Is it possible to change to PSU efficiency in the formula that calculates "wall watts" ?
I know the preset one is 0.90, but mine are 0.93
If I can update that number in the firmware, I'd have more correct readouts.
0.93 is based on the official test of one unit, but of course can vary a little in reality and with PSU age. Do an interesting experiment: Using a KillaWatt meter test the actual draw. Compare that to SP20 software reported value. If we know the reference preset is .9 it would mean I would hope your KillaWatt draw would be less than the number advertised. I did all that for my PSUs, that's how I came up with the 0.93 value. Now all I need is to be able to update it in the the firmware, so its' calculations are correct. right now it is very close to (board1+board2+board3+board4)X1.1 just do the same and multiply by 1.07 instead of 1.1, unless it is a vanity thing (records of smallest watts, etc, but since it depends on PSU it does not matter anyway) |
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seems they want to price in BTC but adjust the USD price manually. Not sure why they do tha
You've seen what happens when the price changes once while someone is mentally locked into buying, imagine what would happen if that price kept changing every 2 minutes? this is economics 101, but seems to go over yours and BMT head: stable(r) price entices MORE buyers, unless buying is completely hopeless. yes, you could have 10% fatter margins if you jerk up the price, but you would have 30-50% less customers. Besides, if the price was moved up in response to BTC/$ ratio change, why it did not went down when BTC went from $310 to $250 this am? Answer this, please. |
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I got two SP20E, i have one unit that run rock solid and the other one i can see that CGMiner is restarting sometime. I saw like 2 times in the same hours and 1 more 12 hours later. I run CGMiner 4.7.0 Anyone else experienced the same thing ? Thanks  what version of firmware is it running on? |
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I haven't dug through this thread, but whats the best fan mod for the Sp20? if this lot on ebay sticks around for a while I might pull the trigger.
most people are probably waiting for 90 days warranty to run out before going all out with fan mods since the connector is non-standard, so no PWM. I haven't dug through this thread, but whats the best fan mod for the Sp20? if this lot on ebay sticks around for a while I might pull the trigger.
I run the factory one, my girldfriend is quite patient, but i have a separate room which I run two of them. one at 40% and the other one at 30%. I run the second one at 30% because he doing an resonating sound which is less present at 30% over 20 and 40%. (Meaning : "Wouannggggggg Wouannnnnnnnnnnnnng Wouannnnnnnnnng") It's ok outside the room but annoying inside. I concur with the 30 vs 20/40 observation, moreover i still think that having your multiple Sp20 hash at various (staggered) fan speeds feels less noisy (at least for me). |
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I hate to admit it, but Gates is completely right.
There is no question Satoshi is a genius, many aspects of his innovation are really remarkable, however Gates (who is very good at the implementation level) correctly spots the biggest issue with Bitcoin: that without a regulated third party it's not fit for trade and hard to integrate it in the existing regulated legal and financial structures. No wonder large adopters like Paypal and Microsoft use Bitcoin in a strictly regulated environment where the third parties can verify who is paying for who. In modern societies where drug traders, money launderers and terrorist organizations pose security risk from the state viewpoint only regulated financial instruments will be allowed by law enforcement, and therefore Gates very correctly states that it seems Bitcoin cannot be such financial instrument. What Gates said (despite what the OP states) nothing to do with privacy, it is all about the ability to comply with regulations.
In the meantime ignorant Bitcoin fanboys state that the lack of regulation what Gates points out is the strength of Bitcoin. In fantasy land yes, but in reality it is not. The reality is that without regulated third parties Bitcoin won't be able to succeed. Only regulated third parties can take Bitcoin to the mainstream ... which completely defies the purpose of the decentralized aspect of Satoshi's great innovation.
The thing is fucked up from wider integration and regulation viewpoint, so it is better we the Bitcoin community and investors listen to smart people like Bill Gates.
the highlighted is pure nonsense because of this http://www.npr.org/blogs/money/2013/04/12/177051690/most-100-bills-live-outside-the-u-slook at that growth in $100 bills, which are 2/3 OUTSIDE of US. Americans almost never use $100 bills, but there are $625 billion in circulation. http://visualeconomics.creditloan.com/the-value-of-united-states-currency-in-circulation/what do you think these bills are used for? |
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well, sorry to say that, but i was messaging and calling since 7pm israeli time (for the last 53 min) both support 1 and support2 and so far-no response. Checking. In the meantime email remo@ and he'll get back to you tomorrow. OK, great, thanks. |
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well, sorry to say that, but i was messaging and calling since 7pm israeli time (for the last 53 min) both support 1 and support2 and so far-no response. |
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when is a good time to try skyping support? I don't have good luck so far.
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Guy,
Is there any news on PickAxe? I really like the SP20 and SP31 and am very interested in acquiring more efficient mining gear soon.
I suppose more efficient gear probably won't be out until Spring 2015.
Patient my friend. it was spring in TX yesterday-72F/20C... i don't expect it until the last day of 1H or, effectively, July 1. |
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I also think that this is the turning point. It's one of the most solid exchanges to this point. And it's based in the US where people are in dire need of a regulated and legitimate exchange. Going down a mere 10% now is just a slight correction!  not available yet in 25-26 states, including mine. I am curious- what's the holdup? |
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how should I alter the PWM Frequency of a PSU connected 3-pin fan???
And what if room temp is increasing due to mining?
you don't alter the speed of the fan-it would stay the same, but you can adjust either SP20 voltage or S5 frequency until chips are at correct temperatures. many people here posted about using non-PWM fans in SP20 (and S5). In fact, SP20 has a non-standard connector, so you cannot use regular PWM connector without a rare adapter. |
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I saw the BTC prices this morning and ran to order 3-4 more from Bitmain. Then I saw the price rise.
Bitmain, just peg the price of the S5 to bitcoin already, because that's basically what you are doing anyway.
they can't do this, because once they saw the price in BTC, people would order much less because they can compare price with btc profitability calculator. This is pure psychology. |
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Answer to your psycology question is simple, I wonder why you could not figure it out. (and there-in lies your answer, thing is, can you figure that out?)
Lets be clear. I'm a huge fan of Bitmain's (still don't have a t-shirt though...) and look forward to purchasing more of their products, but this price maneuvering is unpalatable. Not trying to troll and derail the thread, but if you could kindly answer my simple query, rather than dance around the issue, I would appreciate it. Help me understand the psychology here. "If I was hesitant purchasing something at $341, why should I be less hesitant to purchase it at $370 ? Why would I have more motivation to purchase at $370 when it was just $341 earlier ? $310 a day before that."and while they raised the price in response to btc 250 to 310 move, why not drop the price accordingly if btc goes from 310 to 277? i say that bitmain needs to keep a fixed $ price and stop jerking it around almost daily-it only annoys people. |
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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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