Topic: Collecting Data on B8 S7 Failure Rates - page 2. (Read 4377 times)

Almost through the first 2 weeks. The miner mine 4.72 TH/s when supercooled (Fans@3k, Temp at 50c). The HWE% is still at 0. 130 errors in 5 days. So far so good, i hope the unit last a long time.

With the 0 HWE% i guess i would be able to get a good OC potential out of it. But on 120v15A breakers, i'd be pushing the circuit over 80% load, so, maybe in the future if i get access to 240v or 20a breakers.

November 2015 2 x antminer S7 batch 5 from antminerdistribution.com, these guys are based in the Netherlands, Europe.

Long story short: 1 Miner gave in almost immediately after power up.. hashing for one hour before it went dead....
Miner 2 took about 10 days to stop hashing on blade 1 en reduce hashing on blade 2...

after a couple of  emails between me and antminerdistribution.com..
1  miner sent back to them within a week...

2 blades and a controller (controller just to be sure) returned to AD within about 2 weeks.

To keep things positive: 
this company is doing everything in their power to find a solution, great communication, they call me instead of having me to call them.


Not happy, however the guys from this seller absolutely ROCK! keep up the good work ;-)
Really hope the manufacturer takes as much care of their customers as these guys...

Yes, 2 boards and a fan replaced.

S7 received, preliminary 20 mins run gives 4.74TH/s fan 50%, watt 1440 on two 1050 EVGA GS/G2. I estimated 1475w based on Bitmain's numbers. So a EVGA g2 1300 would run this fine albeit at 1450Watts~

Does anyone here have successfully get board replacment from bitmain?
I have sent both email and ticket got no reply at all.. its almost a week already.

which file did you have to modify to get it to work <20%?

3 pcie, 3rd can't see cuz it's molten pcie LoL

Scarry, I see 2 burned PCIe cables, was he powering each blade with 2 PCIe only?

I've done almost the same, 1300 EVGA powers 2 blades, and NOX URANO 850 TX powers 1 board+ controller.
Running at max 61c, but I'm not doing any overclock ( for now)

not b8 not mine, one of my friends s7 :

Ive had mine almost two weeks, been feeding it outside air (below freezing) and its been at these settings for over 48hrs now:

18% fans (had to modify a file to use settings <20%)
725Mhz = 4.85TH, 0.012% errors, temps 62-68C

it was originally powered by a gold 1350w PSU, but for better effiviency its now split  between the 1350W gold(2 blades + controller) and a 650W gold(1 blade) since i was otherwise running at 90-95% capacity on the single PSU

I had a chain #2 board fail after ~16hrs of use in a S7-B8 (was reporting 21 ASICs)
The unit was running default clock speed with a IBM 2880W PS. The temps were all
under 40°C prior to the failure.
The board has been shipped back for warranty (at my cost) and the responses from Bitmain
are that there won't be any compensation for the down time (failed Dec. 18) or my shipping costs. 

Odds are they should be fine. I have 3 of the earlier ones from Batch-8 and they are running perfectly. Never OC'd, fans turned down to 50-55%, all running the Bitmain PSU's. I've also placed an order for 2 more from batch-8 that I should get in a week or so.

I forget offhand what batch it was from, but I had an S7 come in for hosting and one board approximately caught fire as soon as I turned on the power. One fan has also failed and been replaced. The owner had previously sold it on eBay and it was returned as nonfunctional a few weeks later; he RMA'd two boards before it got to me. I suspect the eBay customer bought many from different places and put all the failed parts into one case to return so he wouldn't have to deal with separate RMAs (in which case he screwed over one seller pretty badly). Currently that is speculation. What is not speculation is that "one" S7 ended up with three failed boards (at least one of which failed with a light show) and one failed fan (which died after about two weeks on my shelf).

I don't have an S7 so please ignore if u choose just wanted to see if someone else has tried this as i'm thinking of buying some from the jan batch.

If 1 board has died & u own 2 of them can u link them on to another controller & see if they work??

Maybe the controller has issues not the board?

I haven't seen anyone in the forums mentioning trying this method??

Let me know if this helps? It may speed up the RMA issues if its just a controller..

I seem to remember someone talking about bung controllers before too..

Like the ones with the S5 that came with the first few S7's.

I'm not familiar with the brand.  Others here may be.  It's a damn good price for sure for 3.4 Amp 5000 RPM fan.  I paid $24.00 w/free shipping for each of 10 units on Amazon from one seller in mid summer for 5,000 RPM; 250 CFM @ 3.4 Amps specs.  Now you will pay about the same but will also pay for shipping for about $30.00 each fan on Amazon.  I like the price of the one you found.  I'm just not sure of the durability.  Only time will tell.

I will order a spare fan as my ant hill will continue growing so I will more than likely being needing spares anyway.  Is Ebay the best choice?  What is a fair price after shipping?

Anyone have these?  Are they any good?

http://www.ebay.com/itm/Replacement-Antminer-120mm-Fan-5000rpm-20in-cables-4pins-connector-BEST-/131665902676?hash=item1ea7e63c54:g:EiwAAOSwnH1WXl-D

I have 4 x B8s in my small farm, they are running but running hot +10c compared to other batches 600mhz.

1. all 7 x S7s are patched with Dec11 FW on 1st Jan 2016.
2. the irritating whoooooo sound has gone away in the last 2 x B8 ordered in mid-Dec (but they are running high temp 68-72c at fans 100%)
3. the whoooo sound in the other earlier 2 x B8 was rectified at 54% fan ratio with acceptable temp ~ 60-65c
4. the rest of the S7s are 600mhz variants, running 55% fan speed (to eliminate the whoooo sound) with 55-65c temps
5. All my S7s are VERTICALLY mounted - stock fans blowing upwards - with 2 box fans running at medium from below the rack.
6. HWE% are very small and I am satisfied with the hashing rate and quite stable to my liking.
7. All fans are stock with no mods.
8. My electrical setup was recently upgraded and all S7s are with dedicated points at 10amp/240v per point. I now have my own separate 120A/240v power distribution board for the miners.
9. The PSU power cord are all standardized with 1.5mm 13AMP/250v BS1363.
10. Each of the S7 are powered by the stock 1600w PSU from BMT with no mods.
11. All the above hashing power (33TH+) goes to kano.is since early Dec.
12. 5 x S7s were bought directly from BMT and shipped by DHL. No shipping issues.

That's my setup and journey so far, thanks to the many tips and guidance from this forum.

Although I don't have any bad units from BMT (fingers crossed), I feel for the rest because the miners are quite an investment. Hang on in there and keep sharing so that we could collectively help each other....

... TTYL.... kano just hit another one!

I had a couple of boards on chain 1 and 2 fail on me from B1. I replaced them but the one on chain #1 failed again, it is in China to be delivered tomorrow. Seems like chain #1 is the source of failure for many.

nhando,

I think it will be cheaper if you replace the fan by yourself, they might want you to send the fan at your cost for RMA.

the ones + all the s7 i have are on stock clock. just 7-8 hrs of hashing & gone. sob sob

btw, both failures on b8 is on chain #1 including b5 also chain #1.

1 of the b8 comes with the whooong whooong whoong sound.

placed a small double sided tape on the grill reduced the sound. could've stick another one but it will block the airflow & i'm fine with the reduced whooooong whooooooooooooooooooooooooooooooooooong whooooooooooooooooooooooooooong