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

[AriesIV10]

Well lost my 3rd hashboard yesterday.  This was a batch 8 that had been hashing for 12 days.
Unfortunately Powercycle PSU does little.  Hashboard will come on for a few seconds and spew out copious HW errors.
Then it resets itself and hashboard shows as dead.  Opened another ticket with support, but not sure how well thats going to go with zero response still on the 2 batch 5 hashboards in RMA.

I noticed these run much warmer than the previouis batches.  Obviously due to the 700mhz.  I had underclocked a few units that were running hotter than others.  This unit was left at default 700mhz.  I've since set all units to 650 frequency to cool them down a bit (lower to mid 60c's)  In contrast to prior batches these are inferior.  I doubt they will have close to the lifespan the others will given the 700 frequencies.

This does not give me much hope in the Batch 8 Order that will be delivered Monday!   I have been hearing quite a few problems with the Batch 8! 

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[dmwardjr]

I noticed these run much warmer than the previouis batches.  Obviously due to the 700mhz.  I had underclocked a few units that were running hotter than others.  This unit was left at default 700mhz.  I've since set all units to 650 frequency to cool them down a bit (lower to mid 60c's)  In contrast to prior batches these are inferior.  I doubt they will have close to the lifespan the others will given the 700 frequencies.

Well, the others were factory clocked at 550, 600 and 625.  I say the batch 8 was already over clocked at the factory to 700 and should be at 600 like the batch 6 @ 4.05 TH/s with 135 chips.  I have since under clocked the 3 of mine that run hotter than the others to 650.  I'm thinking about lowering them to 600 [Especially, when summer time arrives] for the longevity for the rigs.

[VirosaGITS]

I noticed these run much warmer than the previouis batches.  Obviously due to the 700mhz.  I had underclocked a few units that were running hotter than others.  This unit was left at default 700mhz.  I've since set all units to 650 frequency to cool them down a bit (lower to mid 60c's)  In contrast to prior batches these are inferior.  I doubt they will have close to the lifespan the others will given the 700 frequencies.

Well, the others were factory clocked at 550, 600 and 625.  I say the batch 8 was already over clocked at the factory to 700 and should be at 600 like the batch 6 @ 4.05 TH/s with 135 chips.  I have since under clocked the 3 of mine that run hotter than the others to 650.  I'm thinking about lowering them to 600 [Especially, when summer time arrives] for the longevity for the rigs.

Hmm, but overclocking or downclocking the rig should change nothing on its longevity. It should be merely at what heat they are being run at. Its possible than when the rig show for say 70c, some component is being stressed at 150c+. So lowering the heat one way or another is required to avoid failure.

I really don't know what cause so much hardware failure but afaik if you keep them cool, the clock changes nothing.

[lightfoot]

Hmm, but overclocking or downclocking the rig should change nothing on its longevity. It shod be merely at what heat they are being run at. Its possible than when the rig show for say 70c, some component is being stressed at 150c+. So lowering the heat one way or another is required to avoid failure.

I really don't know what cause so much hardware failure but afaik if you keep them cool, the clock changes nothing.

So go out and buy a small $40 IR temp sensor with a laser thingie. I've been having a ball with KNC Neptune/Titan boards, the hashing chips get so hot when people overclock they melt the solder underneath enough so when they are bumped you get shorts. Chip temp <> board temp...

No wonder there are scorch marks under the chips.

Is anyone doing this yet?

[dmwardjr]

I noticed these run much warmer than the previouis batches.  Obviously due to the 700mhz.  I had underclocked a few units that were running hotter than others.  This unit was left at default 700mhz.  I've since set all units to 650 frequency to cool them down a bit (lower to mid 60c's)  In contrast to prior batches these are inferior.  I doubt they will have close to the lifespan the others will given the 700 frequencies.

Well, the others were factory clocked at 550, 600 and 625.  I say the batch 8 was already over clocked at the factory to 700 and should be at 600 like the batch 6 @ 4.05 TH/s with 135 chips.  I have since under clocked the 3 of mine that run hotter than the others to 650.  I'm thinking about lowering them to 600 [Especially, when summer time arrives] for the longevity for the rigs.

Hmm, but overclocking or downclocking the rig should change nothing on its longevity. It should be merely at what heat they are being run at. Its possible than when the rig show for say 70c, some component is being stressed at 150c+. So lowering the heat one way or another is required to avoid failure.

I really don't know what cause so much hardware failure but afaik if you keep them cool, the clock changes nothing.

That's the main thing I'm referring to... during the warmer wether.  I had to under clock 4 x S7's batch 8 last week with it 72 to 75 degrees outside because they were getting close to 80 Celcius.  It's not issue when it's in the low 50's or below outside.

Part of this had to do with their placement and the lack of grilles in the other door for air flow.  I'm putting 4 new grilles in the door next to the door that already has grilles this weekend.

In the photo below you will see the door on the right has grilles and the door on the left does not.  The rigs on all shelves that are closer to the door without grilles are warmer because heat manages to ricochet off the door without grilles and is sucked into the rigs closest to it.  Once grilles are installed in the other door, the exhaust fan will suck cool air in through those doors and reduce ricocheting into the rigs next to that door.

This mining closet is about to be totally reorganized during the power upgrade I'm getting sometime within the next 3 to 4 weeks.  The IBM 2880 PSU's will be laying flat with a wire shelf resting on top of them.  THEN, I will have the S7's sitting on top of the wire shelf that is on top of the 2880 PSU's.  This way, I can easily have 6 x S7's in front of each grill with a total of 12 x S7's on each of 5 shelves.  So, I will have some work to do when I install 14 more 30 amp outlets and reorganizing the shelves on the rack.  As well as installing 4 x new grilles in the other door.  There are 14 more S7's sitting in another closet waiting for power upgrade.

There are 5 shelves with 4 x S7's on each shelf at the moment.  You cannot see the bottom shelf in this photo.  You can see one S7 without PCI-e cords on a shelf sitting up against another working S7 to prevent warm air from ricocheting off the door into the working S7.  The temperature reduced by 4 degrees Celsius when I placed that rig next to it.

https://i.imgur.com/dW6vj9Y.jpg

Example of the wire shelf that will sit on top of 6 x IBM 2880's then 12 x S7's will sit on top of the wire shelf that is resting on top of the 2880 PSU's:  [By the way, I'm remodeling my home.  So, ignore the speckling on the wall and lack of silicon on the base molding with new paint.  That is new flooring I've installed.

https://i.imgur.com/99pdY0a.jpg

You see the 2880 and 2980 PSU's will have no problem with air flow.  The wire shelving resting on top of them will not impede air flow.

https://i.imgur.com/vtG5IV6.jpg

[Sweminer777]

Does the Controll board play into the clocking?

i get alot of erros at 600mhs on b6

if i clock to 606 the hash rate just drop to half, anything above that give alot of errors.

underclocvking dont seem to make much difference

[cryptichermit]

I noticed these run much warmer than the previouis batches.  Obviously due to the 700mhz.  I had underclocked a few units that were running hotter than others.  This unit was left at default 700mhz.  I've since set all units to 650 frequency to cool them down a bit (lower to mid 60c's)  In contrast to prior batches these are inferior.  I doubt they will have close to the lifespan the others will given the 700 frequencies.

Well, the others were factory clocked at 550, 600 and 625.  I say the batch 8 was already over clocked at the factory to 700 and should be at 600 like the batch 6 @ 4.05 TH/s with 135 chips.  I have since under clocked the 3 of mine that run hotter than the others to 650.  I'm thinking about lowering them to 600 [Especially, when summer time arrives] for the longevity for the rigs.

Agreed, its as if they are aggressively overclocked at factory - which is why I think there will be greater failure.  Higher temps, higher voltages = more burnouts.  Summer may be rough for S7's without underclocking.
Out of my 10 batch 8 Units, I initially underclocked 4 to 650.  The hashboard that failed was only running around 65 - maybe 67 at peak, so I had not underclocked it.  I've downclocked them all now to minimize failure.

[dmwardjr]

Agreed, its as if they are aggressively overclocked at factory - which is why I think there will be greater failure.  Higher temps, higher voltages = more burnouts.  Summer may be rough for S7's without underclocking.
Out of my 10 batch 8 Units, I initially underclocked 4 to 650.  The hashboard that failed was only running around 65 - maybe 67 at peak, so I had not underclocked it.  I've downclocked them all now to minimize failure.

Sounds like a plan.  The low temperature tonight is 32 degrees fahrenheit.  It's in the 30's now.  I have all of mine back to 700 MHz except for one.  It's at 675 with temps at 62, 59 & 61 on all 3 blades.  The other 3 rigs that has higher temps than others are in mid to upper 50's.  I'm wondering if the one's I have with higher temps are as another member mentioned about different fans installed.  I'm thinking about checking out the fans tomorrow to see if there is a difference.  If there is, I'm replacing the less effective fans with the 5,700 RPM Delta fans I have laying around.  They are extras I have on hand to replace fans in S4's if they were to fail.  I sold all of my S3's, S4's, S5's and SP20's.  Well, I still have one S5 remaining.

[VirosaGITS]

That's the main thing I'm referring to... during the warmer wether.  I had to under clock 4 x S7's batch 8 last week with it 72 to 75 degrees outside because they were getting close to 80 Celcius.  It's not issue when it's in the low 50's or below outside.

Ah i see. Maybe the heat there accumulate? I'm just comparing to my S5's, when the fan was full speed and it was 30C+ outside, which is... 86F+, they were running fine if i was dumping the air strait outside so that the ambiant does not accumulate.

However i needed the fan running full blast to keep the temps in the low 60s.

Having the S7 get close to 80c at lower temp is a bit scary to be honest. I hope mine wont run that hot.

[marvykkio]

does anyone know what it's called the connector that is being put to the psu?
because I do not trust the traditional cord of the classic psu supplied
I think they are small 0.75mm

[VirosaGITS]

does anyone know what it's called the connector that is being put to the psu?
because I do not trust the traditional cord of the classic psu supplied
I think they are small 0.75mm

You mean the power cord for the PSU or the PCI-e cable you use to connect into the miners? You'll want 16 AWG for the PCI-e and probably a short 12AWG for the PSU.

[marvykkio]

I need you to feed the cable psu of bitmain

[marvykkio]

which cable you use to power psu psu
I'm interested in a section of cable at least 1.5 mm
or 2.5 mm
psu to power of bitmain
I have are 0.75mm
and it seems too small section

[edonkey]

Did anyone receive the "late shipping compensation" yet?

No. Nothing has happened since they emailed on December 28th asking for a receive address for the compensation.

[philipma1957]

which cable you use to power psu psu
I'm interested in a section of cable at least 1.5 mm
or 2.5 mm
psu to power of bitmain
I have are 0.75mm
and it seems too small section

the power cable from the wall socket to the psu needs to be 17awg if you use  240 volts


1 moment I will find the number in mm


http://www.rapidtables.com/calc/wire/awg-to-mm.htm

1.2908 mm = 16 awg = very good for 1 bitmain psu

1.1495 mm = 17 awg =  good for 1 bitmain psu

1.0237 mm = 18 awg = maybe for 1 bitmain psu

0.9116 mm = 19 awg =  bad for 1 bitmain psu  


 so do not use a .75mm cable  find a 1.15



The sneaky referral link from another  forum member  was pulled and about 5 posts are gone.


 my info above is accurate so please do not  use anything smaller then the 1.1495 mm = 17 awg .

[dmwardjr]

Hi everyone,

I just thought I would let you know that HomeDepot is having a great deal on the best metal rack in the business.  It has 3 support braces per shelf.  The deal is good up until January 31, 2016 or until supplies last.  Amazon has it for $311.00.  Sam's Club has it for $249.00.  HomeDepot is selling it for $169.99 plus tax.  If you have it shipped to a local store and pick it up there yourself, you will have no cost for shipping.  It will cost you to have it shipped to your house.  Here's the link:  http://www.homedepot.com/p/Gladiator-4-Shelf-73-in-H-x-77-in-W-x-24-in-D-Welded-Steel-Garage-Shelving-Unit-GARS774SZG/204280487

[dmwardjr]

This pisses me off...

I got a bill in today from UPS for $889.63 for the 23 x S7's batch 8 I received on December 22, 2015.  It would have been nice to know this before my purchase.  I'm not using UPS to ship from China anymore.  No consistency at all.  I've had a $17,000+ purchase, $9,000+ purchase and $7,500+ purchase from China using UPS before and never had anything but brokerage charge ranging from $39 to $69.  This time it's $890.00.  This sucks!  I can still pay it no problem.  It's just not appreciated when it comes as a complete surprise.

[Crypto84]

This pisses me off...

I got a bill in today from UPS for $889.63 for the 23 x S7's batch 8 I received on December 22, 2015.  It would have been nice to know this before my purchase.  I'm not using UPS to ship from China anymore.  No consistency at all.  I've had a $17,000+ purchase, $9,000+ purchase and $7,500+ purchase from China using UPS before and never had anything but brokerage charge ranging from $39 to $69.  This time it's $890.00.  This sucks!  I can still pay it no problem.  It's just not appreciated when it comes as a complete surprise.

im confused. why did you get this bill? when i ordered my S5's i dindt get a bill like this....are you in the USA?

[dmwardjr]

im confused. why did you get this bill? when i ordered my S5's i dindt get a bill like this....are you in the USA?

Yes, I'm in the USA.  I live in Alabama.

EDIT:  I added another screenshot above with another page of details.

[fr4nkthetank]

I say pay it, but then dispute it at the customs agency if you think you shouldnt be paying it.  i mean, could be worse, i have a 330$cad bill for just ONE (canada).  disputing it, but we shall see what that does...