Looking forward to hearing if S7 responds to undervolting and clocking?
If it does function I am guessing at 10.8V & 425MHz we might see 3450GH & 650W ?
Rich
It would be so nice to be able to order an extra one 'just to play with' so you never had to take the 'others' down.
I bit the bullet and ordered one. I have been following the thread where you, Phil, etc have been discussing adjustable voltage PSUs. I would very much enjoy seeing a solid delivery on the aforementioned undervolt and the PSU you guys think can do it while maintaining a solid efficiency.
For anyone interested the thread is here:
https://bitcointalk.org/index.php?topic=1151460.0The points I have picked up are:
1. Plan to start the unit closer to 12v and then adjust the input voltage for maximum range.
2. Watch for a consistent increase in HW errors and you know to back off.
3. You seem to require a specific S5 board version. RICH goes in detail explaining his in the thread. I hope someone can show an S7 board to see if it has the same components.
I understand Rich's disclaimer: he isn't stating this board revision is exactly why some units overclocked and others didn't, but he is pretty damn sure.
D. The thread is a fire starting for the people who are interested in getting the most enjoyment from turning knobs, electricity, and adjustable power supplies. Good stuff
I do not forget the few months wondering if I would be able to purchase something modern but I am happy with everything so far with the S5+ quality except. 1 Fan failure and 1 heat sink which wasn't cut out properly. The front of it was still full of material. It is installed on the front where you had to be able to see it when installing a fan. Pretty glaring. Although, if that is the worst I have to deal with, no worries. I spent the day friday e-mailing with bitmain support. Started with Colorado and after e-mailing a few times they sent me to zendesk. After emailing zendesk a couple times they sent me to china. Unusual route for me this time, but this is what they told me to do.
The fan quit. As they have for several people on the S5, S5+ and even one of the reviewers posted about an S7 he just received with a non-functional fan.
I confirmed 100% it is indeed the fan which failed on the one I have. Not the controller or wire.
S5+ Runs great on dual 2880s.
#1 2880 running S5+ left and center module -- using 2290 watts
#2 2880 S5+ right module, S5+ control board, a stock S5 and a underclocked to 1100ghz / 630 - 650w SP20 -- using 2385 watts.
(These amounts are based on a small sample and could be off 20%, but I do not think so.)
Like some of the better PSUs you can run a high load on these 2880s and (do not do this unless you know what you are doing. I am not recommending anyone do anything I say) I don't think it is an issue to run the S5+ on a single 2880, but it isn't as efficient. Not saying anything most do not know. As a matter of fact it would probably be pretty bad because the way they really taper off in efficiency at the maximum or exceeding maximum load. Many miners will tell you it is easy to make your power bill jump fast or lower in that same time frame by properly loading your power supplies. It would be amazing to see a modular PSU system with load balancing in a kit form to provide 1x.x vDC to a bank of string design miners and then compensate based on history of which miners didn't run well at whichever voltage. I know with the S5 and assume with the S5+ it matters if you have a specific revision, but the trend you saw was the addition of those components so it is safe to assume the S7 did have them is that correct?
I think several miners who can afford to pickup 5 - 10 or more S7s would happily pickup a newer revision PSU "system" which allowed for a good underclock. It does appear that some are able to go much further than even some of the ones with the right boards, but I'm confident a recommended setting could be made by you guys.
I plan to change some things around with the power so I have a little more load on #1 and #2 2880 PSU. (I do not recommend anyone ever overpowers a PSU!!!) One time I ran one of Jabberwocks 2880 boards with every slot filled with S3s using 2 cables per S3. It ran for several days and the only casualty was a few of the S3s ran a little odd and lost hash overall. (Seriously, the people who know what they are talking about will tell you do not do this. Do not plug in too many things. Add 20% to your calculated usage I was with my units the entire time, but it was still not worth what could have happened!) It was around 3300 or 3500? watts, I do not remember exactly. in my bedroom. The white noise was a little much, but I do enjoy the noise in general. I am sleeping with an S4 at the moment. That sounds sick huh. The S5+ and S7 are not coming in unless I get very cold.
MY personal disclaimer because I feel like I should for some reason:
I understand investing in any new miner may be a bad choice, if that is what I do, invest. I willingly spent my currency on modern miners. (This is for the people who keep telling so many they are idiots for purchasing mining equipment. I get it, buy coin, I agree, it would be the safer thing to do. Point made. Give it a rest, the price is what it is as well. We are all going to hell for buying new miners. Understood)
Cant wait to see what you guys come up with for the S5 and S7 Rich. I bet Phil could sell a million power supplies if you roll across the right one with a delay (relay?) to handle adjusting the voltage.
I am gonna go play with some Gekko compaq sticks.
**EDIT** Yes, sorry, edit after my WOT, but I will be as short as possible. Help requested and very much appreciated:
Major, Rich, or anyone, please tell me what you are using to measure power usage on your split phase 120 / 240 vAC lines. I have a kill a wat for a single line which I could discombobulate some things to read one line, but Ive been told the 240v kill a wats are expensive. I have a good meter with a record function, true rms fluke 87. Not the best but a decent meter which is calibrated every few months. I also have a AC DC amp clamp where it connects to the meter and displays 1mv = 1 amp. Should I set it on AC amps and measure / record each line of the split phase for however long the meter can save and average out based on that? It may be the best I can do with the equipment I have, but I would sure like to be able to attain instant feedback in a painless and inexpensive way. I can afford something reasonable, but not the hundreds or even thousands I see charged for proper long term measuring equipment.
Any advice?
Thanks people!
