Thanks for this thread. I won't have anything to contribute, but I'll enjoy following your progress and hopefully learning a thing or two.  |
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BITMAIN ANTMINER S7 Batch 8 with 4.73th/s
4.73th/s is the final version of S7 which is more stable. Shipping out within 5 days after fully paid. No more 162 chip versions confirmed.  |
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Damnit. I ordered a B8 yesterday for 4BTC. I have the worst luck.. Just emailed bitmain asking them to charge me 3.1 I stead and keep the 0.9 in my account to be used on my next order.
Dmwardjr, did the engineer come by and approve the upgrade?
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Might not be very safe wiring the outputs of two power suppiles together. Diodes might be in order.
They're made for it, so long as the load sharing pins are connected together allowing them to communicate with each other. Hmm, that's interesting. I have some of these left over from a Terraminer. Sounds like you can basically make a "2200w" power supply out of them.  Actually, you can make an 8800w psu out of them. up to 8 can work together in load sharing mode. |
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Might not be very safe wiring the outputs of two power suppiles together. Diodes might be in order.
They're made for it, so long as the load sharing pins are connected together allowing them to communicate with each other. |
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Let me know when you do, I might be interested in them.
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Why don't you travel with ID ? Just wondering
That way when stopped you seal your lips and silent treatment the fuzz and there is nothing they can do except beat you. Its just an opsec strategy i.e. no ID all cash swallow paper with wallets written on it proceed to detention refuse prints release from ice unit proceed to secondary opsec location and gather papers. I'm not disclosing any more of my intelligence. Those in the know in this field know it could get a little sloppy and at home mining is much easier then dealing with the headache of commercial. Also its kind of fun displacing humans with hobby equipment for profit. What kind of dystopian hell hole do you live in lol |
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So, I made another thing yesterday:     The 2 PSUs are PFE1100 units, pulled from an old cointerra IV box. Thy are really incredible little PSUs, 94% efficency at 100% load. Blows the socks off of every other PSU I have. Up to 8 of them can be linked together if needed, providing a whopping 8800W of pure efficiency. You may have noticed the the light gauge black and white twisted wires connecting to the 4th cube. Each pair goes back to a breakout board on each PSU. Their purpose is voltage sensing at the load, and allow the PSUs to dynamically adjust their voltage level to compensate for voltage drop across the wires. The 5 cube Titan (420MH/s scrypt, 1 dead die) makes for a prefect house heater. It's very quiet, which is a requirement with my better half. She didn't even realize they were in the house until she saw them! Temps have been warmer than usual, and these guys have been enough to keep all the heating in the house off so far. When it gets cold enough (below -5c constantly I guess) I'll bring in reinforcements in the form of a 6 cube Neptune. |
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Prelude I really like what you did there. When I use my 2000BBs stacked together I strap the fans using tiewraps and then my cables run straight off the GekkoScience break out boards to the miners, but I like your implementation of the separate connection bars. Once cable is only 12v, but you are gonna get a nice little bump if you short that to ground with a sweaty hand my man. At least run some silicon, or actually, you could put a small piece of cheap plexiglass across the top of the bus bars. Terminal strips that long aren't that expensive either, but I know if I'd built it I'd be happy and proud of not needing other materials. You probably had everything laying around Still though, some terminal strips with side guards would be a big bonus. It is a good looking setup though for 4k watts. I have half a dozen in the closet I need to make a project with. At the moment everything is running using the 2880s w/ Jabbers boards from Finsky. Sidehack and Finsky have both treated me well. I've never had a bad experience with either of them with transactions, or with Jabber or Gekko's equipment. I do like the options on the GekkoScience b/o board for the 2000bb as well. I think I am going to do what you did. I copy good ideas all the time and try to improve them. I'm really not worried about the bus bars. I've got 2 DPS2500s coming in today, turning the setup into a 5000W beast instead fo 4000W. Once they're installed, I'll be putting everything up on a shelf out of reach. If it was somewhere where kids or pets could get at it, I'd definitely cover them up somehow, but as it is they're in a garage where only I have access. They're definitely a pleasure to deal with, and both have great hardware to offer. I have a slight preference for sidehack's boards because they have a lot more options available on them, for example the load sharing, 5v for controllers, and fan headers with speed control. Make sure you send me some pics of your setup if you make one too!
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
I needed the bus bars to use load sharing properly, need a common bus between both PSUs to pull juice from them equally. I went with this setup because the loading wouldn't have been equal across both PSUs while powering 3 S7s. One PSU would've powered 5 blades while the other only 4. That would cause one PSU to be overloaded while the other one was under utilized. I guess if I had the 2500BB to start with, I wouldn't have bothered, but it was a nice little project that I enjoyed putting together. I learned from it, and the next one will be more efficient. |
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Anyone know why canaan has such wild hashrate swings? Seems to oscillate between 550-1100TH/s pretty constantly.
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I love those PSUs, I'm 20 of them. There's 2 models, RA and NA. NA sounds like a cat in a bag being kicked down the street, RA is much less whiny. Inaudible at 50% load or less, while NA is still loud at 20%.
I use 2 RAs with load sharing mode enabled in my house to power a 5 cube Titan space heater.
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I just dont get this
no blocks for over 10 feckin hrs
Only 7 blocks for the last 24 hrs
Luck reported by Slush for last day - 115%
?
The pool is broken, it's quite obvious. Time to pick another pool, at least until it's fixed. I made the move 3 days ago and am happy I did. |
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You sure you guys can't put a resistor between some of the pins to regulate the fan speed?
I'm sure it's possible, but I wouldn't want to risk them overheating. Modding 120MM deltas on top of them is probably the best way to go. Definitively do it this way. Even my Platinum server PSU heat up with their ear-rape fan at full blast. Modding them to use big fans would make then cooler and much more quiet. What platinum server PSU are you referring to? LOL at ear rape fan. |
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You sure you guys can't put a resistor between some of the pins to regulate the fan speed?
I'm sure it's possible, but I wouldn't want to risk them overheating. Modding 120MM deltas on top of them is probably the best way to go. |
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Is there anyone powering 3 S7 with this? Which fan do you use / recommend for cooling the PSUs?
I am. My own contraption, but the same end result as j4bber's breakout board. His solution is just much more elegant. I'm using 2 Delta fans, approximately 150CFM each. Could get by with lesser fans, but I had these on hand so why not. Sometimes, PDU's come into play. For instance, my 30 amp PDU's have two 15 amp legs. 15 amps x 220 volts = 3,300 watts. 6,600 watts maximum with both 15 amp legs combined. I'm presently using IBM 2880 PSU's to power 2 x S7's on each PSU. 1220 watts x 2 = 2440 watts. I might use 2 x IBM 2880's and 1 x Corsair AX 860 on one 30 amp PDU to power 5 x S7's instead of using only 1 x IBM 2880 alone on each 15 amp leg of the 30 amp PDU. However, more than likely, I will end up powering only 4 x S7's with 2 x IBM 2880's for each 30 amp PDU to remain well within the 75% allowed for each circuit. I may probably go with this new setup J4bberwock has come up with once all of my IBM's are in use [22 x total IBM 2880's]. I would have the option to power 5 x S7's comfortably on one 30 amp PDU with 2 of these new setups of J4bberwock's [One for each 15 amp leg on the 30 amp switched PDU's]. Man, I can't even imagine the noise 22 of those would make. Why are you only getting 220V from your service? Should be 240V. Mention that when the engineer comes by, he'll send a team of linesmen to increase voltage on the transformer in the pole. They bumped mine up after I complained about having only 227V with my heavy load. |
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If that PSU was having issues, it's a lemon. I think Phil was running on 120V back then too. 240V is easier on the PSUs, I hope you'll be using 240V with 6 S7s?
EVGA says you can pull 1300W DC from them, IE ~1450W at the wall for 10 years. That's good enough for me! Worse case they replace the PSU for free.
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Please PM me if you have 1 for sale. Thank you.
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I'd like to buy a coupon if someone has one. PM me.
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Cheese and Rice, the EVGA 1600 is over $300! That's insanely expensive, considering one of my IBM Units power two S7's, and including the awesome Jabberwock breakout board and 20 PCIe cables per PSU, I bought them for about $260 before shipping and C20 cable, each.
Jabber, tell me more about how this fan mod works, and how to go about doing it.
Also, you said that the 2000W HP unit is quieter. If I use one of those, I'd likely have to use 1 per S7, so how much would one of those set me back overall?
Thanks guys, I appreciate the help
Yep, used server PSUs beat ATX PSUs in every way. The 2000W is an IBM, not HP. DPS-2000BB made by Delta, to be precise. 1 PSU powers only 1 S7, but combining 2 PSUs into a 4000W unit lets you power 3 S7s. |
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