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

[yslyung]

that many chips with 1 fan??? they're mad.
even with 2 fans - the amount of heat pushed out is quite substantial.
obvious that they are cutting corners now

S7-20160316-700M-1 fan-6000.tar.gz thats the latest FW ...

6000 means 6k rpm fan hmm afaik max prolly 5k rpm for fan of that size.

normal s7's (earlier batches) will not run if it only detects 1 fan, but have seen EXCEEDING 880deg C & causing miners to auto shutdown.

me thinks mid 70 deg C is still "ok" but exceeding 80C is a little too high.

afaik, chips are rated up to 125 deg C. thats only the chips but other components ? hmmm

most electronic components can take up to 880 C but if more, i smell trouble.

thoughts ?

[fullzero]

Received a 115$, also Antpool user only. The mail clearly sstates it can be used to buy a new S7 from bitmain. Ping me if you want the Coupon.

Buy a new S7 "for hashnest"

[notlist3d]

that many chips with 1 fan??? they're mad.
even with 2 fans - the amount of heat pushed out is quite substantial.
obvious that they are cutting corners now

S7-20160316-700M-1 fan-6000.tar.gz thats the latest FW ...

6000 means 6k rpm fan hmm afaik max prolly 5k rpm for fan of that size.

normal s7's (earlier batches) will not run if it only detects 1 fan, but have seen EXCEEDING 880deg C & causing miners to auto shutdown.

me thinks mid 70 deg C is still "ok" but exceeding 80C is a little too high.

afaik, chips are rated up to 125 deg C. thats only the chips but other components ? hmmm

most electronic components can take up to 880 C but if more, i smell trouble.

thoughts ?

I think leads to problems as you have only one fan working.... no backup.  So if there is a failure it's going to get hot.... and you are counting on it detecting it and turning off. The thought of a S7 with no fans running scares me personally.

I would only run 1 if temporary and had another fan on the way, also I would be watching heat like a hawk.   I think 1 fan sounds like a bad idea.

[citronick]

the S7 fan design is a "suck air" + "blow air" method, no?

which fan are they removing?

sucking or blowing one?

no punt intended 

[yslyung]

the S7 fan design is a "suck air" + "blow air" method, no?

which fan are they removing?

sucking or blowing one?

no punt intended  

they want to BLOW & don't want to SUCK ! heh

depends how u look at it though, blow to chips but it can be sucking cold air in too but blow the hot air out

[not.you]

The picture just shows the suck.

[AriesIV10]

The picture just shows the suck.

Haha - The picture and the website say it is the same fan (Cooling: 1x 12038 fan-same as Batch 15) which should ~ 182CFM @ 4800RPM, but the firmware says 6000 which would be considerably more and hopefully less wattage.

[fullzero]

Call it push and pull please.  The new batch only has a push.

[Cyper_BLC]

Finally i removed heatsinks from my B2 4.66 575Mhz S7 nonworking hashboard,
i will clean up soon but i seen very very strange thing on this board.
2 chip pins(14-15) (28-29) are soldered to PLL GND.
this pins are NRST_A and RST_N RF and Test pin.  

-this chips always reset on TEST mode , that means disabled...
-Why 2 chips are disabled on 4.66 S7 ??
-how can cgminer see this chips like that "o" OK not "x" or "-" when these are disabled ??
-i check routing for pcb production problem but other chips not wired to gnd..


(white paint is boron nitride for dust and thermal conductivity forcer and also use for shortcircuit protection from heatsink contact)
so, any ideas ? (i think i found a HCN "hash counter" stopper for dead chips) Big MAYBE

[adaseb]

Probably going to be impossible to re-glue any heatsinks that fall off.

[Cyper_BLC]

Probably going to be impossible to re-glue any heatsinks that fall off.

No, i did that before on my B3 4.86, i made a thermal glue with AL2O3 from reading orginal elecolit MSDS.
if you want to know how is that, i can provide pictures again
it tooks 4 days, 54 chip re pasting is very hard work.

like that , this is my thermal paste 6 times higher thermal conductivity from bitmains black shitty epoxy. 3 times higher then B1 white epoxy.
and also i remove chip cover too.



https://bitcointalk.org/index.php?topic=1165628.msg13230506#msg13230506
https://bitcointalk.org/index.php?topic=1165628.msg13478078#msg13478078

[yslyung]

how difficult was it to remove the heatsinks ? might use custom waterblock with chilled water running thru the blocks. heh.

[adaseb]

How did you remove the original epoxy though? Looks like you can easily damage the chip if you apply too much force.

[SLEI]

But what can we say really. Has anyone actually tested a batch 8-16 Antminer S7 with a one fan?

I agree though that I wouldn't run mine with just one fan either.

Anybody brave enough to test this?  

I tested one fan on my batch 8 which only took 1200W from wall but it was about 70C at 20C room with fan at full speed and I didn't have balls to run it that high temp.

Batch 16 April fool miner??

Batch 16 warranty:

"3. In some cases, the warranty will be void

 c. Burnt parts on hash boards or chips"

[notlist3d]

But what can we say really. Has anyone actually tested a batch 8-16 Antminer S7 with a one fan?

I agree though that I wouldn't run mine with just one fan either.

Anybody brave enough to test this?  

I tested one fan on my batch 8 which only took 1200W from wall but it was about 70C at 20C room with fan at full speed and I didn't have balls to run it that high temp.

Batch 16 April fool miner??

Batch 16 warranty:

"3. In some cases, the warranty will be void

 c. Burnt parts on hash boards or chips"

That is nothing new on batch 16.  They include " c. Burnt parts on hash boards or chips;" in other batches aswell on warranty.  It gives them the right to reject RMA if they think was pushed to far or in bad conditions is my guess on reasoning.

So nothing really new there.   The one fan is the new part.

[Cyper_BLC]

But what can we say really. Has anyone actually tested a batch 8-16 Antminer S7 with a one fan?

I agree though that I wouldn't run mine with just one fan either.

Anybody brave enough to test this?  

I tested one fan on my batch 8 which only took 1200W from wall but it was about 70C at 20C room with fan at full speed and I didn't have balls to run it that high temp.

Batch 16 April fool miner??

Batch 16 warranty:

"3. In some cases, the warranty will be void

 c. Burnt parts on hash boards or chips"

That is nothing new on batch 16.  They include " c. Burnt parts on hash boards or chips;" in other batches aswell on warranty.  It gives them the right to reject RMA if they think was pushed to far or in bad conditions is my guess on reasoning.

So nothing really new there.   The one fan is the new part.

yess this is not new.
https://bitcointalk.org/index.php?topic=1165628.msg12982754#msg12982754
First version 

second and last improved version 

[generalt]

the S7 fan design is a "suck air" + "blow air" method, no?

which fan are they removing?

sucking or blowing one?

no punt intended 

Looks like the blow/pull fan is removed to me.

[NotFuzzyWarm]

Um, anyone looked closely at the pic with fan removed? https://bitmaintech.com/bm_tech_admin_at_123/userfiles/image/MAC_00507.jpg Pretty crusty looking. 
Looks rather 'well-tested' to me....

[mavericklm]

Error 1011 Ray ID: 28c8856c4103062e • 2016-04-01 02:13:19 UTC
Access denied
What happened?

The owner of this website (bitmaintech.com) does not allow hotlinking to that resource (/bm_tech_admin_at_123/userfiles/image/MAC_00507.jpg).

Maybe you should have saved the pic!

[aarons6]

he means this one and yes its a horrible pic to use.. it looks like its been used several months.



i dont care if its 100$ off, if i got one looking like this id be hella mad.