Topic: ANTMINER S7 is available at bitmaintech.com with 4.86TH/s, 0.25J/GH - page 177. (Read 527809 times)

Yea, F that.  If he was a guest user I would simply cancel the sale and re-list.  Bunch of BS that Ebay lets you get scammed...plus they charge you the fees for being scammed as well.

The buyer was a "Guest User" for one time purchase.  Wolfen, told me some of the details before.  It's crazy isn't it?  PayPal should be the one responsible.  They should make sure potential buyers are fully vetted before allowing them to make a purchase over $99 USD from a seller.  The entire episode is a crock of shiznit!

I've learned [now] I will NOT complete a sell to anyone with less than 10 feedbacks if what I'm selling is over $100.  PERIOD...

I don't care if I get negative feedback!  I'm not selling to anyone with less than 10 positive feedbacks as a buyer.

That's scary to hear.  Did the buyer have any positive feedback?  I honestly have not had a problem selling a bunch of S3's and my S5's on ebay, but the buyers all had good positive feedback.

I would agree with using your hand to investigate.  What I did was use two fingers extended out over the edge over the back fan and the front fan.  I would move my two fingers (index and middle finger) around the edge in a circular motion until my fingers were at a point where the noise was no longer audible.  Once I found the location where the air being sucked in was no longer audible, I placed only one finger (my index finger) over the same spot and the sound was still no longer audible until I moved my index finger to another location.  So, I was able to find the "sweet spot" to place the tape on the grille of the intake fan in front.

Every rig does not have the radiator type heat sinks in the exact same location on every chip.  Some could be off or aligned in a certain way after manufacturing that allows for a whistling sound as wind is sucked in between the fins of the heat sinks when they are positioned just right.  Since every rig does not have heat sinks in the exact same location and the exact same size [varying by thousandths of an inch]... this whistling noise is audible only on a small percentage of rigs that have these heat sinks aligned just right to allow for this audible noise.

This is why I feel a small piece of tape is sufficient to reduce the amount of air across particular heat sink(s) causing the noise.  I noticed one miner had placed a piece of foam on the shelf in front of the fan to reduce the noise because that just happened to be the location on his particular S7 where heatsink fins were aligned just right to allow for the whistling noise.  The location of where the wind rushes in across heatsinks will vary from one rig to another more than likely.

UPS just dropped off my S7 and it's hooked up to an EVGA 1600w Platinum ATX PSU hashing until my items from Finksy arrive and I hook it up to a Bladecenter 2880w PSU.

Only complaint so far is the machine is making a sort of high pitched whistling sound that comes and goes, sounds like a heart rate monitor when someone dies and it gives off that constant tone/flat line. Figured I'd let it run for a while to see if it dissipates on its own before trying to troubleshoot it. Anyone else have this issue?

Damn...

Really?

So, PayPal did not help or eat the cost?

Unbelievable...

Looks like selling miners on ebay is a disaster.
Have a buyer that issued a chargeback claim to their credit card for a purchase 60 days ago.
Ebay doesn't know about it.
Paypal knows about it but the buyer only filed a complaint with their credit card so paypal will only accept
whatever the credit card decides to do. They have the credit card info but will not share it with me.
Told me I will probably have to file a police report for theft. Unbelievable.

Buyer has 4 miners AND the cash. Looks like I will be the one to eat it.

I don't know how anyone can do business like this. Blatant fraud goes completely unchecked.

Yeah I def hope that bad boy is wrong. Waiting on UPS to deliver my Batch 7 and was playing around with numbers to figure out potential payouts to ROI before July combined with my S5s, but seeing that difficulty (if true) just crushed those dreams even with running it on my one circuit with free power. Hopefully the diff drop leading up to the halving drops considerably with everyone taking miners offline to sell and I can make some ground up by mining through the halving.

It's 1293 watts at the wall for the boards, fans and controller at 25 degrees Celsius ambient temperature.  Batch 8 is approximately 400 watts per board at default frequency of 700 MHz.  The HX850 can actually push more than 850 but not recommended.  I would think you would be fine without over clocking.  However, you might want to ask dogie or someone else who is very familiar with this PSU.  Shoot dogie a PM.  You will find a forum he created about PSU's here: Dogie's Comprehensive Power Supply Analysis:  

And I still don't know if I can safely run a batch 8 on 2 HX850's.  I'm running my batch 3 on two and it's working fine, but the 1293W is concerning since I need to power two boards with one PSU...not sure if that pushes over 850W for two boards since they don't mention how many watts each board will pull.

Sounds like it's time for you to go to the following thread to place a bet:

Diff thread Nov 23 to Dec 7 Set up stage- Picks Open!

Yikes...

Just used the Alloscomp mining calculator and it estimates the difficulty will jump 33% in 4-5 days (from 70+ billion to 92+ billion)

That's just insane lol

Understood.  Thanks for the link.  I see what you are referring to now regarding fan malfunction instead of internet malfunction.

EDIT:

This post made by BITMAIN is what had most all of us believing the October Firmware update was possibly a fix for internet connection blackout.  He does advise us getting a second ISP for a good reason apparently:  So, I suppose I should have paid more attention to the "exclamation point" at the end of his statement regarding making sure "you do not lose internet connection!"


EDIT #2:

I can see now why an update to the October firmware may be beneficial since it may address the issue of a fan malfunction instead of an internet malfunction.  Now, my only concern is updating firmware for batches of S7's with frequencies higher than 600 MHz.  The present firmware updates available only go as high as 600 MHz.

I understand your answer but my message was not about someone's burned miner. Any statements from Bitmain that October firmware SOLVES internet blackout issue?  I've just never seen this and that's why the question was.  Btw at least it solves possible fan malfunction like posted here https://bitcointalksearch.org/topic/antminer-s7-not-working-anymore-after-firmware-upgrade-1235167

Actually really bad that Bitmain firmwares do not have any public release notes..

Here is only one example [from page 199] of several listed in the forum [I'm not going to take the time to look up the others on other pages in the forum.]:


I KNOW Biodom is NOT making this up.  His internet blackout was only a short time.  How long is short?  I don't know...

If anyone wants to test this out for us by disconnecting internet from their S7 [with October firmware] and leave it disconnected for two hours or more, be my guest.  I'm not testing it on mine.  I don't want potential delays from having to send boards back for repair/replacement.  

I personally will not upgrade anymore S7's I purchase in the future unless it is necessary for some major fix.  Even if my S7's arrive with an updated firmware other than September, I'm setting my fans to manual.  Period...  It's not worth the risk.  If they take away the ability to manually set the fan speed, I will connect the fans directly to a PSU.  It's just not worth the risk.

Go with teamviewer it woks very nicely.  If you have a iphone or android smart phone it does have apps, where you can log into computer from phone.  This is a very nice thing when on the go.

As far as minerlink I don't think it ever turned into anything.  I think they have a IP scanner up on that site.. but nothing useful as far as controlling machines.

I wonder who told you this fact that it solves internet loss issue?  At least October firmware protects of fan's malfunction and stops hashing to prevent overheat. Try to disconnect one fan during running and you will see result - it will stop hashing. Anyway this is your own risk and I can't guarantee anything to you as I am not manufacturer.

Hello,

i want to buy a Antminer S7 batch 8 and searching  a Antminer S7 Batch 8 Coupon.
I will pay for an 100$ Coupon 0.1 BTC and for an 150$ Coupon 0.15 BTC
If you have one, please contact me per PM to exchange the BTC Address and Bitmain Account Data

See you
Willi

Switched PDU(s) and Teamviewer with an extra computer on premise is an easy way.

Kind of off topic but has Bitmains minerlink ever worked?  Is it kind of an abandoned project or what?





i tried setting it up but it doesn't seem to work. Is there any other way to manage multiple antminers efficiently ?