FIAT (that I honestly do not know what else to do with)
Boy I wish I had that problem. Right now I'm in the middle of eight practically-unfunded design projects. Listing those projects could probably solve that problem. |
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How silent are they asking those that bought it and have it, 52 db to me is not that silent.
It's silent if you compare it to anything in the same ballpark performance wise, but the machine has it's special quirks. 1) You cannot force the fan lower than 1200 rpm, if you use a low-noise 4-pin cable the controller will stop mining. This is really unfortunate as it would be completely silent at 800 rpm and still give ~4TH@300MHz! 2) The fan has irregular oscillations in speed/noise which are annoying to listen to. This is due to the low speed I'm running mine at and the fact that the fan roll is large and heavy. That said at high speeds it's noisy but VERY silent compared to anything moving the same amount of air. Basically it doesn't become louder when you spin it up, only the air blow noise gets louder and that's hard to avoid. All in all I'm very happy to exchange FIAT (that I honestly do not know what else to do with) for something that converts FIAT to BTC without KYC while heating for "free". Mostly I'll use this to maintain temperature during winter while I'm away, and then I'll heat with wood which is a sound I prefer to listen to. Edit: Variations can be reduced by the old classic "reduce vibrations through support" method. Fire hazard is better than bad vibes. |
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If you would want to underclock this alot could you use only 2 PCIE cables per board?
Apparently 40-45% custom fan speed is optimal, slow but not so slow there are annoying variances in fan speed.
Going to experiment with frequencies that would suit that fan speed, probably around 400MHz for longevity.
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@gt_addict That's an idea, just noticed the 860 has only 6 ports, the R4 requires 7 and the 1200 has 8... :/ maybe adventure on a splitter for the controller...  @tbonetony Too late, also I'm in it for the knowledge. You learn nothing by buying a heater and BTC except how miserable you become when you become rich or lose it all, lose/lose situation right there. @Unacceptable ROI is relative to the future price of BTC if you keep them. |
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I'm getting a Corsair AX1200i if my Corsair AX860 can't boot this to run it underclocked.
Expensive affair this, 1395$ + 25% VAT + PSU...
But free heat and anonymous FIAT -> BTC exchange makes it worthwhile.
Specially at peak lithography!
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Well they are not in the hardware business but in the Bitcoin speculation business but:
Bitfury 0.16J/GH
Bitmain 0.10J/GH
that's like 30%, in any normal business Bitfury would be dead in the water.
it's going to be around 1000$ 1395$
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Nice initiative, do you guys have plans for heatsinks to passively cool these underclocked?
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They will be on separate computers.
I can't do off-chain bitcoind account transactions since the other instance will not know about those...
I'm guessing I'll have to build my own account keeping and only use the bitcoinds for on-chain.
This must have been solved already by someone? Probably closed source...
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So I came up with this sort of distributed bitcoind, I have 2 bitcoind and I simply ask the other one to create the private key and send it (encrypted) to the first one which imports it.
But, I can't create "off chain" transactions this way. Does anyone have an idea of how you could do that with two bitcoind instances?
The only solution I have so far is to create the internal transaction system myself but I think it will lead to bugs and security problems.
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I have a chip I designed and fabbed through Europractice sitting in front of me right now...
I'm curious, are you building a 16nm miner? |
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Its funny how when this thread was created, all we were seeing were photos of GPU rigs, then photos of ASICs, and now we are back to photos of GPU rigs. Haha! You are forgetting that short but sweet FPGA time. I'm still burning those zTex x1.15 on Vcash, more than I can say about those 65nm ASIC! |
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Ok, seems it works fine if you start the bitcoind normally (= it downloads the whole chain on disk) and then enable pruning. Might be the amount of pruning that solved it, I used -prune=650 first time around, now I used -prune=10000. Seems to run fine... better hurry and boot/prune those bitcoinds before the chain grows beyond cheap SSD size!  Just a thought; you're using an SSD. Are you using discard on the mount options, if supported by your distribution? If not, are you using trim on the file system at regular intervals?
Ok, yes it's a SSD, but it wasn't slow; it was frozen! And if linux doesn't handle SSDs properly by default on recent versions I don't know what to say... It is connected via a USB3 -> SATA adapter though, maybe that's the problem? /dev/sda on /mnt/ssd type ext4 (rw,relatime,data=ordered)
What is the syntax for discard? mount -o discard /dev/sda /mnt/ssd
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@knightdk There was nothing in the debug.log at the failure time I checked.
@cr1776 Ubuntu 15.10, locally hosted? I guess yes!
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Ok, pruned is broken on 0.12. Nobody cares?... well when the blockchain reaches 100GB and can't fit on my SSD I'll throw a hissyfit like Mike Hern! To reproduce launch a new bitcoind with -prune=600 and let it sync, then reboot the machine and the bitcoind will lockup disk and the bitcoind process while verifying the block headers. It will take you 4 days to reproduce every time, enjoy! I'll copy the blockchain and prune it from this state to see if it works then... maybe this bug is due to the "prune from scratch" premise? How do you debug a process that freezes linux like that?! |
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I'm trying to run bitcoind pruned, the blockchain sync worked fine, and also once the sync was done bitcoind was running smoothly. But then after a reboot, when I start bitcoind it boots up ok and does it's thing verifying some stuff but then it blocks 3 cores at 100% io-wait and the disk is frozen (if I try to cat any file bitcoind is holding the cat process freezes) and I can't kill bitcoind?! Is anyone actually using pruned? How should pruned be used? What is prune=<n>? MB of what, how, where? I'm trying to reindex and run unpruned to see if pruned is the problem. Just have to wait 4 days! So bitcoind goes from taking 3 cores to 100% io-wait and locking these files: COMMAND PID TYPE SIZE MODE M START END PATH
cron 653 FLOCK 0B WRITE 0 0 0 /run
whoopsie 640 FLOCK 0B WRITE 0 0 0 /run/lock
master 864 FLOCK 0B WRITE 0 0 0 /
master 864 FLOCK 0B WRITE 0 0 0 /
bitcoind 2014 POSIX 0B WRITE 0 0 0 /mnt/ssd/bitcoin/.lock
bitcoind 2014 POSIX 0B WRITE 0 0 0 /mnt/ssd/bitcoin/blocks/index/LOCK
bitcoind 2014 POSIX 0B WRITE 0 0 0 /mnt/ssd/bitcoin/chainstate/LOCK
to having only 1-2 cores 100% io-wait and locking this when I try kill -9: COMMAND PID TYPE SIZE MODE M START END PATH
cron 653 FLOCK 0B WRITE 0 0 0 /run
whoopsie 640 FLOCK 0B WRITE 0 0 0 /run/lock
master 864 FLOCK 0B WRITE 0 0 0 /
master 864 FLOCK 0B WRITE 0 0 0 /
bitcoind 2014 POSIX 0B WRITE 0 0 0 /mnt/ssd
bitcoind 2014 POSIX 0B WRITE 0 0 0 /mnt/ssd
bitcoind 2014 POSIX 0B WRITE 0 0 0 /mnt/ssd
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Cool, exactly my use case, adding new addresses!
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But how does importprivkey work with pruning?!
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