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When I look at your pictures, it appears that your power supply is using one cable, with two PCIE connectore, for each hashing board. That would suggest that each power cable is handling roughly 270 watts. Are the PCIE cables or connectors hot when the S5 is running at full speed. That seems like it's about the limit of what you would want on a PCIe power cable, no? Maybe I don't really understand what a PCIE cable can deliver.
Just a thought.
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Regulators typically aren't designed to sink current, but to source it. The 5V buck regulators on our PSU boards won't work as sinks so getting 7V across the 12-5 on them doesn't work. An actual high-current rail on a PSU is probably more readily able to work with sinking currents, especially if the current is quite a bit lower than what it's capable of handling in output. It kinda depends on the topology of the regulator. I wouldn't trust most things to handle reverse currents near high enough to power an S5, even at 9V loads.
I've thought about doing the 36V chain also, but I don't have any string miners to test with. Four boards on a Prisma would do it, except you'd need level shifters for the serial lines, which could be problematic. S5 there's no trouble stacking, since the only IO is ethernet, which is an isolated line independent of local ground references. You couldn't put two boards of an S5 in series on the same controller without smoking the controller, but four whole machines should work fine.
We're working on a prototype regulator for adjusting voltages for string miners; hopefully we have some good numbers in the next week or two.
looking forward to results on that. BTW this tiny little piece of gear I purchased on amazon is a very nice fan controller. If I choose to lower freq to 300 and volts to 8> I would have a very quiet s-5 under 50 db running cool. I figure this small dc to dc converter can run 6 stock s-5 fans. Just to be clear Phillip, are you only applying the voltage regulator to the single stock S5 fan? This essentially removes the S5's control of fan speed and turns it into a manual setting on the voltage regulator? Any other fan changes involved? Thanks for your exploration of this area. |
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Just out of curiosity, how low has anyone taken the S5 frequency either for cooling or noise control? I don't want to make work for anybody, but I though somebody might have this already.
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For what it's worth, ZoomHash is still at $325 + shipping. They accept PayPal and Credit Cards. They claim 5 days shipping in the USA.
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BTC price is now well over $300 per coin as I type this. What a ride......  |
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So the net effect of this is to use a 120mm fan frame as a spacer between the original S5 fan, and the case itself? How did you stumble on this idea? If true, it's about the cheapest change I have seen mentioned for S5 fan noise.
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Is there a more specific reference than "the other thread"? A keyword, Id, or title perhaps?
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NOTE I HAVE PSU TO SPARE. So my argument is for me no one else unless you have psu's to spare
cloud mining is just wicked hard to make money doing.
I read the contract a few times and I do not like this line :
b. USD 0.0015 per GH/s and day, deducted on a daily basis* from the generated Coins
1000gh = 1.50 usd a day or 45 usd a month
if I downclock 1 sp20 to 1000gh I will spend 470 watts on my kwatt meter x 24 = 11.128 kwatts a day make it 12 kwatts a day or
360 kwatts a month 12 cents a kwatt = 43.2 usd a month.
I have the sp20 in hand I got one on ebay for 392 after discounts
There is a solid ebay seller asking 420 a unit or best offer.
so buying 1000 gh in the cloud from genisis cost more up front 446 or 469 vs 390-410
and more to run 45 usd vs 43.2usd at 12 cents a kwatt.
with one setup I have nothing ie the cloud contract is basically nothing . the other I have a miner.
the cloud 469 out of pocket then 45 usd a month
the ebay buy 392 out of pocket then 36 a month my power is 10 cents until summer rates.
So genesis is just too much money for me. If it were June 1st and my power moves from 10 to 16 cents yeah I may do it. not now.
I need to do better then buying one on ebay ..
which means under 392 and under 36 usd a month. with some kind of buy back after 90 days.==== this would equal the ebay deal not beat it.
These are my circumstances so I understand if you have :
A) no space
B) power over 15 cents
C) want coins + some type of mining
but genesis Just does not fit for me and does not fit until June (maybe).
One minor quibble. I don't think the fact that that you have a spare PSU really changes the thinking a whole lot. I didn't realize until this year that a solid, reliable, PSU is an actual investment that can last. You yourself have time and again re-used a PSU for a new generation of mining hardware. While it clearly costs money to purchase a solid PSU, it will probably retain it's value way beyond the ASIC hardware that it powers for a long time to come. Even if you spend say $130 for the PSU, in one year you will still have a PSU of significant value, either for further use, or sale. |
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This is patently incorrect. There is mining hardware that has been turned off and will never return to hash another hash. Truly old ASIC's and most GPU's are no longer hashing. While I am not predicting any long term decline in hashrate, there are short term drops, and I think we are seeing a moderating of the increases. There is mining hardware that truly get sold for scrap, never to hash again. The OP is correct that it takes quite a while for non-current and inefficient hardware to truly stop hashing. Predictions of "All S1's are no longer hashing" is equally false.
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The fact that one person got refunded, and made a small amount of money as a result of currency exchange and their holding his money for about 18 months hardly seems like BFL redemption to me. Also they do not have a competitive product in terms of price, efficiency, or hashrate.
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It's crazy to think it costs roughly 3 Bitmain Antminer S5's to generate 1 BTC a month. Each S5 costs 1.5 BTC, so about 4.5 BTC just to mine back 1 BTC in one month, not even factoring electrical costs, should tell you all you need to know right now about the state of mining. Man, do I wish I had a Hot Tub Time Machine so I could mine with CPU's....  It's actually a little worse than that since each Antminer S5 needs a power supply. Many folks already have those, but many do not. I'll bet PSU's would add almost another BTC to the cost (for the three S5's). |
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I think there is a big lag for significant hash rate to "disappear for good". I expect many big mining firms may well have negotiated a better rate for electricity, but with a penalty if they don't actually use the electricity they contracted for. Electric companies just love a predictable load. In that case, they may well lose less money by continuing to mine at a an operating loss. In general home miners aren't constrained in that way, but it seems unlikely we'll be able to detect home miners turning off gear. My miniscule 100GH/s will not be noticed, along with another 5000 folks like me.
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Since difficulty adjustments are based on the amount of time required to solve 2016 blocks, downward adjustments must happen less often than upward ones. If the time required is less than 14 days, then the difficulty increases. Only if it takes longer than 14 days will will the difficulty decrease. In a sense the difficulty rises faster than it falls. There may also be some other limitations, but just based on the "14-day 2016 block" plan it falls slower than it rises.
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Despite the Bitcoin price fall, there is one small bright spot. The difficulty rise may be near zero, with 12+ days to go:
Bitcoin Difficulty: 43,971,662,056
Estimated Next Difficulty: 43,794,012,725 (-0.40%)
Adjust time: After 1697 Blocks, About 12.4 days
Hashrate(?): 302,137,553 GH/s
Block Generation Time(?):
1 block: 10.5 minutes
3 blocks: 31.4 minutes
6 blocks: 1.0 hours
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When I went to the dustcoin calculator and plugged in 3800 watts, 6TH, and $.07 for electricity, it came back with $216 for "profit" for a month. I assume that is based on some Bitcoin price (unknown), and some difficulty (presumably current). That puts your "miner payoff" at least 15 months out, and that assumes no increase in difficulty during those 15 months. That's really not going to happen. That just further extends you payout to well over 2 years or more, quite possible "never". For those months, you are just paying off the miner, and nothing more.
This kind of math just really discourages mining as a way to make money with Bitcoin, certainly nothing like the $3000 per month you hoped. Sorry to be such a downer.
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Just to be clear Phillip, I assume when you say that you can "profit" at $180 and 70B difficulty, you mean an operating profit. That doesn't mean to suggest that you will be able to have also paid for the mining gear itself, does it? You will have paid for running costs, primarily electricity, and nothing else?
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Smart money says nowadays to just put that $1000 in a high interest savings account or CD.
If you're feeling froggy and believe in Bitcoin, then purchase about 5 BTC at this roughly $200 pricetag, transfer them in cold storage on a paper wallet or hardware wallet, then put them in a fire proof safe, wait 10 years, then pull them out to see if they're still worth anything once the technology matures.
Right now, BTC price swings in only one direction (down), so speaking as of right now, in 2015, BTC isn't a wise investment until the dust from all the growing pains settles...
This is probably the most accurate response. I know it's a downer to "not do anything with Bitcoin", but the present climate just doesn't support much else. The "Buy X coins and see what happens" is strictly a gamble. You could look before 10 years is up. but it might all be worth zero, or nearly zero, at the 10 year mark. Quite frankly I expect that it will be an easy decision in 10 years. If Bitcoin isn't well above $200, it will be closer to zero (IMHO). |
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I think it's important to remember one thing. The usual advice of "Buy Bitcoins directly" being better than mining is usually true. I think the actual more accurate advice is "If you are hell bent on squandering your money on Bitcoins, then buying is a less terrible way to do so." As we have seen in the last few months, and particularly the last 24 hours, "Buy and Hold isn't a winning strategy, it's a less losing one" I think the old adage remains in full force: Don't spend more on Bitcoin than you are prepared to lose. I didn't confuse "spend" with "invest". If for some reason I had $8000 burning a hole in my pocket, I most assuredly would NOT spend it all on Bitcoin. To me, $8000 is not money I am willing to lose at this time. Of course maybe you just won the lottery! |
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yes I read all of that, that's why I was posting the direct question to them on that. Its something that we learned very early on doing this in a containment situation, power efficiency is best spent getting larger air handlers to move the air, as opposed to letting the individual units run the 120mm / 90mm fans to circulate air. Plus if they do, the event I described above occurs, you end up with a massive blow-back that causes your units to cook.
In a non containment scenario, the airflow is just too difficult to direct most of the time and you end up having a lot of hot spots, even with moving the physical equipment around. I've been doing some consulting and looking at private firms designs and ways to improve them, that's why its really interested in everyone else design.
Not saying the design is flawed, more of saying that Bitcoin heat generation is very different than standard IT equipment to look at.
I expect Cointerra learned this in spades when they were using the C7 Data Center folks to host their equipment. It appears that classical Data Center management and infrastructure are not optimal for a Bitcoin mining operation. Way overkill in many ways, including costs. |
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Probably won't help if BTC remains at ~$188, as it is tonight.
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