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my understanding is that the SP31 is limited to 1250W per emerson1200 if its on 208V power?
looking to squeeze some juice out of it to get past 4.7TH with 50C temps on the backside
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This is an awesome project. Thank you.
I would like to add something I noticed.
I was looking at my S1 boards and my BTCGarden board. They are pretty much the same thing. There are a few more capacitors around the chips on the BTC Garden, (that probably is there to handle the extra power they put through.), but my question is this. Why is there a central FPGA? I would understand if it was using the board as its own control, but it is running network and cgminer through a RaspBerryPi. It uses half the chips of the S1 and gets about double it's hashrate. I am presuming the kicker is the FPGA.
So...if we hook-up an S1 Board to and FPGA board and run it through that and reversing the cgminer that BTCGarden is using..could we possibly quadruple the hashrate of the S1?
(Ie: If the BTC Garden runs 1 board at 155Ghash with 16 chips and an FPGA...would it not go to assume that 1 Board of S1 with 32 chips and FPGA would go about 4 x 85Ghash or 340Ghash?)
BTW: BTC Garden is using an Altera Cyclone IV chip.
The s1 and the btcgarden use entirely different asic chips with different specs. |
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BumP for Christmas
210 euro for 300GH? you can get over 500GH of more efficient bitmain or spondoolies gear for that value (450GH S3+ is $200, 1.7TH SP20 is $700) |
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the SP units are in colocaion, would be far too loud for my local mining farm (about a 14kW winter capcity, 8kW summer)
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Interesting there are 3.1 days left to go
At present the calculation is negative we might be in for a second difficulty decrease (honestly was expecting a small marginal increase instead of it dropping a bit more downward)
Estimated Next Difficulty: 39,952,664,727 (-0.14%)
Saying farewell to 40 million.
I have been looking for this to happen. Just don't know if we are good for 1 or 2 or more jumps like this. If .3 watt gear can be built for good prices and if it goes to market in feb or march . we can all stand pat for a while. If will be interesting if .3 watt gear comes out in bulk at a good price. there is no question all the gear over 1 watt is leaving the network and getting replaced by .8 or .6 watt gear. This combined with the 350 usd price has really slowed growth. If good .3 watt gear arrives it may force out all the s-'3s this is possible at the correct btc per usd price. and the network will not grow that much. I replaced almost all of my s-3s with sp20's just easier to do. I kept my kwatts the same and boosted my gh a little. some may lower the kwatts a keep the gh the same. +1. My 1-1.2w/gh asicminer equipment will probably be unplugged the moment diff grows another 5%. Just put a trio of sp31 units online for just over 14th/8kW - as long as jumps stay <5% for a few more months or price gets up past $600 again |
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look into, i think Delta's, laptop/desktop external PSUs, they hit the 87-90% but they are a higher voltage DC.
There is also nothing wrong with using a PCIe power adaptor off a desktop internal PSU
Perhaps domestic drivers for LEDs would be a good choice - if they produce 12V and don't try to drive a constant current. Will do the study. Very interesting. 12V is also not a must. We only need to adjust the chain length. perhaps looking into 48V power supplies wouldnt be a bad idea? Effectively driving 4x12V chains in series. I imagine the lower currents in the PSU and lower change in voltage may give good efficiency and perhaps lower cost. for smaller miners though, 12V pcie connection is best. hobby mining isnt really meant for anything under 300W anyways, and there are some good, cheap 450W power supplies available in most countries |
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You know that you will not get back 90%+ of your cost likely I assume?
the cost to produce your own device (lets say you used asicminer chips to build something like the tube miner) is probably 5-10x more expensive for a small (<20) batch then buying direct, and will require soldering skills and equipment you likely dont have already
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Only way to ROI is to somehow get that S4 out of the service or Co-Lo and into cheap or free hosted electricity.
Those hosting/electrical/maintenance fees kill ROI from the get go. If it's possible (not recommending this by any means), you could stash it in IT office datacenter rack or cabinet, and hope no one finds out. If you don't have access to this, then you're shit out of luck.
If you do have access to free/cheap electric, then get that miner up out of there, put it in the cheap hosting facility, and mine for a couple months, then resell that ish on eBay to some sucka....boom Profit!
That unfortunately maybe the only way you break even or come close to profit.
with 7 BTC (~$2200) I bought 8T at hashnest. They charge around 50% fee, my return is about .05 BTC/day = ~$17/day = $510/month. If I had bought the hardware would required 4 S4 @ a cost of $4800 and a return of about .10 BTC/day = 3 BTC/month = $1050. Power wise I would be spending 5600 kw/h @ $.14 or $784/month for a net profit of . $266. not counting diff increases my ROI at hashnest is 4 1/2 month, with hardware ~18 month. O yes, it pays to do cloud mining, just not at the ripoff scamers at cex.io 5.6*24*30*$0.14= $564.48 - very close to the hashnext fees (about equivalent to $0.12/kwh) secondly, if you buy the S4 with coupons they are $800 each (plus shipping of ~$180). They have resale value even if not profitable. |
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If someone were truly interested in only securing the blockchain, then I should think that an old Pentium 4 machine mining BTC in the closet would be enough. Even though its hash rate is low, it is still an independent source of blockchain confirmations.
people who say things like "support the blockchain even if you are paying more for power than you generate daily" are dumb, and so is the pentium 4 example. The blockchain will not be even marginally more secure by the addition of a few GH, and its just pissing away money. fact is that bitcoin price is low right now, and its squeezing the budgets of miners and makes machines expensive in terms of what they will mine. The difficulty tapers out with no new growth as seen lately, and a trend is emerging where the difficulty increases are exceptionally low. If we see a few more low jumps then equipment that is profitable now will stay profitable longer. source: been mining for about 15 months, and am past 20TH right now. If i sold all my equipment at fair price, I would have paid for a $1500 electrical install, >$1000 more in PSUs/networking, and made several bitcoins profit. nothing massive, but still very good for a hobby |
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Can you confirm that site I am looking at to purchase miners is not a scamming site? That it is the real companies site? Also any idea how long shipping normally takes?
go with the Bitmain S4 - its the most likely to be profitable and has a PSU built in, at a reasonable price if you use a coupon. At $0.07/kwh you could turn a small profit on it, or at least break even. bitmain takes about 4-6 days from payment to your doorstep with UPS or DHL |
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looks like it will be right around zero. I think a lot of SP-XX units are getting in peoples hands and plugged in the last few days. |
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adapter boards work well also, depends if you prefer a $40+ board or doing it yourself with a little bit of wire and a soldering gun (takes about 30min if you are inexperienced)
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My new SP31 miner arrived today, very pleased with the performance, thanks Spondoolies! fired it up on default settings and it seems just as, if not more stable than my old SP10's.  http://www.rgspix.com/sp31.jpgYou can probably increase the power on those PSUs quite a bit. 1275 is pretty conservative. 1330W is about 90% likely to work without problems. If those are Emersons, I'd set it to 1350W and let it learn its limits. There's a good chance that 1350W will be below the limits, actually. Doing this will give you as much as 150W more power and possibly 200GH/s more hashrate. Also, at those temperatures, I find that the optimal fan speed is 70. The temperature at which 70 and 80 are equivalent is about 16°C for SP30s and SP31s. Higher fan speeds use power that could be supplied to the ASICs, so too high a fan setting actually reduces performance slightly. The SP35, SP10, and SP20 are more temperature sensitive than the SP30 and SP31, so they should usually be run with higher fan speeds when performance maximization is the goal. If you don't increase the power to 1330W or 1350W, then the optimal fan speed is even lower. At 1275W and 11C, you might be best off at 60. thanks for that, i'll look into it today when i go up to see my mum  so, i cranked it up a little. now running 4850GH/s (immaculately stable at that rate) and pulling only 0.55w/GH. i'll run it at that until I get a chance to take it to the unit with my SP10's - that's 400 miles away so hopefully i can manage to get there at some point before new year... very happy with these miners. The SP31 is indeed like the big brother of SP10, just as stable with a much higher hashrate and superbly efficient. well done on another fabulous product. So well within the +/-5% spec. Anyone managed to get an sp31 past 4.9th? What's the actual difference between the sp31 and sp35? Number of chips, dc/dc regulators, or something else entirely? |
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whats your resistance/voltage/freq/timeout settings like?
Ive found that 2.05-2.15 kohm is well suited to 206.25MHz/60 timeout, but it can vary a bit between boards.
im using 1k85 (aprox) because each blade is optimized by them selves to reduce HW running at 200 MHz/60 thats actually really helpful to know - I thought you were operating closer to 2k4 for some reason. that compares nicely against my finding that 2k1 is well suited to 212.5Mhz/60 and 2k is suited to 206.25Mhz/60 maybe i should push mine even lower then. i try to reach 0.75 v per chip, which is the optimal for this setting only problem i have found if you stack too many, you get a heat buildup and therefor slower hashing, so im taking my stack apart, and will try 2x5 stack instead (running in a warm room with other miners) why not just add a second fan to the stack, either side-by-side or as a push-pull configuration? that would probably do the trick. TBH i have found higher temps dont seem to be a big issue - I disconnected the fans on some of my undervolted/underclocked S1 units that were still in the original frame/heatsinks, and they peaked at about 58-65 C after maybe 20min, and seemed to hash just fine at that temperature. With the fans connected they run below 40C Once my standoffs arrive ill probably aim to get 48-54 C on the boards when stacked similar to your setup |
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Plenty of cables still in stock- these are perfect for running sp20 units, which can demand over 250w per pcie cable
Hello Klondike_bar, I sent you PM - with no response from you. I need 16 AWG cable with 6-pin PCI connectors on each side. How much will it be? sorry, thought i got back to you already. I dont have any of those in stock, but am getting a pile of them in my next batch (should be in my hands just before christmas) they will be slightly more expensive, about $0.20/cable more for most order quantities Thank you for reply, will come back after Christmas I also have a question - I have 2 HP ProLiant DL ML G6 G7 PSU 1200W - their outs are a blade? (not sure how to call this, similar to how cards are plugged in a motherboard in a computer) - is there a way to "convert" them to feed miners? I.e. somehow make PCI outs? Thanks again! often the blade has PS_on or similar sensing connectors (like the green wire on an ATX supply), generaly you need to solder a jumper witre between the pins, and then solder or otherwise bond the cables i sell to the connector blade |
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whats your resistance/voltage/freq/timeout settings like?
Ive found that 2.05-2.15 kohm is well suited to 206.25MHz/60 timeout, but it can vary a bit between boards.
im using 1k85 (aprox) because each blade is optimized by them selves to reduce HW running at 200 MHz/60 thats actually really helpful to know - I thought you were operating closer to 2k4 for some reason. that compares nicely against my finding that 2k1 is well suited to 212.5Mhz/60 and 2k is suited to 206.25Mhz/60 maybe i should push mine even lower then. |
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Buy him a decent gaming grade videocard. You can mine with a videocard, especially alternative coins. No, its not profitable, but pretty much nothing is, and the process is identical, so good enough for "educational" purposes. And maybe he likes to play games too . honestly - not a bad idea. Graphics cards generally are not profitable (last I checked my rig of 3x r9-270x cards, mining x11/x13 were making maybe $0.20/day each, at about $0.35 in electrical usage per card) - so it is losing money to run unless you get lucky on altcoin trading on the markets. in contrast, to be profitable in bitcoin (sha-256) mining, you really need to go big or go home (>$1000 investment) to get a product with reasonable chance of paying for itself over the span of about 6-12 months. For a smaller unit, the S3+ is your best bet, with a coupon (or found locally used) its about $180-220 after taxes and delivery. If you pay reasonably low costs for power usage it can probably come close to ~80% paying for itself over 6 months of useful lifespan. tldr; gpu = reasonable cost, more complex (fun?) to optimize and setup, least profitable unless you are really dedicated or a bit lucky, can be used for gaming once the novelty is gone small USB-connected ASIC = cheap cost, not too complex to setup, will not pay for itself (maybe $0.05 on the dollar), small S3+ miner = expensive, easy to setup, *might* pay for itself |
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whats your resistance/voltage/freq/timeout settings like?
Ive found that 2.05-2.15 kohm is well suited to 206.25MHz/60 timeout, but it can vary a bit between boards.
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how come the op isnt responding these comments?
probably busy taking pictures of all the terahashes worth of equipment.... *sarcasm* seriously though - the OP has not once provided any personal/corporate info or evidence of hardware. The company isnt registered, has no phone number, the owner doesnt exist, the address is fake, theres no proof of hardware. Anyone who can sell the shares and withdraw thier money should, because without new members joining the OP will stop paying out his ponzi funds and disappear. |
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I am looking for a miner for my husband for Christmas. He is very curious to see how the process works. He really isn't concerned about making any money. I was thinking about spending about $100. Thoughts?
Have u heard about cloud mining ? avoid cloudmining 1) it wont show him how mining works. 2) he wont have any physical hardware - just an account on a website 3) a lot of different cloudmining companies will be revealed as ponzi schemes in the next few months (PB Mining and cloudminr.io are at the top of this list) ps: the guy suggesting cloudmining has a perfect example in his sig - a barebones website with no proof of actual hashpower, and forum accounts going around soliciting inexperienced people to join |
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