Agree with all except: Add a quiet fan or dual fan setup, done. Speaking as a person who designs/builds high power electronics for a living, *why* do folks constantly seem to think they can make a better decision about cooling/fans than the OEM did? Canaan did even more research into that than Bitmain (who just went for brute force) did. Read the bit on Canaan's site about it then look at the innards of your 721/741 miner to find out how they reduced the noise. That said, as with Bitmains s7 on up and applying equally to the Avalon's, IF you are going to play with fans at least make sure they are rated to work against high static-pressure. Most lower noise ones are not and will not deliver enough or at best will deliver only barely enough airflow even with a miner throttled down. In short - expect marginal performance.... I agree they designed these things by default perfect for my setup and anyone who can tolerate expected fan noise. As stated I have no need for silent operations so don't have any first hand experience, but I do see people constantly underclocking/downvolting units, some for a living, for home mining and basically costing performance in exchange for lower fan noise, at almost any cost. I assume the openness of the Avalon compared to current options could dominate TH/Sound DB with some modding, software and hardware. R4 was meant to fill this void, but didn't do so great, high failure rate, and low supply. Still a market for it, just one I'm not really needing right now. |
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That is part of what I like about Canaan, so far they have proven themselves to be easier to deal with than Asus, Gigabyte, and Sapphire (All 3 GPU cards died even before mining, only 2 RMAs were passed and it was months of work).
I highly support GPU mining as well, looking into buying something well made and for GPU mining in a more elegant fashion than a rack of GPU raisers dangling and caseless motherboards.
Canaan took me about 5 minutes of work and not a satoshi out of my wallet.
Is this sustainable? I hope so, because I plan on sticking with them with this customer satisfaction.
A741 on 6.5cent electric is pretty nice, especially on a pool paying out transaction fees.
My failure rates with the S9 were about as bad as Philipma, and I know they take good care of their miners with lots of experience.
That's not good for clearing 100% ROI.
Out of 10 Canaan miners, 1 failure, (and before Bitmain has even responded to my delay PSU shipment which is another story), the replacement was shipped by Canaan.
I'll be out a PSU for them crazy enough, wasn't expecting it to be so fast.
Will power down a bad S7 for it.
Someone else may be better about sound mods, I know it could be better than an S7 or S9 with ease, but I don't care about noise. Though I have had an S4 before drive me almost insane with this ear piercing whine.
I replaced the fans in it just for safety, cooled it off a bit, maybe bad internals.
I bet the 721, if they have any more, would be amazing for whisper quiet operations, it runs very cool on stock settings.
In a 70F house, I bet with -2 volt you could make it idle at 30% fan, no more than a normal PC sound.
Add a quiet fan or dual fan setup, done.
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What is your ambient temperature?
You can use -2 voltage and with 28C intake it will run similar to a 290X reference model at 70% fan, if not less.
Under that temp, it really becomes silent.
You can probably force the fan setting, and also replace it with something more silent, but I have no need for low noise.
I have it hosted so I'm honestly not too good at this, but just checked and 290X at 70% is best I can do.
I could sleep with one in a bedroom, but not 9, though I think heat at that point would be the issue haha.
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Edit: Sadly with their rise in popularity, smaller clients have been pushed aside.
It has been over 17 days since ordering recently with no response, however larger clients are getting priority on orders.
It has left me quite embarrassed as I got some new buyers to buy up coins for the August 31st batch, all to be left without any response from Canaan so far.
I have covered their loses, but it is still a disappointment.
I also tried ordering from their reseller website, but they declined my order as well and cancelled it.
I would recommend avoiding Canaan if you value time and responsiveness, though I still stand by their hardware.
I first tried out the A721 with their Pi3 controller shortly after they announced it.
They contacted me about payment options, used btc, and had a tracking number the next day, it was already shipped.
I have had 0 issues with this setup.
I then purchased another 2 controllers, one as a backup, another as the main, and very slowly added A741.
There have been 3 MM Firmware upgrades since I got them, never really had any major issues with them, but hash rate does seem to go up pool side with each upgrade so far.
Once summer hit, I learned in my case it was best to set it to -2 or -1 on the voltage offset(easy to set via the controller GUI)
Speaking of which, it's a nice mostly stock cgminer install in the advanced area, I love this and all the advanced options. The initial GUI front end is very user friendly, but I like the advanced cgminer look.
Poolside rate after rejects is 7.2Ths on the lowest end on the hottest day(as they promised) and 8.4Ths on the high end when it's cool, this is without using +1 voltage (haven't tried it yet).
I had acquired 9 A741 over many months, all within days of payment were shipped very quickly, usually 5 days to my door.
I eventually had one Miner that failed to power on at all very recently.
I tried everything I could think of, but it did seem the Miner was dead.
I reported my findings to their support ticket page.
Showed a few pictures of the Miner, and with no fuss and agreeing it's most likely scrap time, a new miner was sent for free per their warranty.
I've never had that with a Mining company before, or hardly any other company for that matter.
Compared to my various S9 batches, it's obvious the A741 is more durable and more reliable.
All S9 still power on, but currently average 25% dead boards, many during perfect conditions.
Warranty was never valid or within the time frame.
Add on support and warranty, and the A741 is honestly the better ROI.
I am in no way paid, given special treatment or affiliated with Canaan.
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741 is handling summer quite well for me compared to my S7 and S9s.
Thermal monitoring seems to be very responsive, and whatever they're doing with auto-tuning is very stable and efficient compared to the S9.
S7 boards dropping like flies, while I've had to restart cgminer maybe 4 times in 4 months for the A741s for a couple "stuck" miners, which seems latest firmware fixes.
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I have only had a single failure with 741, and we're working on that issue together with quick responses.
My S7 and S9 rates are around 25% failure, much worse.
Never tried R4 or T9, and no desire to after the 741 came out.
The voltage offset feature is nice as well.
I hope they keep things open and transparent, we need more companies like this.
I want to buy some more, but waiting on them to drop the news about the 761 now.
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Block by mits9 with 114TH/s! Welcome to the Acclaim Board with your 1st Kano block!  S9v2 On the new node in Silicon Valley  Nice timing, the server's been mining for less than an hour new pivot in "Silicon Valley": Gilfoyle decides to mine bitcoin in the "server" room. Dinesh finds out, rats Gilfoyle to Jared, who reports to Richard, of course, but Richard is unconcerned, apart from Core dev using spaces vs tabs (or vice versa) In the end, Richard finds out that he could connect his mesh to btc mining machines instead of cellphones, but Big Head accidentally sits on a cup of coffee, spilling it over Richard's laptop with the the new code (unsaved). EDIT: to those who did not see "Silicon Valley", all above would sound as gibberish. Silicon Valley fan fiction, I'm down with that! |
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sooooo good news (at least i think it is)....i got the firmware with fan control  . i downloaded the variations a few mins ago and will check my s9's sometime today to get the one with the most problematic temps to see how much of a difference the fan control makes. i wonder if i will get that "sorry i was wrong" i was hoping to get?? pride is a great thing...but too much can ruin a man. How has it been running? I have about a 20% failure rate for the S9 boards, with summer coming up, I need all the cooling and downclocking I can get. Also, now that the APW3 is sold out, what should we be using for the S9? The 1300-2600 model is just short of powering 2 S9 properly on 220(It can, but at 100% usage almost), but a waste to only power 1. |
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I had a similar issue, my blockchain would stop downloading with no error. CPU, Disk, Network, all seemed to be idle.
I tried everything, the one fix for me, was to stop the bitcoin core program properly, wait a bit, restart computer, then try again.
It instantly sped back up and did the same progress it did in the past 12 hours, in about 30 minutes.
i7, 16GB of RAM, 512GB SSD SATA3, Windows 10.
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Thanks, tried 2 fresh installs,
Did you delete the blockchain or just uninstall and reinstall? If you only uninstalled and reinstalled, that won't help at all because none of the data is removed from the disk. on 2 different SSD, and version 13 and 14.1 with new wallets.
For some reason it just stops around April 7th 2015.
If you actually did a full resync where the blockchain actually redownloaded (and reindex does not do this, I'll get to that below), then this error is indicative of hardware failure. In that case, I suggest you run hardware diagnostics to find what is wrong. Also tried -reindex as well which re-downloaded everything, same issue, total of 5 block chain downloads.
Reindex does not redownloaded anything. All it does is reindex what is already on disk and then it will do the normal catch-up process with whatever blocks that you don't have downloaded. Reindexing is the process of building the databases that have all of the indexes of where to find blocks and transactions. It absolutely does not redownload the blockchain even though it looks like it. The only way to redownload the blockchain is to actually delete the blocks folder within the datadir and start Bitcoin Core. Nothing else will cause a resync; reindexing, rescanning, reinstalling, etc. will not cause a resync. I posted in that one persons thread because it seems to be an issue with the blockchain download, as the wallet version and drive doesn't seem to matter.
Could of course be OS related, so I'm going over that now.
His issue was completely unrelated. You clearly did not read the thread. I'm using the portable version with -datadir, all on a single SSD dedicated entirely to the blockchain, application, and all app data but nothing else. All data, hidden, application, wallet, appdata, etc, all were fully empty before proceeding. Manual backup of the wallet.dat and a dump as well. When I used -reindex, it re-downloaded the entire blockchain, twice. It prompted an error before re-downloading. Only solution that fixed it stopping on that one single block, was an OS restart after a proper shutdown of bitcoind. On my Windows 7 backup system, it never finished downloading the blockchain, same issue as the other person, but indeed, not related to this specific case. Still, two systems that have worked without issue for Core for over 3 years, same wallet file etc, chances of both messing up at the same time is quite odd. In regards to the other thread, I experienced the same issue they had on my Windows 7 machine: No error, no progress, just stuck sometimes. Other times it will error out with the debug code snip. https://bitcointalk.org/index.php?topic=1951354.0So I assumed that since 2 machines went stopped working with Core, on the same day after 3+ years, maybe it was related. Obviously not though now, as a restart of the OS fixed everything it seems and resumed progress. |
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I just restarted my computer, then tried to resume it.
It hung for a few seconds on the block it normally crashes on, then made it past it!
It's still going, so perhaps every X blocks, I need to restart when doing a full download?
Not sure.
i7, 16GB of RAM, SSD.
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You have a corrupted block on disk. This means that you will need to resync the entire blockchain. Delete the blocks folder inside of the Bitcoin Core datadir and then start Bitcoin Core and let it sync.
Thanks, tried 2 fresh installs, on 2 different SSD, and version 13 and 14.1 with new wallets. For some reason it just stops around April 7th 2015. Also tried -reindex as well which re-downloaded everything, same issue, total of 5 block chain downloads. I posted in that one persons thread because it seems to be an issue with the blockchain download, as the wallet version and drive doesn't seem to matter. Could of course be OS related, so I'm going over that now. |
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Edit: Fixed, had to restart OS every 30GB or so for some reason, as the block chain eventually gets hung on updating. Full fresh blockchain download was forced as well. I had a BSOD on 13.1, Windows 10 64bit Bitcoin Core, display driver issue, not the first time it has happened. When I tried to run it again, it syncs almost to about a few hours (back when it started) and then would say this error: https://github.com/bitcoin/bitcoin/issues/6528I tried a total reindex, dumped my wallet.dat and tried a fresh 14.1 install, but still getting this error in code. Very odd. Plenty of free space, no memory errors, modern updated Windows 10 64bit computer. 2017-06-06 04:32:08 Pre-allocating up to position 0x400000 in rev00253.dat
2017-06-06 04:32:08 UpdateTip: new best=00000000000000000fa971b5ffb1356cda3df57b58d24e148b309c3dbb42806c height=351176 version=0x00000002 log2_work=82.580196 tx=64812943 date='2015-04-07 22:41:08' progress=0.285647 cache=307.2MiB(152765tx)
2017-06-06 04:32:08 UpdateTip: new best=00000000000000000c802f81019bc47dceabe4cbc44595d23f69be34b14b5062 height=351177 version=0x00000003 log2_work=82.580238 tx=64814506 date='2015-04-07 22:59:48' progress=0.285654 cache=307.8MiB(154140tx)
2017-06-06 04:32:08 UpdateTip: new best=000000000000000008768a17383eb782f3cf20201dabe52632fb4a076fd7f117 height=351178 version=0x00000003 log2_work=82.580281 tx=64815111 date='2015-04-07 23:06:45' progress=0.285656 cache=308.0MiB(154526tx)
2017-06-06 04:32:08 UpdateTip: new best=000000000000000003942b65396a674ad467e9db6abd0c86301c00734f6cad3c height=351179 version=0x00000002 log2_work=82.580323 tx=64815840 date='2015-04-07 23:13:24' progress=0.285659 cache=308.8MiB(155062tx)
2017-06-06 04:32:08 UpdateTip: new best=00000000000000000ed0ac62cb58ba42e4275a158500615acf4bd92c888fc04f height=351180 version=0x00000002 log2_work=82.580365 tx=64817405 date='2015-04-07 23:37:07' progress=0.285666 cache=309.1MiB(156342tx)
2017-06-06 04:32:08 UpdateTip: new best=00000000000000000f9e71e350952890e95c9a3e285d127bc5925c757f077c3f height=351181 version=0x00000003 log2_work=82.580408 tx=64817407 date='2015-04-07 23:37:29' progress=0.285666 cache=309.1MiB(156345tx)
2017-06-06 04:32:08 UpdateTip: new best=0000000000000000004eb2ffd61c79d84837804cb6280e6a165f148019764ef3 height=351182 version=0x00000002 log2_work=82.58045 tx=64818449 date='2015-04-07 23:44:36' progress=0.285671 cache=309.5MiB(157207tx)
2017-06-06 04:32:08 UpdateTip: new best=000000000000000000910d55c5ded478ca02159b14691930243bd832b7740e01 height=351183 version=0x00000002 log2_work=82.580493 tx=64819196 date='2015-04-07 23:54:03' progress=0.285674 cache=310.0MiB(157791tx)
2017-06-06 04:32:08 UpdateTip: new best=00000000000000000843ce944e348501709c593c64be9adc41a869294cc1f8e9 height=351184 version=0x00000002 log2_work=82.580535 tx=64819412 date='2015-04-07 23:55:37' progress=0.285675 cache=310.2MiB(157892tx)
2017-06-06 04:32:08 UpdateTip: new best=00000000000000000a8ee45288116badf993fc2629323508c5de18d7dcb130df height=351185 version=0x00000002 log2_work=82.580577 tx=64820092 date='2015-04-08 00:03:53' progress=0.285678 cache=311.2MiB(159070tx)
2017-06-06 04:32:09 UpdateTip: new best=00000000000000000c39cf845bff6cf3e88d1cdf5a731939a331ec85dd27da50 height=351186 version=0x00000002 log2_work=82.58062 tx=64822107 date='2015-04-08 00:34:43' progress=0.285687 cache=314.8MiB(160562tx)
2017-06-06 04:32:09 UpdateTip: new best=0000000000000000142c1e2b3abce5e92bb5f5ce168d11c48ef429772e736485 height=351187 version=0x00000002 log2_work=82.580662 tx=64824267 date='2015-04-08 01:21:20' progress=0.285697 cache=317.1MiB(162732tx)
2017-06-06 04:32:10 Corruption: block checksum mismatch
2017-06-06 04:32:10 *** System error while flushing: Database corrupted
2017-06-06 04:32:24 ERROR: ProcessNewBlock: ActivateBestChain failed
2017-06-06 04:32:25 tor: Thread interrupt
2017-06-06 04:32:25 torcontrol thread exit
2017-06-06 04:32:25 scheduler thread interrupt
2017-06-06 04:32:25 net thread exit
2017-06-06 04:32:25 opencon thread exit
2017-06-06 04:32:25 addcon thread exit
2017-06-06 04:32:25 Shutdown: In progress...
2017-06-06 04:32:25 msghand thread exit
2017-06-06 04:32:25 Dumped mempool: 0s to copy, 0.010048s to dump
2017-06-06 04:32:25 Corruption: block checksum mismatch
2017-06-06 04:32:25 *** System error while flushing: Database corrupted
2017-06-06 04:32:26 Shutdown: done
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How loud is the 741 compared to the S3?
I retired my S3s last year and got out of mining for a while. Now I am considering investing some of my BTC in a new mining rig. I'm in a 2 bedroom apartment with electricity included and I have a 20 amp circuit I can put a miner or two on it. Not going to quit my day job, but my little pile of BTC from my last effort looks pretty darn good now.
TIA
With -2 voltage offset and a cold environment you can get it quiet. That's before replacing the fan, compared to an S3 stock. |
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are these 580s stock or is the modded thanks
What card make and model did you use, and any tweaking? Nice speeds! well, 17.5.2 works nice on 6 580 moded ASUS T8s and MSI X 8Gs. SAPHIRE Nitro +s 8G also ( thou Hynix memory ), Waiting GIGABYTEs... Would you say this is probably your favorite model? https://www.newegg.com/Product/Product.aspx?Item=N82E16814137117Saphire has usually done me the best in stability. Gigabyte I've had two fail, one just gaming haha. |
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Cool was just making sure it wasn't an issue on my side!
All good, Kano-san will fix it.
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Something wrong with the front end?
I'm getting a lot of 0GH rates for my miners, or high error rate.
Elapsed time for them all says 1m20s
Just before that, it said 2m10s but then it reset.
All within about 2 minutes time.
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...So 13TH, what would you recommend on a metered 4G connection?
A real ISP.  And a fiber optic one  Cheap electric and space, but, nothing is available. 4G is as good as it gets, and happy to at least have it as an option compared to dual dial up I was using... And 13TH is just for example, is there a way to transmit less packets and thus save bandwidth by forcing a very high difficulty? If so, what is good for 13TH? |
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On setting the worker difficulty manually, isn't it idea to have around 1 share every 3-5 seconds?
I am using a 4G Mobile Hotspot, and some how using a ton of bandwidth from mining, over 5GB in under a month.
Surely they aren't doing that much bandwidth usage?
I removed the manual super high difficulty setting I had, in hopes of only sending large shares, and did notice an increase in traffic.
So 13TH, what would you recommend on a metered 4G connection?
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are these 580s stock or is the modded thanks
What card make and model did you use, and any tweaking? Nice speeds! |
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