If I'm thinking right about how they described the J/GH relationship at higher hashrates, 6-7W per chip is well below the expected upper range (potentially over 20W?). I'd guess the footprint is changed to something a fair bit larger.
The Antminer S7 is about 10w/chip. Its likely these would be a similar footprint, providing ~200GH |
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ok, so R15 = Rc1 in the datasheet, and C73, C75 would be Cc1,Cc2.
U2 should be a digital pot made by onsemi, then. In the cat51xx family
And that means that we could have some software control over it.
I spotted the 6k8 as being tied to ground.
I'll do a quick test on one board replacing the 6k8.
I noticed that without the controller plugged, the voltage output at the coil was closer to 8v, can't remember exact value.
And, it went higher to 10.2 with the control board plugged
8V would make sense for the sort of voltage you would expect without the shunting effect of the Digital Pot. So this implies that the PIC is being controlled or at least reset by the controller as opposed to it being completely stand alone as I had assumed? A trick to feed the chips with a voltage so low they won't start (burn the entire board) if the controller doesn't send a signal to tell he is ready with ethernet connected? Yes I guess it makes it safe. CAT51xx looks spot on against the pinout, not sure how that ties to AG30/ AG6K but guessing it's a 10K pot? I do not have sufficient info with just the pictures to suss out all the connections to the PIC, in particular any interface to the control board? Any chance the Batch8 is software controllable? digging around vi SSH (root/admin), found these references: etc/config/cgminer.conf: "bitmain-voltage" : "0706" etc/cgminer.conf.factory: "bitmain-voltage" : "0725" seems strange that they are different, yet still necessary to reference. Anyone know what voltage the B8 actually runs at? |
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Ok it's been about a month since I opened this sealed Titancoin. Titancoin claims it was redeemed using the original owner's email address, and that this person has either tampered with the coin in a perfectly undetectable way, or their system has been hacked.
Long story short, they seem to have decided that they are not going to redeem this coin for me, and now they want to pursue a criminal investigation and legal action against.... someone but they are not sure who yet.
All I know is I opened what looked like a perfectly sealed Titancoin for 1btc and I do not have 1 btc, instead I have a protracted argument and scam accusations *from* Titanbitcoin themselves. I would advise anyone who holds a Titancoin to redeem it now, if they can.
My options now seem to be to contact the police, to start a criminal investigation against whoever may have redeemed the coin, and possibly to contact the attorneys general of my state and Titancoin's state, to have them investigated for what I believe may be securities fraud. Titancoin decided to go this path rather than "split the loss" with me and pay me even 0.5 bitcoin.
So, you bought the coin from another party, NOT titanBTC directly? Obviously that introduces serious doubt as to what happened. What was the address the coins moved from? Its hard to make an accusation like this without sharing the address the coin moved from "Titancoin decided to go this path rather than "split the loss" with me and pay me even 0.5 bitcoin." If I understand correctly, you accuse them and offer to settle for 0.5BTC? |
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Good chip info. I never worked with the 55nm stuff, didn't even own any until a few months ago so I don't really know much about how they behaved.
55nm was great gear. the system provided chip-by-chip feedback that only spondoolies has been able to exceed (and took an extra year to produce). cooling the h-boards was easy with 120mm fans and you could easily apply stick-on heatsinks sourced from ebay/alibaba/etc to allow pushing well past 25GH/board (required pencil mod) |
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To everyone running bitmain 1600 psu, bladecenter, etc.....what are you using for surge protection??? I do not have prior experience with these types of psu but switching over and wondering how to do it correctly.
If you plan on adding more rigs in the future, a PDU is not a bad choice with surge protection built in. This will enable you to add more PSU's and rigs as well [Depending on your breaker, the voltage/amperage of the PDU, etc... Some have their PDU plugged into a surge protector. And then some have a PDU plugged into a surge protector that's plugged into another surge protector. Not many, but a few do this. As for what surge protectors they are using in front of their PDU's, I'm not sure. Maybe someone will chime in after a while. PDU is pretty much pointless if you use a 1600W PSU, since a 208V 15A circuit could only handle 1 PSU, and a 240V 30A circuit will only handle 3-4 PSUs (and thats near the safe limits). most PDUs are built with 10-20 outlets on them and as such offer no real benefit. better option is to either utilize a basic 208/240V surge protector and try to avoid using costly PDUs |
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Will be reopening the shop soon! The chip is crazy and amazing. Anyone interested in H-cards with 16nm chips?
Thats a name i haven't heard in a long time... Id love new h-cards! But at the same time I think an assembled, standalone unit similar to the S1 or S5+ would be great. keep the lightweight, barebones style, just include a basic frame to prevent wobbles and a pair of fan brackets I think it comes down to chip cost and overclocking feasibility. Gen1 could be pushed an extra 40% under the watch/modification of advanced users, or run with almost no added cooling (heatsinks or fans) at stock. |
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But in the same time first unit did an excellent ROI. My 25 GHS starter kit delivered 1-st of Sept 2013 made 4-5 times ROI by the end of the year  Also bought some chips and used assembly service for them 1-st gen Got 3-4 times ROI So in fact all my bitfury based gear made ROI Quite different times when ASICs fist came out back then, but that is good to hear they ROI'd so fast the first go round! I think the only reason he "ROI'd" is because of the run up in Nov 2013. He would have likely done waaaaayy better buying BTC In Sept and holding. I got a september kit and more boards in november and made an ROI (paid with $120/BTC though). I cant recall the exact numbers but i think i spent like $2900 (~25BTC) and the return was $6000 (~16BTC) over something like 14 months of mining (i didnt sell many coins above $700) which is pretty good considering it ran more efficiently than even an undervolted S1 sure, BTC investment would have been a better faster return, but i view mining as a leveraged risk. Hardware i bought when BTC>$800 made ROI (or very close to) because the difficulty stagnated with the dropping price, whereas holding BTC would have been 40-60% losses during that time |
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The chip is crazy and amazing.
pics or it didn't happen  *picture of hashrate graph*. Seriously guys, use some sense. They posted the first real life test results from an ENGINEERING SAMPLE and suddenly everyone is claiming they just deployed 100PH of them. It wasn't my intention to claim such. I'd love to buy bitfury stuff again, but we are not in 2013 anymore and the chip has to be really incredible to make sense to sell it to the public. Bitfury chips have been that way since gen1. rev1 (55nm)(Sept 2013): 0.9-1.2w/GH, improved slightly by the first ASIC string for bicoin mining. Sold as a barebones miner that was easy to produce and could work without heavy/costly heatsinks. about 2x the efficiency of the competitors rev2 (28nm)(Feb 2015): 0.2-0.3w/GH (4x gain), pretty much exclusively private deployment. about 2x the efficiency as the competitors rev3 (16nm)(Feb 2016?): 0.05-0.07w/GH (4x gain), hopefully they sell to public these guys have been the smartest group so far IMO, opting for high-density designs that run in string (less DC/DC components) and dont require heavy heatsinks, only a sparsely populated PCB. deployment to an immersion system would be fast for hardware like this, and the string design could allow operation from >12V power. I would not be surprised to see thier in-house hardware operating with 48VDC power supplies for density |
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wat the ༼ つ ◕_◕ ༽つ Batch 9 is out ! Whats this, shipping after jan 20th-30th, and price is 2.54btc. Ha! They have quantity discount...order 50 and get....0.01btc off trolololol. Why dont we just wait for jan 20th, and the price will be much lower I suppose, due to crazy diff increases that are coming...I just dont know what to think about this.
any interesting specs on B9? looks the same as Batch 8. makes sense since it can hit 4.7TH with fewer chips and similar efficiency than the earlier batches. I think if the difficulty moves >15% this jump, it will correct itself or have a small movement in the next period since 1w/GH gear will get squeezed out again |
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S7 @ 3.1BTC shipping 5 days after payment recieved is fool's gold!
Shipping from stock at what was at the time a price cut smacks of a clearance sale. The significance of that clearance by bitmain may simply be undermining a competitor or clearing space for the next generation BM chip. Either way, with the network diff they have to recoup as much as possible from their stocks before they become worthless.
I think the price is more a reflection of how much BTC has risen in value, rather than any fire sale. S7 have some way to run yet. Even with the Difficulty rises we are seeing and the halving still the best value for money miner on the market at the moment. Rich This. The price went from $1600 to 3.1BTC (~$1350), which is like 20% less. the next difficulty increase looks to be around 15%. and they apparently are caught up to pre-orders so can sell as fast as they produce. totaly reasonable IMO. at >3.8BTC for a batch 7 it was a simple no-go for me. At 3.1BTc i was happy to pull the trigger on a single unit to try out, and might follow up with a few more |
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What would be the shipping cost to France for 10x 24" PCIe LEADS ?
Thank you
i dislike shipping outside north america generally, since its expensive and can take several weeks to arrive. I can get an exact quote if you like, but my guess would be around $15-25 shipping and 3-4weeks to arrive |
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14awg wire is okay in itself, but as i said, the concern is that its putting about 200w through a single connecting pin on each blade, which is a bit high for my taste. better to spread it more evenly using a 6-wire PCIe cable and/or both connectors on each blade just make sure its clipped in securely and that the wires are not getting too hot and youll be okay |
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so you plan to power miners for only about 8hrs/day?
that assumes no sunlight at night
that assumes some days are too cloudy to produce more than 50% capacity
You dont seem to have planned this out very much at all, and will lose money due to down-time and possibly damaging your power supplies when clouds roll in and your voltage/amperage falls below the equipment requirements.
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LOL
I have a BFL 30ghs too, but I'm waiting on more cables to power it from the S3+ power supply.
It melted a pair of pcie cables already from my standard PSU.
None of these will ever ROI but it's fun to tinker with them.
I have 13 333Mhs block erupter too.
Final setup will change when I get the USB doctors,then i'll make a permanent holder for the compac sticks with improved cooling.
At the moment it's WIP.
I don't really care about electricity as I already have a bunch of computers running 24/7.
I also have 4 dual xeon servers and a 65Tb SAN array running once in a while (in the black 42U rack you see on the right in the photo)
that s3 cabling isnt really ideal - it looks like the pcie wires may only have 1(+) and 1(-) each (as opposed to 3&3). even if its okay for the cables, this puts a lot of load on the S3 as the power isnt very well distributed from the connection point. i sell pcie wires (16awg) and Y-splitters (18awg) in my signature link if you ever are looking for options |
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I'm home again and have tested my batch 8 with my "3 lower end server psu's" DPS-600s:
4110Ghs 600Mhz 1140W
4150Ghs 625Mhz 1200W
4398Ghs 650Mhz 1245W
4490Ghs 675Mhz 1285W
4700Ghs 700Mhz 1335W
Chips seem to like about 60c temp, I get less errors as reported by others. I have fans at 45% inlet fan at 3960, outlet 3720, I took some static fins away from exhaust fan. When I unboxed miner and left it to work for weekend speed was 4500Ghs with stock fan speed of 4600. Efficiency about 0.28 I get Bitmain powers next week and test again.
Thats good to see - efficiency is not terribly affected by frequency. (600GH/200W overall) |
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You're talking about an MSP. An MSP = main service panel. PANEL. MSB = main service breaker. All breakers are to be derated to 80% if used 100% for more than 3 hours, unless specifically rated for 100% use 24/7. Why do you need to know what page it is? Why are you so reluctant to admit that everyone is right and you're wrong about the MSB? (seems this isn't the first time you've argued about this judging from your earlier comment)
Instead of asking me for more proof and telling me you don't want opinions, prove to me that a MSB doesn't have to be derated. Your opinion doesn't count. I want cold hard facts as proof. Until then, please don't endanger people with advice that you're not 100% sure about, and please consider your own safety in regards to running your own MSB at 100%.
I agree with Prelude on this. 80% continuous load is the universal rule of thumb. just because a breaker *can* handle continuous 100% load, or rated to handle as much as >120% surges before tripping, does not mean you should operate at max. sure, the rules generally consider applications with longer, poorly ventilated wire runs (such as the walls of an older home), but if you care about safety you can just spend another $100-200 to put in an extra breaker and wire run. Its a lot better than risking >$50,000 in fire damage if something fails. found this: "If you have a branch circuit supplying nothing but �continuous loads,� then the minimum conductor size must have an ampacity of 125% of the load � 210.19(A)(1) � and the overcurrent protection must be 125% of the load � 210.20(A). Therefore, the breaker must be loaded to no more than 80% of its rating." |
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Would you take $650 + shipping (per miner) & escrow with Jonathan or OgNasty?
that seems pretty low offer, considering these can do 4TH@0.6w (wall) underclocked with PSUs included I assume they are worth closer to $1200/ea |
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Figured I'd post this here for people who don't follow the S7 thread. Decided to "make a thing" to power my S7s  . Hope some of you will appreciate this! 2X 2000w server PSUs sharing the load of the 3 S7s. Will shortly be replacing the PSUs with the 2500w versions since I'm actually pulling 4400w DC from them right now, which is 200w over their rating on each. I've adjusted the voltage output to 12.6v on the PSUs. what's the purpose of the busbar, and not just connecting the PCIe wires directly to your breakout boards? obviously the load-sharing provides slightly better stability/overhead, but for ~$20 of extra materials and at least an hour of added assembly adding another PSU seems simpler |
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The electricity cost in my country is 0.094 USD per KWH
and after 300 unit consumed the cost rise to 0.142396 USD per KWH
from 24 hours 18 hours of electricity will be used from govt electricity supply and rest 6 hours will be used from 2000 watt UPS.
so let me know how much btc i will be able to generate per day and per month?
regards
this isnt very ideal. 9.4c/kwh is relatively high, and 14.2c/kwh likely wont result in positive return-on-investment. using a UPS decreases efficiency, and isnt really useful for bitcoin mining. a 2000w UPS (assuming its 2kWh) would only last ~1.5hrs with an S7 attached |
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