, but the Avalons are hanging in there. I am running with option:

--avalon8-voltage-level-offset -1

Which is reported to help with heat at the cost of a small bit of performance.

- -avalon8-voltage-level -1
—avalon8-voltage-level -2
—avalon8-voltage-level -3
—avalon8-voltage-level -4
- -avalon8-voltage-level -5

All work and allow safe running in a hot room.

They all drop hash and watts try -3 or -4

Yeah, we have had this conversation already.

philipma1957

legendary

Activity: 4256

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'The right to privacy matters'

Quote from: ccgllc on May 11, 2018, 10:50:43 AM

So far I've only lost (1) APW3++ power supply - a fairly new one (weeks old). Might have been to heat, might not, but the Avalons are hanging in there. I am running with option:

--avalon8-voltage-level-offset -1

Which is reported to help with heat at the cost of a small bit of performance.

- -avalon8-voltage-level -1
—avalon8-voltage-level -2
—avalon8-voltage-level -3
—avalon8-voltage-level -4
- -avalon8-voltage-level -5

All work and allow safe running in a hot room.

They all drop hash and watts try -3 or -4

frodocooper

sr. member

Activity: 351

Merit: 410

Looks like Canaan are looking to revert the A8's target temperature back to 90°C, according to commit ae73ff0 in the avalon8-dev branch of their cgminer repository.

ccgllc

copper member

Activity: 658

Merit: 101

Math doesn't care what you believe.

So far I've only lost (1) APW3++ power supply - a fairly new one (weeks old). Might have been to heat, might not, but the Avalons are hanging in there. I am running with option:

--avalon8-voltage-level-offset -1

Which is reported to help with heat at the cost of a small bit of performance.

PeaMine

hero member

Activity: 979

Merit: 510

Anyone else having issues with their 821 and 841 now that it has warmed up a bit?
It's around 36C, which was the operating range when I purchased these, and some are able to handle it, but many are restarting every hour or so and hashrate has dropped around 8% lower on the miner status screen and around 14% lower on the pool.
However power usage has not decreased.
I highly doubt these will survive summer or be able to operate.

Sometimes they completely disappear from the controller but still seem to be using power but producing nothing.
Is there a way to fix this?
Due to all the restarts and possibly bad boards I'm currently averaging 8100GH per 821
I powered off my 841 for now while I wait on a reply from support as it was unable to stay online for more than a few minutes.

ccgllc

copper member

Activity: 658

Merit: 101

Math doesn't care what you believe.

Just noticed that Canaan slashed the prices of Q60 841s to $1120.

Nice to see them competing with the "new" Bitmain S9+.

fccs

member

Activity: 356

Merit: 47

Yea the majority of places in the USA will hit temps above 30c during summer at least a few times. Mine have been doing ok so far and even with the temps being about 90f the last recent day, my airflow in my location is good enough that the machines didn't shut down or restart once. (Although probably came close to it at the 100-103 mark)

PeaMine

hero member

Activity: 979

Merit: 510

Not sure why Canaan didn't post here as well about this, but a partial explanation on why the operating temperature range was changed to 30C from 40C
https://bitcointalksearch.org/topic/m.36259525

In which case it would be wise to mention this on the official specifications and send out an email to clients who might be affected, explaining this intent.
Now that the weather is starting to stay over 30C I am seeing a 6.5% drop in efficiency already and it is still Spring, even with -2 selected for voltage offset.
Without the -2 voltage offset, they get way too hot and reboot themselves frequently.
Summer is going to be interesting.

HagssFIN

legendary

Activity: 2464

Merit: 1710

Electrical engineer. Mining since 2014.

@ccgllc
Yes, it gets overwritten by the second instance which you have inserted in the 'More Options' field.

ccgllc

copper member

Activity: 658

Merit: 101

Math doesn't care what you believe.

Quote from: akadamson on April 25, 2018, 01:58:04 PM

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?

ccgllc

copper member

Activity: 658

Merit: 101

Math doesn't care what you believe.

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.

philipma1957

legendary

Activity: 4256

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'The right to privacy matters'

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.

PeaMine

hero member

Activity: 979

Merit: 510

Quote from: philipma1957 on April 29, 2018, 03:04:58 PM

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.

Quote from: ccgllc on April 29, 2018, 05:23:19 PM

Quote from: HagssFIN on April 22, 2018, 11:30:26 AM

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.

taserz

sr. member

Activity: 800

Merit: 294

Created AutoTune to saved the planet! ~USA

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)

philipma1957

legendary

Activity: 4256

Merit: 8551

'The right to privacy matters'

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.

HagssFIN

legendary

Activity: 2464

Merit: 1710

Electrical engineer. Mining since 2014.

Quote from: ccgllc on April 29, 2018, 05:23:19 PM

Quote from: HagssFIN on April 22, 2018, 11:30:26 AM

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.

ccgllc

copper member

Activity: 658

Merit: 101

Math doesn't care what you believe.

Quote from: HagssFIN on April 22, 2018, 11:30:26 AM

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?

philipma1957

legendary

Activity: 4256

Merit: 8551

'The right to privacy matters'

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

Didley1JT

full member

Activity: 140

Merit: 100

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.

Thetaj

full member

Activity: 402

Merit: 116

Quote from: Shazam!!! on April 25, 2018, 03:16:05 AM

Quote from: Thetaj on April 25, 2018, 02:30:13 AM

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

Topic: Avalon 8 official specs released - page 6. (Read 30297 times)