ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH

[smaxz]

if they're at full speed you would be fine with just venting exhaust and a manageable room temperature.

[1713977206]

1713977206

[1713977206]

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[Biodom]

If you want to get away with S3 fans, you need to undervolt the S7. Read sidehacks thread and buy that microchip programmer from eBay.

no need to even buy that programmer as sidehack has three S7 miners already adjusted/undervolted to 870w-1050w available in Marketplace.
By my calc you can mine with them until next summer (with about 2% average diff rise, currently 1.94%) EVEN at 8.9c power.

[JaredKaragen]

To add perspective my father sells power to pge in the Bay Area at 13c/kWh...  They charge like 28c.  Insanity.

[babycicak]

received a batch19 of s7, 2 unit is down, when open up,.. the board is very old and dusty,..it's second hand unit
does this happen to anyone of you? feeling down and down...

[suchmoon]

Batch 20 now available at $365

https://www.bitmaintech.com/productDetail.htm?pid=000201606140744014851E341twm065B

received a batch19 of s7, 2 unit is down, when open up,.. the board is very old and dusty,..it's second hand unit
does this happen to anyone of you? feeling down and down...

Yes, that's what happens with late batches. Bitmain is cleaning out their farms and the QA process is... inconsistent... to put it mildly. Some miners are ok-ish, but some haven't been cleaned or even tested as seems to be the case with you.

[aarons6]

anyway to get these things to balance between 2 pools?

on the s5 you just put --balance in the last password field and it tacked it on the command line.. but the s7 doesnt seem to be doing that since its using a config file and not a command line..

i tried to scp in and set "balance" : true, in the config but it just messes up and runs the miner at 100 speed when you apply it..



any ideas?

[elokk]

Is there any way to identify the batch number based off the serial number listed on the sticker on top of the controller? I sold one of my s7's on Amazon, took offline and shipped in an hour or so then the buyer emails me once he received it claiming it was "dead on arrival"

EDIT: any suggestions on how this perfectly working miner could now be "dead"

[DickyDck]

I am posting here as to not create another thread somewhere else. I have been mining with my S7 for roughly 8 months with no issues. It recently killed the input fan, and of course I had it set to shutdown when it hits 80 degrees to prevent damage. When I finally got around to getting a new fan today, I hooked it up. The miner starts up, and runs for about 2-5 minutes, temperatures never get above 65 degrees, but it will start beeping and then stop mining. All the chips are showing good, it has been off for about 5 days while I waited for a new fan to arrive. I purchased a much stronger fan, and it is powered externally through the PSU directly, not into the controller board. Does the unit need to see FAN RPMS from 2 fans? I have the other fan that didn't die still setup and plugged into the controller board. Any ideas? I will/can try the usual suspects like firmware upgrade and all that, just seems strange to me that it worked fine before, and after being shutdown for a few days and adding a new fan and now it won't stay mining. I have even underclocked it to 575, where as I usually ran it underclocked at 600 anyway.

[aarons6]

Does the unit need to see FAN RPMS from 2 fans?

yes..

there is a one fan rom.. but im not 100% sure you can flash it on regular s7s or not.

im sure someone has tried so they can chime in saying if it worked or not.

[aarons6]

Is there any way to identify the batch number based off the serial number listed on the sticker on top of the controller? I sold one of my s7's on Aamazon, took offline and shipped in an hour or so then the guy emails me once he received it claiming it was "dead on arrival"

did you ship the power supply with it or did he supply his own?

if he used his own he might have tried some cheap crappy ones and blew it up.

or if you gave him a bitmain power supply he might not have 220.

[elokk]

I did not provide a power supply.

I requested pictures and he sent back pictures of an s7 with the bitmain 1600w psu connected, maybe a video showing the the psu running while wired to the s7 would be better to have . I have a feeling he decided he did not want it, trying to return a different fried s7, or possibly bought another one cheaper because the price did drop after he purchased from me. Amazon buyers are always scamming sellers of mining equipment

[DickyDck]

Does the unit need to see FAN RPMS from 2 fans?

yes..

there is a one fan rom.. but im not 100% sure you can flash it on regular s7s or not.

im sure someone has tried so they can chime in saying if it worked or not.

Thanks for the super quick reply! Sooo, if I plug in a bunch of old S3 fans perse, and it recognizes RPMs, you think that would successfully trick it?

[HerbPean]

My S7 F1 were in a hosting facility and never got my hands on them. Apparently my version of the daughter board have ONLY ONE fan connector. This sucks big time, i bought a few fans and plate to upgrade them with two fans.

@Bitmain any solution about this disaster ?

Thanks

EDIT: I couldn't find any picture of that daughter board with only one connector. I saw picture with two connectors.

[Sierra8561]

Does the unit need to see FAN RPMS from 2 fans?

yes..

there is a one fan rom.. but im not 100% sure you can flash it on regular s7s or not.

im sure someone has tried so they can chime in saying if it worked or not.

Thanks for the super quick reply! Sooo, if I plug in a bunch of old S3 fans perse, and it recognizes RPMs, you think that would successfully trick it?

I've done it and it works fine. But still attempt at your own risk!

[dmwardjr]

My S7 F1 were in a hosting facility and never got my hands on them. Apparently my version of the daughter board have ONLY ONE fan connector. This sucks big time, i bought a few fans and plate to upgrade them with two fans.

@Bitmain any solution about this disaster ?

Thanks

EDIT: I couldn't find any picture of that daughter board with only one connector. I saw picture with two connectors.

Good luck with that.  I've been rather disappointed lately with the so called support of Bitmain.  That's why I gave up and never bothered purchasing the S9.  I'm hearing horror stories about the lack of support with the S9 as well.

Anyone who purchases an S7 now should not do so in my opinion unless you have FREE power.  It's quite obvious Bitmain is selling all of the S7's in their farms and replacing them with S9's.  It's only a matter of time before the S7 is obsolete.

I used to be a BIG fan of Bitmain.  I refuse to support them any longer with their endeavors to take advantage of people.

EDIT:  Look at the network hash rate on bitcoin wisdom.  You see a lot of S7's going off line at Bitmain farms and the difficulty going down.  S9's are being added to their farms now.  Hence, the difficulty rising again.

[aarons6]

anyone have a tutorial on how to modify the firmware?

its initramfs..

so im guessing i can just gzip it with cpio?

edit the files and gzip it back up and flash it?


i want to add a scrip to init.d

edit that didnt work.. says its not a gzip format..

[Rabinovitch]

This weekend I set up a few S7s and found 3 of them with the same symptoms. Each of them starting to mine but the red led is flashing on their controllers. And after about 1.5 minutes the hashrate is falling gradually to zero.
In web-interface I see that S7s are rotating only one fan of two connected and it seems that they are able to detect the rotation of the second fan (it rotates due to airflow of the "working" fan). I tried to change the fans, to connect the fans to different connectors on S7's I/O board without any effect. On one of these S7s I flashed latest available suitable firmware - also wothout any effect.

Has anyone encountered this problem? Is there any way to fix it?

[dmwardjr]

This weekend I set up a few S7s and found 3 of them with the same symptoms. Each of them starting to mine but the red led is flashing on their controllers. And after about 1.5 minutes the hashrate is falling gradually to zero.
In web-interface I see that S7s are rotating only one fan of two connected and it seems that they are able to detect the rotation of the second fan (it rotates due to airflow of the "working" fan). I tried to change the fans, to connect the fans to different connectorson S7's I/O board without any effect. On one of these S7s I flashed latest available suitable firmware - also wothout any effect.

Has anyone encountered this problem? Is there any way to fix it?

I had 6 x S7's out of 34 do this.  That's one reason of several WHY I stopped buying shit from Bitmain.  30 days warranty just isn't cutting it.  If they can take advantage, they do so.

EDIT:  So, I sold all my shit back in February last year and began GPU mining.

[jstew]

This weekend I set up a few S7s and found 3 of them with the same symptoms. Each of them starting to mine but the red led is flashing on their controllers. And after about 1.5 minutes the hashrate is falling gradually to zero.
In web-interface I see that S7s are rotating only one fan of two connected and it seems that they are able to detect the rotation of the second fan (it rotates due to airflow of the "working" fan). I tried to change the fans, to connect the fans to different connectors on S7's I/O board without any effect. On one of these S7s I flashed latest available suitable firmware - also wothout any effect.

Has anyone encountered this problem? Is there any way to fix it?

i have one s7 that does this sort of , it hashes just fine , pool side hash shows correctly , but the red led flashes every few seconds. ive even tried reflashing the firmware and it still does it


anyways im working on a project to stick 9 s7 blades in a 4u s2 case with a dps4k psu setup, were can i get longer cables to connect the hash boards to the controler

[fullzero]

anyways im working on a project to stick 9 s7 blades in a 4u s2 case with a dps4k psu setup, were can i get longer cables to connect the hash boards to the controler

A member was selling them last year; can't remember who.  I think Phil bought some; he will probably remember if you ask him.