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One CX750M sold, one left for $75, shipped to US
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I read back a few pages looking for information about changing the fans on the S5's but was unable to find any information so I am starting the discussion over. I received my 2 S5's yesterday and my parents promptly said "no" to the noise going on in the backroom from them. So now I need to replace the fans and my thinking was just to put 2 of them on either end like the S3 and call it good. I noticed on the controller for the S5, there are 2 4 pin slots so I figure this should be fine, but wanted to double check. I am thinking of running out and getting these today... http://www.microcenter.com/product/423765/Air_Series_AF120_LED_Red_Quiet_Edition_Twin_Packand putting one on either end of each S5, but they are 3 pin connectors, should that be fine or should I find ones with 4 pin connectors (I thought 3 pin can plug into 4 pin slots?) Also the airflow is 52.19 CFM, should that be sufficient to cool an S5? Thanks in advance, I appreciate all feedback They should run fine with two of those fans using the 3 pin connector, but you won't have speed control. Depending on your ambient you might have to throttle down the speed quite a bit to keep the miner cool. That was my thoughts on the 3 pin connector. Thanks for affirming. Forgive me for not understanding, but you say "throttle down" the speed to keep it cool, wouldn't throttle down refer to slowing the fan speeds, and raising the temp of the miner? My ambient temperature isn't high, and they are in a very large space to dissipate the heat, so I am not too worried about that being a factor, just confused on what you mean. Thanks for the feedback though. Sorry, I meant turn down the frequency of the miner. There's no provision for voltage control with the S5, so power use scales pretty linearly with frequency. Those quiet 52CFM fans probably won't be able to dissipate 500W even running full out without the temps going nuts, so you might have to turn down the frequency significantly to keep everything from getting too hot. Ahh that makes more sense, thank you, guess I will look for some fans with better airflow that are quieter. Thinking this one now... http://www.microcenter.com/product/405571/NF-F12_PWM_120mm_Case_FanThat should be plenty to have 2 of those per S5 not necessarily enough as that fan produces just 93CFM. I used NF-12 3000rpm Noctua fans at ~110CFM ($24.6) and they only allow for ~325/1070 Gh at safe 60C when used alone in push position. Added scythe ultra kaze (not PWM, ~$13) for pull and 337.5/1100Gh is possible at 60C, maybe even full speed if you have lower than 30C ambient ultra kaze somehow did not work for push. The whole setup is ~55-56dB, which is much better than default (more than 72dB). if you need screws for connecting pull fan, then go to metric screws section at Lowes and get M4.-0.7 (45 mm-will allow for grill). these fit very nicely. I am really looking for quiet fans and next on my agenda are delta AFB1212SH (25X120X120mm). these supposed to produce just 46dB with 113CFM-I will believe it when I use them. Unfortunately, they are available only for slow ship from europe or china on ebay or amazon. |
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Sold antminers
Still have two unopened box Corsair CX750M for sale for $75 each (shipping to US included).
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Is it safe to say anyone that is running their Sp2/3's at a data center right now, is losing money? (users with free electric not allowed to answer).
Usually you pay for hosting in advance. If you paid last May for a year of hosting, you're not loosing anything if you keep your accounts in BTC. If you pay monthly about $80/KWh/Month .. you're still making something .. With a SP30 on Eligius you're at 0.04734934 BTC/day. That is 1.42BTC in 30 days .. that is .. $311/mo, while an SP30 is about 3kW at the wall .. aka $240/mo. By now my SP30 made 9.19100781 BTC since powerup and I received about 2BTC back from SPT as compensation. Overall ~1 BTC more than I paid for it. It still has to run a while to cover the hosting .. or I might sell it for something and get the ROI. With another one on the paycoin route .. everything ROI'd already. this is a bitcoin-centric way of calculating things. try the same calculation in $$-it is worse. even if you use a mixture approach; $4500 for SP30 minus $800 compensation=$3700. ~$300 (hosting per mo, probably average number)X5=$1500 in hosting fees. $3700+1500=$5200 for 9.2 BTC maybe you can recover $1300-1400 right now $5200-1350 (average between 1300 and 1400)=$3850 in $$ expenses for 9.2 BTC essentially, you purchased your 9.2 BTC for $418.5 average. not the end of the world, but higher than current. |
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I get jealous some times knowing I can't buy the larger rigs. Even over electricity I'm more concerned about noise. Not a temporary fan change or a duct tape job, I do really need it quiet.
it mostly depends on your living situation and ambient temp in the "hashing" room. I currently have two SP20 (used to be three) and two S5 in one room, sitting on two circuits and hashing at 4.6-4.7Th. Sp20 are undeclocked at auto fan and fan 10 (third one was on auto too), S5 modded with Noctua NF-12 3000rpm (push, PWM) and Scythe Ultra kaze (pull, molex). power use-~2.5kw. This setup gives out a very modest noise level throught the house as i have two other family members and nobody complains about it. I wouldn't put this setup in my bedroom or office, though; I tried to put one machine in the office and it was brutal. |
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It's gonna be tough all round with BTC holding in the low $200's and diff looking like it's going up again  Its even tougher for ppl holding their miners hoping to get ROI. Phillipma's opinion does not count because he got "free" electricity with his rent. I feel bad for ppl who just bought some miners tho.... however, it is a good time to get *some* used gear at good prices. I pay $0.09 USD for nighttime and $0.13 in the daytime/peak, so am still somewhat competitive. and im hoping to move into ~$70/kw/month colocation very soon I am not aware of $70 colocation. Some come close, but most with long contracts. You probably would be better off by selling 0.5-0.65GH/w gear anyway and go for 0.2-0.3GH/w gear if and when it shows up |
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One unit sold (significantly higher than the price by publicly low bidding OP)
Still for sale any of the following choices:
1. one S5 plus two Corsair CX750M for $550 (in BTC), shipped to US
2. one S5 plus one Corsair CX750 for $475, shipped to US
3. one S5, shipped to US, $400
4. both CX750M, $150, shipped to US
prices are take it or leave it, as they are better than Bitmain, amazon, etc.
Both S5 and Corsair are in unopen boxes (never used).
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westhash.com p=0.016
nicehash.com p=0.016 >>>>>> try p=0.0159
kano.is
f2pool.com
antpool.com
small correction see the slight price difference avoids choice confusion on the softwares part. acutally use westhash first if western hemisphere and nice hash first if europe , asia , africa ,australia Thanks. That's a good idea. Since WestHash is closer to me, here's how I've configured my pools now: westhash.com p=0.0159 nicehash.com p=0.016 kano.is f2pool.com antpool.com Looks like I'm all set. At least until the next difficulty change and I have to recompute the profit constant. Of course what we need now is some event to drive rentals through the roof, like what happened with Paycoin  yeah but sometimes people do all the hash at a top rate for ½ a day you will pick up on that every time now. Need help understand NiceHash/WestHash... I'm running 3 SP20's and here is how my first 3 pools are set up: stratum+tcp://stratum.westhash.com:3334#xnsub PW is p=0.0160 stratum+tcp://stratum.nicehash.com:3334#xnsub PW is p=0.0159 My 3rd pool is a P2Pool pool. My question is, I have 3 miners, all set the same for the first 2 pools, but this particular miner is picked up by nicehash once every day or 2, but when I look at the " Price BTC/TH/Day", the highest price is 0.0137. So why is my 0.0159 getting picked up? And why not my other 2 miners with the exact same parameters? I'm so confused!!!  did you give each miner a unique miner name that fits their style (a different wallet or it should be miner's name following same wallet after period or _ )? |
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you must have low electricity cost. I am actually thinking of cutting down my home mining with ~10.5c/kwh power. |
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Another question...
How do you shut these miners down to say replace a fan or move the miner? Mine came with an antminer motherboard switch. Being a computer geek, I hate just cutting the power. Somehow it feels wrong, but is that what your supposed to do? Just kill the power either with the red antminer switch or the psu switch? Doing this a couple of time switching out fans to try them with temp control lead one board to not respond during initial boot. It was only after full boot and a restart that the board came back online. I can't find a shutdown or turn off setting anywhere, so how dose the rest of you power down your miner for either maintenence or changing a fan?
Unfortunately, the only way Bitmain gave us to turn them off is to turn off the PSU. Yes, it does seem wrong and I hate doing it every time I need to.  yeah, I don't like to do it too, however, there is some additional power in PSU to slowly ease miner off after you threw the switch-you can see it best if you have a fan powered by molex-it will be several seconds before it stops, so i don't think that it is such a big deal. |
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Back to fans. Noctura nf-f12 is supposed to be a quiet 120mm with speeds up to 3000rpm. From reading all this, noise is the issue but you have to decide if you want speed or noise. The faster the s5 hashes the louder the fan because in order to keep the s5 in working temps (below 60) you have to push a lot of air and have the s5 is an ideal location. If you want a quiet fan then you need to sacrifice hash speed because the air displacement from fan has to exceed the heat generated to keep the s5 cool. This has been my struggle.
But I can't figure out why the s5 needs to be below 60c? Most computers run at or over 60c. The over temp cutoff is software set at 80c. I do get some hw but over a 12 hr period and from what Ive read some hw is ok but when does it become an issue?
Noctua NF-12 description says 41db, but the actual dB emitting from this fan are more like 55-56dB at 1ft distance. It is tolerable in the same office at 2-5ft distance, but I would certainly not call it quiet. In another room 20 or more ft away-it is totally fine even with an open door (barely discernible) |
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This model implies that we are at or close to a low comparable to that of November 2011.
IF the trend continues, then yes, but there are no guarantees. something does not compute for me though, and that is the relentless drive down despite growth in use, etc, etc. I have been taught by my prior investments to not buy a depreciating asset because it can go to zero or close. |
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these fans use 4A of current-this is quite a lot. I am not sure that they can be run off of the 4 pin connector on the top of the miner-maybe someone can comment on this. they could be run from the PSU directly through molex adapter, but then they will always blast at the maximum speed (no PWM) |
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I just purchased 2 for 2.9 shipped. I am offering you the same. Don't need the psu
Thanks
this deal includes PSU, sorry. |
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I think it's one thing to put your money on something being successful in the future, and putting money you loaned onto something. Sure, you may end up as the winner, but you may just as well end up on the streets, like... literally.
I personally have never taken any loan because I hate the idea of being indebted. I have always maintained my personal emergency reserves so instead of loaning money I take it from my own reserves. That's why it's a bit hypocritical of me to suggest loaning. However, let every man decide for himself. If a man is destined to be poor then even the best advice in the world won't make him rich. If a man is destined to become rich, then taking risks is the fastest way to success. That so called destiny is nothing final, since it changes as you change yourself. To make a good investment you must first become the kind of guy who does good investments naturally. I believe the particular person who I encouraged to take a loan is on his way to become that kind of guy. He's reading the right books and he is thinking the right thoughts. The right circumstances are important too. Remember how Soros "broke the bank of england" for $1 bil in 1992. It was one of the most famous trades, albeit highly leveraged. They could have just turn the tables on him as they did with Hunt brothers silver "corner", but they let it slip this one time. Being in bitcoin is risky enough for me, i don't need to take loans to double up on this risk. |
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in my opinion if you limit both max power (too low) AND max voltage, then the machine cannot optimize chip voltage properly and is run (at least sometime) sub-optimally.
You guys should pressure Zvisha and Spondoolies to implement a proper gradient-free multi-dimensional optimization method in their software: http://en.wikipedia.org/wiki/Nelder–Mead_method Do not reinvent the wheel! Wow. Solid. |
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Any ideas how to get chip#2, #3 out of its slumber?
>snip image<
not sure why there is only 1mv difference between starting and max voltage for unit 2. Maybe increase to 5mv? are you limiting power as well? yes, I want to limit power consumption to 550Watt @ wall and maintain ~1.9GH/Watt. in my opinion if you limit both max power (too low) AND max voltage, then the machine cannot optimize chip voltage properly and is run (at least sometime) sub-optimally. |
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Any ideas how to get chip#2, #3 out of its slumber?
>snip image<
not sure why there is only 1mv difference between starting and max voltage for unit 2. Maybe increase to 5mv? It is also OK to have max voltage setting up to 10mv higher than your max starting voltage for the highest of your chips starting voltage. the other chips will adjust automatically, in my experience. are you limiting power as well? |
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u all must not watch the hashrate of them for the first few days, they go down a good 1-3GH / day.
I have 4 SP20's...
All of them run under 100C
I do know for damn sure if we could custom tune the frequencies these run at they would be much more effecient!
The BIST is far too agressive, at the first sign of a HW error it declocks them like mad. Its ok to have a few HW error lol!
The firmware behaviour doesnt try to get the highest / stable clock at a given voltage unfortunately it seems.
if you use auto fan and don't unnecessary cap the power to loops, then machine will bump the highest temp to 115C at your max voltage and you will get more speed. In addition, I find that sometimes it does go down a few GH in comparison with first hour, but then IT ALSO goes up if you wait for longer than 2-3 days, basically fluctuating in a long waves of +/-5 to 10GH or so. |
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Bumping
the price for new S5 is better than on Bitmain site, also savings on PSU
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