i don't see anything particularly wrong in my comment, especially since I have dB measurement included. Who is to say that Sp20 with fans at different speed would not produce waves that are out of phase with each other, but I digress.
Fan noise is 99+% a random mix of many frequencies that cannot be neutralized by anti-noise as there is not sync or phase. your db rating were from very different distances afaik. running sp20 or s5 with Scythe ultra kaze also does not make too much sense for me as that fan is 3pin and not pwm. next point is the hashrate: downclocked to 900 Gh/s you can make eiter s5 or sp20 down to 40db with 0.3A PC Fans an let them run in a living room. but at 1200+ GH they got to hot and I doubt you get it under 46db a little physics: db rating is not easy to understand. example: 1 sp20 = 55db ; 2 sp20 = 58db  doubling (independent) noise sources are always +3db regardless of the distance. if you double the distance your db gets down by 6 db. if you check that with db meter you'll not always agree, bit this is most up to reflections in smaller rooms. your db ratings were from 1, 4 and 10 feet. in theory 10 ft. db should be roughly 20db less than 1 ft. and the "human ear" is recognizing doubled noise in 10db steps but this depends a bit on the frequencies. It's probably a bit less than 10db. OK, I get it re frequency. I got less sound somehow anyway and when using a single machine the sound does not drop as fast as you posted (maybe due to reflections). However, you don't have to use a PWM fan. Instead, you can use a 3 pin fan, power it from PSU, then adjust frequency so the machine is not overheating (less than 65C for S5 or less than 115C for SP20). |
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Seems we are all in the same boat. But I agree to vote with your money... if I don't buy another its not the end of the world for me.
BTC price heading into better territories. Anyone want to make any bets Bitmain raises the USD price on the S5's again in the next 48 hours ?  To be fair, they didn't raise the prices. They removed the discount, though I have to say I wish they added more discount instead of removing them. Very fair point. However, by removing the discount, they are effectively disincentivising purchases at this time. For some reason this thought does not register, but it is a bit silly to immediately adjust the dollar price to any movement in BTC/$ ratio. Why not price it in BTC, then? |
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http://www.bitcoincharts.com/Blocks 340490 Total BTC 13.762M Difficulty 43971662056 Estimated 41786349117 in 214 blks >>>>>> ( -4.96%) Network total 279140.555 Thash/s Blocks/hour 5.32 / 677 s -------------------------- still lower then the estimate above. https://bitcoinwisdom.com/bitcoin/difficultyBitcoin Difficulty: 43,971,662,056 Estimated Next Difficulty: 41,767,820,825 (-5.01%) Adjust time: After 214 Blocks, About 1.6 days Hashrate(?): 276,705,290 GH/s Block Generation Time(?): 1 block: 10.8 minutes -----------------------------still lower then the estimate above. 3 blocks: 32.2 minutes 6 blocks: 1.1 hours Updated: 20:20 (3.0 minutes ago) Price is jumping as I type 264 usd they should have waited for ghash cloud shutdown before announcing the coinbase exchange; then we might have gotten -10% they will not shutdown if the price goes back to $320. |
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The 3000 rpm Noctua fan is actually pretty noisy, I've got two S5's with it on them. Don't know why but it runs at 2700 rpm on one and 1800 rpm on the other at the same temps. Mine are the 140mm with adapters which move even more air.
I know they are noisy but from what I have seen it makes a noticeable difference with the stock fan, am I right? No need for a second Noctua, one is enough for 325MHZ=1070Gh (certainly) and maybe even 337.5 (1100 GH) as long as ambient is below 25C. Second Noctua in pull position does close to nothing. It is ~56dB (at one foot distance), though, i don't know where manufacturers get the the bs number of 41dB CX750M works fine, it's a workhorse. i had mine working with S1, S3 and now S5. No problem, but it WILL use ~5% more power at the wall in comparison with a gold PSU, but it is just ~$2.6 more per month at 12c/kwh. |
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Interesting observation related to http://en.wikipedia.org/wiki/Active_noise_controli have three Sp20 and one S5 in the same room with S5 running with Noctua and Scythe ultra kaze fans (push pull). I suddenly realized that i have much less noise in comparison when I had just two Sp20 and one S5. Upon measurement, approximately same amount of noise is coming from each Sp20 at ~69dB and a little less (maybe 64db from S5 with two fans) with all measurements at 1 ft. However, at the door, just four feet away, the noise already drops to just 61 dB, which is a much faster drop comparing with a single machine. My point is that most likely some of these miners produce the "anti-noise" (see article). I set up (accidentally) my three Sp20 in such a way that one is at fan 10 (fixed), one at fan 6 and one at fan 14 (these two on auto). Right now with all four miners running, I have just 51dB ten feet away and can barely hear them- a great improvement. My point is that by having multiple machines at the different fan speeds they might produce a canceling anti-noise and the whole setup would be less loud (at least this seemed to happen in my case). My dog has ability to move and see at ultra high speed (at nearly 150 FPS). Thats my conclusion after witness him doge a light spark from my fireworks by bending down and lick his balls. Anything wrong with my conclusion? Should i test this with a Glock? PS. you didnt understand jack about sound wave let alone calling something "Active Noise Cancellation". Go to a Cinema, buy all the seats then start experiment listening at every seat..... Just another confirmation of my theory regarding the correlation between low trust scores and commentary that deserves to be ignored. i don't see anything particularly wrong in my comment, especially since I have dB measurement included. Who is to say that Sp20 with fans at different speed would not produce waves that are out of phase with each other, but I digress. |
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We have yet to see one niche of humanity take bitcoin as a primary payment alternative.
I think we do not see another big bubble until this happens (12 - 48 months out)
The next bubble will leave anyone that has ever sold ready to jump off a cliff.
I think next big bubble stops at 75,000. Why? because next bubble will have us all competing with everyone on the planet, not just a bunch of tech geeks. An 8 billion dollar market cap is a joke. A complete joke for the world's first real digital currency alternative.
Multiply by 100 and then go up from there. Bitcoin won't stop until it hits a trillion market cap, and will likely never drop below that again.
1 trillion =~$47619/BTC This makes sense to me (for starters) at ~10-15% of gold valuation |
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What are the 25 states, I wonder, and what the heck is the problem with the other 25?
My state (TX) is not on the list of USD wallet enabled yet. What gives?
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This is looking good for the next two weeks, exchange rate nearing $250 helps too.
Still worse than before the crash though True, but as long as the S3s that I bought in July and have ROIed twice over still keep making money I can't complain. probably true in BTC terms, but NOT in dollar terms. |
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Interesting observation related to http://en.wikipedia.org/wiki/Active_noise_controli have three Sp20 and one S5 in the same room with S5 running with Noctua and Scythe ultra kaze fans (push pull). I suddenly realized that i have much less noise in comparison when I had just two Sp20 and one S5. Upon measurement, approximately same amount of noise is coming from each Sp20 at ~69dB and a little less (maybe 64db from S5 with two fans) with all measurements at 1 ft. However, at the door, just four feet away, the noise already drops to just 61 dB, which is a much faster drop comparing with a single machine. My point is that most likely some of these miners produce the "anti-noise" (see article). I set up (accidentally) my three Sp20 in such a way that one is at fan 10 (fixed), one at fan 6 and one at fan 14 (these two on auto). Right now with all four miners running, I have just 51dB ten feet away and can barely hear them- a great improvement. My point is that by having multiple machines at the different fan speeds they might produce a canceling anti-noise and the whole setup would be less loud (at least this seemed to happen in my case). |
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If I am reading this right the fact that I need to pay for any hardware replacement past the warranty term implies I own the hardware, so when I decide to cease hosted mining is shipping included?
yes, you own the hardward, but if you want to cease the host service and ship the miner to you, you need pay the shipment fee. or you can transfer your miner to another guy who want to use our host service could you answer three of my questions above, please. Thanks. |
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I could host 2 more S5 in my office, but i need an almost silent fan solution.
Noctua produces ~56-58dB at one foot away when on PWM at 2500rpm, run at 337.5 Mhz/1100GH.
Scythe ultra kaze is ~60db at one foot away when powered by molex (no PWM).
one miner in office with Noctua is probably OK (bearable, especially if it is cold and it drops to 2200-2400 rpm), but NOT with scythe at 3000 rpm-sound is too annoying, but Scythe is OK in a room few tens of feet away. These are all actual readings, NOT some theoretical dB announcements from companies that are usually incorrect, as I found out.
If anybody had good results with a truly >=40dB fan-I am all ears. As an example-did anybody successfully tried Cooler master jetflo (2000rpm, 36dB, 95CFM)
I did not try delta because it is a good fan, but definitely more loud then those I already have.
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I am curious-what is the typical response time for support? Isn't Sunday a working day in Israel?
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Interesting offer, but three items are not described:
1. Access to miner interface (how it will be done).
2. Do you ship miners to owners at their demand, and if so, what is the price of shipping to regular indications, like US, for example.
3. How is the fee collected (daily, weekly, biweekly, monthly)? I prefer to pay fee in $$, not by taking my mined bitcoin away from my account. If so, how is this done?
Pending this, i am potentially interested.
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Gotta say Im impressed w/ the latest 2.6.9 firmware. I noticed a new stat on the stats page "wall watts" ... its pretty damn close to what my killawatt measures, how the hell does the the SP20 know what the PSU is drawing from the wall? LOL that kinda baffles me....
The voltage scheduling is neat.
For future releases, I would like to see improvement in wifi compatibility, my wifi dongle which is listed as supported chipset is not detected by the SP20 =(
Also whats the 8 mean for alt-bistword? What exactly changes in BIST when using that 8?
Also, curious is there a way or will there be a way to to hand tune running parameters, such as clocks ? So I can try to squeeze every bit of extra clock at a given voltage ...
I also thought that it measures it at the wall, but it is actually just a guess assuming 90% PSU effectiveness, hence I got a difference between an actual at the wall and what SP20 shows when i use bronze power supply like CX750M, but close to actual when I use Gold EVGA 1300. |
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A heads up to anyone in the US having these shipped via the new FedEx option to save a few bucks. I have been called/emailed multiple times today from FedEx asking what a 'Bitcoin miner' is. The latest is an attempt to have me fill out some FCC form (which I have refused to do.) I don't know if I will be receiving my shipment next week via FedEx. I will update the thread with results.
If you want hassle free delivery in the US, I recommend sticking with UPS for the time being.
what's a big deal with a form? It is basically an importer doc-it cost nothing. They only ask for it once-I did it for a competitors machine one time and then it was OK later on. |
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Biodom, where is the auto that you were posting about for upper volt limit? I upgraded to 2.6.9 but don't see it. I see a scheduling feature which is new.
Sorry, corrected typo, meant wattage plus I probably was not very specific: auto if for fans, of course, but if you set auto for fans and a certain upper voltage limit, then you DO NOT have to adjust upper wattage level since the machine will adjust each different loop at a specific voltage and wattage (as long as it is below your upper voltage limit). What I was getting at is that this (wattage) would be different for each loop and you won't be able to achieve this if you use limited power setting for watts (like 160-165 instead of 288) |
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Has anyone that has upgraded to firmware 2.6.9 seen slightly slower hash rate? I've flashed 6 SP20's and everyone of then is 10-20GH/s slower vs firmware 2.6.4. Just curious if anyone else is seeing the same.
choose auto at a fixed upper voltage without adjusting maximum voltage wattage(let it find the sweet spot), then you will get possible maximum hash at a lowest fan (after ~10 min)-to me this gave better numbers while underclocking than 2.6.1 (did not compare with 2.6.4) BTW-congrats to zvisha and team-this is a great addition to prior software. |
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Hmh so biffa write this :. Remuneration As a consideration for the Services the Customer agrees to pay to the Service Provider an amount of (the "Fee"): a. 0.446 USD per GH/s upfront b. USD 0.0015 per GH/s and day, deducted on a daily basis* from the generated Coins and this : Re: [ANN] Spondoolies-Tech - carrier grade, data center ready mining rigs Today at 10:38:37 AM #10931 So for me, to buy say the equivalent of a SP35 and host it myself vs cloud mining it SP35: $2235 + $150 shipping = $2385 5TH Cloud: $2232 + $2230 (5000 * 0.446/gh) upfront maintance fee = $4462 The difference is substantial and thats if you pay it up front. The "daily charge" of $0.0015/GH works out to $7.5/day or $228/month for 5TH and Tigggger write this : Today at 04:13:06 PM #10949 The $0.47 per GH is what you pay for the contract, the $0.0015 per GH is what you pay for the maintenance. Some more figures 5,000TH, costs BTC10.08540406 and makes BTC0.02499871 per day Which means if difficulty never rises again you are looking at 403 days until breakeven is reached. so does 5 TH/s cost 4462$ or 10,085 BTC ? Itīs diffcult to find out by myself when i donīt see a contract on genesis-mining.  guys, i don't get it why this is so confusing. Sp-31 is 4.9Th (i don't know how they will attune for +/-10%) so 4900X0.446=$2185 plus 0.0015X4900X30.5(days)=~224-225/mo. However, this setup will get you 1.72 BTC/mo with current difficulty, which equals $400, getting you just $176/mo "profit'. Esentially, you pay $2185 upfront, but get $176/mo (initially). To me, the deal breaker is that they will subtract BTC from your account on a daily basis. I don't care for such thing: bill my credit card or even bank account in $$, then i am OK, that is it would be the equivalent of slowly buying bitcoin, but to give out more than 50% of mined bitcoin defeats the main purpose, which is bitcoin accumulation. |
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Thx for sharing, nice work Guy  Actually, with all due respect, i think that Guy has a puzzling perspective as seen at the very end. He thinks (as many others as well) that small dumping by miners somehow creates a vicious downward cycle. However, right now this is just 3600 coins a day or 100K coins a month (measly $20 mil $$ in a month which is nothing in comparison with world debt and money issuance) while we already have almost 14 mil coins. If there will be more interest in acquiring these coins from the general public, miners selling pressure would be overwhelmed. When the balance will occur, i don't know, but it is certainly not permanent. Coins are not trading at high volume. That small volume controls the price of coins. If 100 million a month was spent buying coins for 3 months it would drive the market up a lot. that's my point exactly: selling from miners is miniscule (even at 100% it is just $20 mil/month, so it it has to be lower than even that number). To me it indicates zero interest from wall street in bitcoin as an asset, nothing more, but this could change. |
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Thx for sharing, nice work Guy Actually, with all due respect, i think that Guy has a puzzling perspective as seen at the very end. He thinks (as many others as well) that small dumping by miners somehow creates a vicious downward cycle. However, right now this is just 3600 coins a day or 100K coins a month (measly $20 mil $$ in a month which is nothing in comparison with world debt and money issuance) while we already have almost 14 mil coins. If there will be more interest in acquiring these coins from the general public, miners selling pressure would be overwhelmed. When the balance will occur, i don't know, but it is certainly not permanent. |
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