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I would tell them to bugger off and use a different Exchange.
Aside from AML KYC, all Coinbase asked is what is the main source of coins: Mining or trading? To me that is more than fair as it lifts any flags about new coins that are generated by mining (no output address) vs 'recycled' coins obtained by trading/buy/sell.
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Odds are that it was not the supply itself that caused the damage but rather worn out PCIe connectors pins on it and/or the miner. Connector pins are good for surprisingly few connect/disconnect cycles, typically I see ratings as low as 25. After that the plating wears off and spring tension drops leading to poor connections. Once that starts things avalanche to burned plugs rather quickly.
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Well do remember that the stock fans are rated to pull 2.5A each @12V = 30W each.
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Just bought a Avalon 821 and it's not linking up with my other avalon 741's? Even tried it on it's own uac 3. Anyone know the reason? Goes from blue to green back to blue?
Um, perhaps read the 1st few pages of this thread? The A8xx uses different controller firmware than the A7xx series and the 2 versions are not compatible... A821 controller image is here: https://canaan.io/downloads/software/avalon821/openwrt/20180305 from there pick which flavor of RasPi you are using and burn the image to the controller sd card. |
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Not a bad idea. As long as the systems can produce the needed pressure to push the airflow needed any blower can work and will be far quieter than the 120mm high pressure fans that BM and others use.
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Not only build quality but also quality of hash results: Kano has banned the earlier Ebit miners due to very very poor results vs just about any other miner made.
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Also, note he 4 pin for the control board
Ja. looks to be like the 4-pin aux CPU power connectors which makes sense as their psu puts out 12v@10a as the 2nd output. No doubt the high current rating is for the fans power draw. My guess is that the hash boards use the raw DC (14.5-15.5v) to directly drive the ASIC strings with no intermediate regulation. |
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DO pay close attention to the power specs for this! The miner CANNOT use a normal PSU. It requires 2 different voltage inputs, one for the control board and a higher voltage one for the hash boards.
From their site:
3. If the voltage for the miner’s control board doesn’t range from 10.8V to 13.2V and the voltage for the hash boards doesn’t range from 14.5V to 15.5V, the miner may fail to work or even breaks.
If you look at their PSU for the miner it is dual voltage out...
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From what I heard the hashrate of Avalon A911 is 18TH/s @ 1440Watt.
So the selling point for the 911 will be it using a longitudinal fan that should be fairly quiet (eg aimed at home use) like the old BM R4's? |
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Ah, 480VAC -- not 408 as you originally posted.
Ja for that you definitely need a transformer to bring you down to 208-220v as 480v 3-phase puts phase-to-neutral voltage at nearly 280v. Again, for distribution panels feeding only 208-240v miners, fan motors, whatever, then you do not need to run a neutral wire to them, only need the 3 lines and ground. Only panels that you want to split off 110v need a neutral wire.
For what it's worth, 380-410VAC is a recognized voltage standard for various parts of the world hence the initial mixup.
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if it comes to it and there is a need to show that the miners do not affect production - not sure how anyone with common sense would think that they do though - then I will shut them down.
If you do then I suggest you replace the load with electric heaters. That way you are comparing the same verifiable power consumption to any changes you see. Of course since kwh is kwh regardless of what the load is you should see the same numbers. And before someone niggles, miner PSU's use power-factor correction circuits so they are NOT a significant reactive load which is different than a purely resistive load like heaters. Yes slightly reactive but typically corrected to better than 99% of 1:1. |
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Unlike Avalons, BM miners have no tags like that. All you can do is give them descriptive pool/worker names from day-1. eg Fuzzy.Ant78S9B23 is my 78th Ant and is a S9 from batch-23.
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BM is no longer the 'leader' for miners. Canaan's Avalon 841 (16nm and very reliable) can be had for very good prices right now (under $450 USD) or get their latest A921 which is already using '7nm' chips.
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Who, lil ol' me?  Firstly, considering the amount of power you are adding I assume you ARE using a licensed electrical contractor right? If so - they already know what you need to have done and can explain it to you... Something like this is NOT for DIY! As Sidehack said, assuming you are getting wye (aka star) incoming service then you will already have 240VAC from each phase to the Neutral so that part is fine. If the incoming is delta then you will need a transformer to change that from the 408 delta to 208-240V and gets a little more complicated: If you do not need any 110v service then the transformer can be for 208-240V phase-to-phase with no Neutral connections From the incoming service entrance, split off into a few main 3-phase feeders @ around 250-500A each to feed distribution breaker panels filled with 20A breakers. As for balancing, as long as the breaker panels are mostly used only to feed miners and all breakers are same size they will balance themselves out as you add breakers. The slots go L1, L2, L3, L1, L2, L3, etc. |
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Welcome aboard!
Well damn - that pushes me down to #47! Seems we picked up several other folks as well as I had been banging around the high 30's...
That settles it. Time for me to pick up 2x A921's to swap power slots with 3x A741's for an 'extra' 20 or so THs and fair bit less power use ta boot.
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No, we're US based. Essentially the tariffs are to "enhance" US production, being there are only a couple manufacturers in the states having their support will bolster our position for exemption and may benefit them as they'll potentially need to source parts themselves from China.
That brings up an interesting query: Do the new 25% tariffs apply to any miner-related components made in China? eg, inductors, resistors, caps, etc. I know they apply to a helluva lot of optical components and laser diodes. If they do (or in the future, can) how it could effect Non-China based companies that offshore production to China? CoilCraft (US owned) comes to mind for one, they make high current inductors as seen on all hash boards. Wonder if they would be exempt? |
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on a total side subject can anyone tell me how to create a signature here? I see people with them, I have looked thru the profile settings and I must be blind because I do not see it. Let me rephrase - I see it in my profile, but I see no way to edit it. rather than derail this thread, can send me a pm as well. now, let's get more blocks!  You need more rank. ref https://bitcointalk.org/index.php?topic=1689727.0Mine on! I got the 1st block for us this month, time for you slackers to pick it up!  (JK of course) |
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Block by Fuzzy,2 h ago!
This is our 1st October Block,and our 1st of Block Monday!
Yer quite welcome. My block#7 was found by the R4 office heater   I might add that of 3 R4's , that is the only one fully working. My 1st gimpy 1 that lost a card donated its controller to R4 #2 whose board died last August. That recipient seems to have had rejections issues as now it has lost a hash board as well so now Gimpy-1 now will give up it's last working board to Gimpy-2... |
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You are mining dust... AFAIK it takes at least 1THs, probably a bit more, to be above the dust level. If by R-box you are referring to the video streaming device -- forget it. Read https://bitcointalk.org/index.php?topic=2415854.0 point-3. You log in with your user name - not email address. |
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