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I was wondering others' thoughts on this new model.  At the ever dropping but currently 1.386BTC cost... its a tempting purchase.

I understand they are trying to cut costs... but...

I think the single fan is a bad idea.   I rely on the fans on either side to attach ducting and for it to handle the fact I have ducting to and from the miner on both ends.

I think the open outlet is going to be creating an issue for people without passive cooling in the room/space.   Presently my 5X7 room I have my S7's in do not get above 78*f on hot days with the miners closed in there..    Having to manufacture a new outlet housing or gut an old fan body to make an appropriate ducting attachment.... is going to be annoying.

Any opinions on running the fan solely as a puller fan, and not a pusher (oriented to the miner)????   This would 1/2 solve my issues;  because its easier to manage the heat through the exhausting;  not as much as it is to duct cold air into the fronts.

One of my hosted S7 had a shot fan and one down board. It still ran hot with only two boards powered. I wouldn't run a one-fan S7 on stock clock south of the Arctic Circle.

I was temped to order another S7 but with only one fan now I don't think I want to take the risk.  I wished they would elaborate on why they decided to go with one fan only.

I would guess was to lower production cost.  If they make thousands of miners and cut fan cost on each one that could add up.  How they will run we will see once people start getting them.

I would guess you can add a second fan: https://www.bitmaintech.com/productDetail.htm?pid=00020160105104607947aoAkWsJK06D0 .  I can't imagine them taking fan pins off IO board, but we have not seen the batch yet so can't confirm that.  It is just a guess.

The problem with ordering a fan from them though is the shipping that they add to that price.  At least the last time I checked they charged a lot for shipping just a fan.  Would have been better off getting a batch 15.

Don't worry, there are so many fools and suckers who are buying these 1 fan S7 miners. Bitmain Chinamen are laughing all the way to the Chinamen's Bank.

They are doing me a favor I have more then 13 fans on hand.  but the price drop needs to be to 560 not 575.

Anyone think repurposing the fan from a push to a pull config would be much of an issue?

With the amount of heat the S7 puts out;  I couldnt ever imagine running mine on just one fan.    Then again;  50% or less fan speeds are common.....

Maybe that's their way to telling us that we must just deal with the noise it makes....

Honestly, I don't like this move at all. It looks like a marketing gimmick to me. Recently prices of S7 have been lowered and now they removed one fan just because they know, people will (have to) purchase extra fan from them as well and as result, they'll be selling it at a win rate (not sure how much shipping will be added for a fan though). Never underestimate power of fan when it comes to air flow, it's mandatory IMO.

It's just mining getting more and more industrial and less home user friendly  :-\

It's more energy efficient with one fan  8)

Just drop the freq to 500 set the fan at 50%

Should mine  ;)

Yeah it's more energy efficient, until temps go up, and the chips start pulling more current for the same work and cancels it out and then oh also you have a hotter machine that's more likely to die early and possibly catch things around it on fire. Definitely an improvement.

I look at it and i see a prisma with temperature sensors :D

If they are using good thermal adhesive and a good fan, it ain't impossible after all.
Avalon 6 comes with a one fan and at least my temps are at reasonable level.

Avalon6 does well with 1 fan, but it's also about 30% less heat. The S7 (current design) has quite a bit more solidity of the airflow path, which means constriction, which means more pressure needed to move enough air through to adequately pull heat away. If they've worked it out to where one fan can do it without bursting into flames, that's great. But what's the practical upperbound for intake air temperature?

yes it is tru the avalon 6 has 1 fan but it has huge massive heatsinks. It also pulls 1000 watts or less at the ac plug.

the s-7 has 140+ heat sinks  and it pulls 1400 watts or more at the wall.

Like I said in my case I have lots of fans so it is an easy fix.

But the price drop of 7 dollars is insulting.

It should of went to 560 not 575

sidehack has a good point  if your mining room is 70 f  or less you may be good  but if you have a 90f or more room you will suffer.

Comes down to drop the freq from 700 to 600 maybe 500 or add a fan

We are making an order with coupons (many emails with BMT in last two weeks). Here is what we found:

Its not a april fools joke, it is called AntMiner S7-F1
Low noise
identical performance with low power (6000 RPM fan)
Low weight&size (may have effect on freight cost for large order?)

The fan is not same (don't know the other one):
http://www.digikey.com/product-detail/en/delta-electronics/QFR1212GHE-SP01/603-1165-ND/1850534

BMT also wrote on Twitter.
https://twitter.com/BITMAINtech

I try to upload pictures when we receive miners (this is a new account).

It is more about being the lowest price S7 I think vs other things mentioned.  Likely they save a good amount of money selling thousands with 1 vs 2 fan's.   It's all about lowest production cost.  And coupons make lowest S7 miner price so got more attraction (at least lowest price with batch being sold).

I suspect after I thought about it they might have been testing this design for next gen.  Think about when they are designing next gen if they can keep one fan vs 2 for tens of thousands of units that will add up on savings again.

Yeah, like they tested S7 heatsink design in S5+

And the 3 hashing boards per miner they tested in them, which I have actually have groan to like.  Took me a while to get use to it but at this point with having big PSU's around and 240 I kinda like the power of having 1/3 more in each unit.

Only thing I wish I could get them to do is use RPI's as controller as easy to get replacement and sd backup is so easy.   But I think BBB are here to stay.

They say 1 fan is naturally more quiet than two fans. Since fan noise is greatly dependent upon rpm, I wouldn't say, that one fan running on higher rpm is necessarily more quiet than two fans running on lower rpm.

Bitmain really did cut the price down to the bare minimum... maybe next they'll take the stickers off and save a few pennies on their future miners. Yeah, the boards will probably run real hot and it'll take either a cold room or a freq frop for them to run at a good temperature. I'm sure most people will just install their own fans so the 1 fan won't be such a big problem. Looking at the S5, it's also running on only 1 fan so besides slightly higher temps the miner probably won't suffer.

I have ordered 5 S7 miners of the 1 Fan.

Delivery is fast to my area.

Expected delivery is Thursday.

Fingers crossed

Yeah but the S7 generates 2-2.5 times the heat of an S5, so that's by no means a valid comparison.

590-620 watts  vs 1300-1450 watts

pretty big difference.

I just think the fan will move at 5200rpm nonstop

 and people will need to downclock.

I would buy one from them at 560  but not 575.  My stock of add-on fans would work.

I feel the drop from 582 to 575 covers the diff and the price moves but not the missing fan.

price truly needs to be 560.  I have 34 coupons sitting in my account.

34? yikes, shoulda sold those if you're not planning to buy a s7. maybe the price will drop a bit more and you could take advantage of the situation.. or resell them and make a profit. people are buying for 650$ still on other websites like amazon and ebay :) hopefully none of these overheat or the fan isn't too loud, waiting for a few reviews and even then i'll only consider buying one of these.

I am one of the aforementioned fools and idiots who purchased an S7 with one fan.  And I'm probably going to get another.
I have them hosted so this is not an eyewitness account.
I have one S7 Batch 3 or 4, don't recall.  It runs at 4.724 Th/s and the temps are 61, 58, 58.  Never had an issue.  Good miner
The new S7 Batch 16 runs at 4.723 Th/s and the temps are 63, 61, 64.  Now it's only been 2 days, but so far no issues.
Are they saving money?  Of course they are.  Is the miner shit?  Doubtful.

Still doubtful about this new miner, keep updating us about it. I still don't trust this new "wonderful" price that Bitmain has given us, something smells awfully fishy. If there are issues soon, tell us about it. Otherwise i'll go fish myself a coupon or two and buy one, it'll be nice to put a few s3s out of my rig and replace them with a single s7.

Proof that there really ARE many idiots in the forum. For your information, the S7 miner really IS a piece of shit. I have a few S7 and some Avalon 6 miners. A6 is a much better built machine. S7 is junk, in comparison.

Then I have made a dreadful mistake.  Thanks for shining light on my error cheap talker.

Will do.

Ya, guess I made that mistake too... but then I couldn't bring myself to spend twice the price on a miner that was just as efficient as the S7, on the other hand if I were buying at ~$1k per S7 then I would be leaning harder towards avalon. Mostly for better support of cgminer and the basic virtue of not being bitmain. But none of that matters because the S7 is ~$530 shipped to the US if you can snag a coupon on here and in the days of efficiency and cost being king there is simply no contest S7s all day

All you greedy f&ckers are being f&cked in the a$$ by Chinamen Bitmain, hope you njoy it!!!

I have a few I'll give away if anyone wants one.
Talks_Cheep?

This is an incredibly cynical move. This move is worthy of the shady Dan Ackroyd SNL character who used to market products with questionable safety profiles. Especially coupled with the coming northern summer.


 BM is essentially factoring in that the useful life time of this miner will be the shortest of any previous model.

In addition to the higher fan speed previously mentioned, with one fan, a failure of an individual chip heatsink would be catastrophic.  Now you have to wonder about how much of a fire hazard this thing is.

A potential cheap bandaid might be this ebay gizmo: http://www.ebay.com/itm/AC-110V-Digital-C-Temperature-Controller-Temp-Thermostat-Control-relay-Sensor-/380665672071

The relay in this controller could be use to either power down the AC feed to a network switch or switch a relay which directly powers down the miner AC feed.

I also don't get the business case. So let's say you save $5/miner. Say the your miner cost is $300. So you are betting that any increase in this one fan miner warranty return is less than 1 in 60?


From an informational standpoint, this urge to push out miners and not be concerned about the long term reputational impact? Very strange.

I have several coupons that I will sell for .06 BTC. PM me if interested.

If Eligus will ever pay out I will buy one of these... S7 that is.

AFAIK the coupons for physical Antminers are $100, the $115 ones are for Hashnest.

And yes, you can use one coupon for each miner.

I've got some coupons, PM me an offer for them.

my question is. why the 1 fan all of a sudden.

If the machine could run well on 1 fan why have 15 batches before with 2 fans.

Is this in preparation for a new unit to field test with 1 fan. will be interesting to see how these function in a home miner environment where heat can be an issue at times.

Logically, remove a fan means that the other will run faster to compensate, which will make more noise. (Knowing that, saw the actual acoustic level of the S7 with 2 fans, this increase a little more did not matter much  ;D)

The second problem more hassle is that it will limit the maximum room temperature. In the summer it may be more complicated.

Those which connect the ventilation ducts... to miner  will also have more difficulty because the pressure capacity is divided by 2.

Bitmain wanted to reduce the price as much as possible, so they made a batch with as few parts as possible that could still operate. Buncha chinese cheapos, but the good news is it runs at a higher decibel level but at nearly the same temps. In summer temps may become a problem but it works for now.

I know you think you're being funny, but I'm done/finished giving my good money to shady/sleezy Chinese Bitmain Tech m0therf@ckers. They takes your money, f@cks in your a$$, and you say "Thank you."  Y'all are Disgusting.

Who woulda thought, two years ago, that we'd be considering Avalon a less evil option than Bitmain?

Would a S1 fan add any value to the cooling process?

No, but an S4/S5 would.

It doesn't look like it has the screw holes to mount a second fan on the rear.  I guess it doesn't have to be mounted or you could just tape it or zip tie it there.

Just got my shipment notification so I will let you all know how it is. Should be here Thursday or Friday. It will be running in my garage here in North Carolina so it should be a decent stress test.

 
@ mtmining2

try fan speeds  65 to 70% was top speed on batch 1 to batch 15

so


clock the gear to freq  500 fans to 70%   check temps under 65 c    fan rpms  about 5500 and errors less then 0.0100
clock the gear to freq  525 fans to 70%  check temps  under 65 c    fan rpms  about 5500 and errors less then 0.0100

see how high you can go with freq and keep temps under 65 c
see what you need to get  fan to do 5500 rpm  as this new delta rates 6000 rpm

 

buying this to think you will certainly do freq 700 is foolish

adding a second fan looks like  a project but possible.


@ generalt    finally tested the 2 gpus will send a pm

@philipma1957 That's the plan. Will start it out at ~500 and whatever % ends up being top speed for the fan and then work the freq up from there.
I have pretty decent ventilation in the garage so it doesn't get too hot but we will see. Also may have to wait a bit for a real "stress test" as the temps here aren't supposed to be over 60 F for the next week or so.

Now, if it won't do 700 then I may rig another fan to it... I have a few spares now so what the heck...

hmm.. my S5 is still kicking. S1 died so was thing of using that that fan.
I shall wait and see how this S7-F1 performs in ZA temps.

Won't you lose significant hashing power by dropping the frequency to 500. Thus reducing bitcoin profit?

Yes but finding safe numbers to not burn the miner is more important

Just buy a 120mm Noctua fan and put it on the miner. Save a lot of time and you won't have to deal with the freq and such. Or buy a cheap 120mm industrial pwm if you don't care about noise. I dunno if there's a place for a fan on this miner, but I doubt Bitmain would make a new chassis just for these batches.

wrong no place to screw it in = fact

you will need to figure a way out on how to attach it.

yeah, the summer is coming fast...
this fan is supposed to be 6000rpm vs 4500 for the two fan ones.
4500 rpm (two fans) were producing incredible noise at >=72dB.
I wonder how 6k rpm fan sounds like?

Probably about like a couple SP10.

looks like they just replaced the back plate of the unit which had the screw mounts for the fan with the new grating as it is using the same mounting holes as the previous backing plate (right in the corners)

Then adding the Sanyo ace that I supplied for the last avalon6 group buy should fix the issue.

Rumour has it that Bitmain is planning on releasing S7-F0 model for the next batch.

you wont be able to mount it with screws but i think small zip ties would work to mount the fan to the grate.

Any word on the specs? How often do they release new batches?

his comment of an s7-f0 is a joke. saying that the current version (16) is the s7-f1 (one fan unit) with the s7-f0 (being 0 fans).

but as far as batches. they seem to have a new batch lately every 2-3 weeks. Seems to be every production run is a new batch. ie they have 1000 made and thats 1 batch. then another 1000 and thats another batch.

Thanks for the clarification. I totally fell for it.  ???

Noise    64 dB(A)
http://www.digikey.com/product-detail/en/delta-electronics/QFR1212GHE-SP01/603-1165-ND/1850534

OK, thanks, it is very helpful, but I find these numbers by manufacturers to be understated by at least 4-6db.
I checked multiple fans before and "real" number during mining was always 4-6db more than what was stated in the specs list.

That Noctua fan you linked is only 40mm. It simply does not cover enough area. Besides, it only moves 8.2 m³/hour versus the 120mm Delta fan which moves 5.96 m³/min. That is why it is so quiet.

So we're thinking this 6000 rpm fan is quieter than two 4500 rpm fans?

the unit will be loud maybe lower then the two 4500 ones but loud

Downclock from freq 700 to freq 625  will most likely prove the best way to use this miner.

 I may order one just to see if I am correct.

I'm tempted to order one myself but I'm trying to hold out for a review on the noise and the heat first.

been tossing around the idea of getting one as well. waiting to see the results for heat issues. since the backplate has been replaced you cant attach a fan easy. would rather not have to downclock it just to keep it functional. for that ill get an Avalon.

maybe they will realize the error of their ways and the lack of urgency to purchase this version and bring back the 2 fan in version 17.

So, just got the S7-F1 hooked up and running. Temps are low today, in the 60's so I went ahead and let it ride at 700 and it's holding steady at 59c on the highest blade with .0005% error rate. Going to let this go for a bit as the temps will rise into the 70's next week. I will keep you all updated on how it goes. As for the noise it does seem a bit quieter than the others but since they are all on the same rack it's hard to tell.

Also, the packaging was all updated, new foam, smaller box etc... So this was definitely not just a stop putting one of the fans on redesign

Thanks for the update. I'm very interested in seeing how they perform.

That's good to know. I will get my S7-F1's a few days later.

What are your thoughts on the overall build quality? Was it comparable to previous batches or better/worse?

I would say it's the same. Time will tell though...

what/how does the backplate look like. is it a completely new panel or did they slap the grate over the old one? (can you screw mount a fan to the back?)

If possible many of us would love if you could post some pictures of it.   If you could get all 4 sides and a few extra shots would be a great addition to this thread.  If you have a decent camera please think of this :)

As soon as I get back to the house tonight I will do that. The backplate looks to be a new panel. Does not look like it will be easy to add a second fan, there are no pre-tapped places to bolt it to anyway... you might be able to take the backplate off and attache the fan to the plate with some washer/nut combo then reattach the plate but that would be about the easiest way I could see of doing it.

LOL they put a warranty sticker on one of the screws:

https://meem.link/i/a/ZwPVo.jpg
Edited 2020-11-28 to fix a broken image

As you can see the ~1mm thick grille is screwed into the case just like the front plate to which the fan is attached:

https://meem.link/i/a/wa9nD.jpg
Edited 2020-11-28 to fix a broken image

To properly attach a fan to the back you would need a similar plate, or perhaps long bolts with large washers could be used through those hex holes.

But to avoid issues with the warranty I think I would just use strong zip ties.

Closeup of one screw:

https://meem.link/i/a/8ptgH.jpg
Edited 2020-11-28 to fix a broken image

Miner is not mine (pun intended) and sorry for the greenish pictures, crappy phone was all I had.

Edit: forgot to take a pic of the controller but there is a 4-pin header for the second fan.

that confirms what i assumed. a whole new backplate.

might be able to put a fan on there if you use zipties instead of screws. Find some thin zipties that will fit through the rear screw hole and ziptie it to the grate.

Thank you for posting I wondered what they would look like.  I am not sure what to think of new blackplate with warranty sticker.  It does seem adding a second fan like I thought might be a good idea... will void warranty so crappy idea.

Guess we will see how they operate with new higher RPM fan.   Hopefully it all runs good and 2nd fan we see is not needed.  I don't have one to test out but some might be like my mining area using lots of CFM's to cool miners.  Hopefully if one would fail in my mining area the CFM's from big fan's would still keep it in a safe zone.  Or at least allow it to safely turn off without getting horribly hot.

 So I know how to attach a fan with no damage to the warranty sticker


http://www.mcmelectronics.com/product/83-11829?

then use 3 of the four included screws leave the warranty one alone

put a grill on the other side of the new fan with four small thin zip ties.

this fan from amazon is good

http://www.amazon.com/Sanyo-Denki-SAN-Ace-120mm/dp/B00YOC80IO/ref=sr_1_2?

do you need to do this ?  I have zero clue

but I think if you do this the machine will be easy to over clock

The grille screws are about 120mm apart, but the distance between attachment holes on a 120mm fan (and the spacer probably too) is about 105mm. You can see the difference in my second pic. Unless I misunderstood what you're suggesting.

Okay back to the drawing board.

Well four zip ties to the grill and the gasket may work.

Yeah simple and cheap and I think good enough to last until doomsday (aka halving).

So I will have a couple of fans from S5's that had bad boards. I think I should be able to re-use one of them as a second fan for the Batch 16 S7?

At any rate, I will probably buy a couple, so I'm grateful for this thread.
Also have a few coupons I can't use. Asking .04 BTC. PM me if interested.

I just received few miner of the 1 Fan batch.
After testing and setup, the fan run at full speed 6000rpm. It's REALLY noisy.

I'm missing the 2 Fan batch now.

http://www.mms.net.my/bit/IMG_4269.JPG
http://www.mms.net.my/bit/IMG_4270.JPG
http://www.mms.net.my/bit/IMG_4271.JPG
http://www.mms.net.my/bit/IMG_4272.JPG

will be interesting to see how they handle as you add more and ambient heat increases. board 3 is definitely a bit hotter then the rest, seems like the fan isnt hitting that area as much


how is it running? within spec and low hw errors?

Well supposed to hit 76F here today and i have one of these one fan units and two of the standard two fan S7s running in my garage so we shall see how it does. It's at 700MHz currently cause it's been rather cool but I will be watching throughout the day and adjusting if needed. Will post back with what happens.

So outside is ~71F and the miner is holding with two blades at 60c and one at 56c. Clock still 700 and fan at 5400 hardware errors at .0007

What is ambient in the room its running in? how many miners are running in that area?

can't know for sure as I am not there but it usually sits a few degrees above ambient, it's a garage with a box fan in one window sucking air out and the miners exhausting toward the fan with another window open to let air in. Nothing fancy but it ventilates fairly well. There are two other two fan S7s in there with it.

To install another Fan you need to un-screw all 4 screw. In this case, the warranty is void.  :'(
Look good, after install second fan. The noise is about 75 dB, temp about 63 degree. Room condition is about 28-30 degree.

http://www.mms.net.my/bit/IMG_4274.JPG
http://www.mms.net.my/bit/IMG_4275.JPG
http://www.mms.net.my/bit/IMG_4276.JPG
http://www.mms.net.my/bit/IMG_4277.JPG

Damn that is loud! 75dB.WOW! going to cry with this one.

how secure is it? does the panel go back on flush?

are you able to use smaller zipties and tie it right to the inner grate pieces?

A few quick observations on S7-F1 / Batch 16:

- The heatsinks have changed. Specifically, the package-side sinks (the tall, lighter colored ones) have thinner fins and have a T-top central fin like the darker sinks. I believe the new design means less of the air path is obstructed and theoretically that means lower pressure drop through the box. I think this is the primary design change enabling single-fan operation.

- The hex grill on the exhaust side has obstructed columns, presumably to influence airflow patterns further back in the box. The grill is asymmetrical and has small notches along one side to indicate alignment with the hash boards.

- The silkscreened version text on the hashboards still reads "S7_SP0WER_HashBoard_45_V1.3" as it has at least since Batch 8

- The controller boards are still labelled "S5+_CtrlBoard_V1.6"

- The fan header for the 2nd fan is still present.

- The shipping weight is down to 7lb14oz or about 3.6kg; the new boxes are 35.8x21.5x25.5cm, 4.2cm shorter end to end than the two-fan boxes.


I'll get pics and look for other labeling or component changes as time allows.

I am thinking about purchasing an S7 but not sure to go with 1 fan batch 16 new or look for a used model that has 2 fans?

I am also wondering if a multiple atx psu configuration is capable of powering this miner like the S5?  Older models seem to call for around 1210 and the batch 16 seems to be around 1300.  I was thinking of using 3 750 gold thermaltakes, 1 for each board, does that sound doable?

You will need 10 PCIE plugs.
3 per board and one for the controller.

Currently in SA we are moving into winter.
Temps range from 17-30C ambient.
My S7 F1 is running at 66-68C most of the time with little outdoor air intake.
Set the fan to 80% (4800rpm) and the temps run up to 71C.

is it acceptable to run the s7 at 71 C?  I am trying to sift through the main s7 thread but it is over 400 pages and is going take some time, so please excuse my possibly already asked questions.  I'm not completely through the s5 threads and though different miners it seems concesus to keep under 65.

Has anyone else recorded any temperature differences between the F1 and F2 batches?
Or, has anyone ran one hard, overclocked, and checked heatsink material and bonding?

Southern Mid-West summers are brutal. Even though I will be experimenting with a swamp cooler this year, I cannot handle something which I know is going to run 10 degrees hotter.

I have read in this very thread that they can run up to 80C. Not recommended for long periods.
Mined did run into the low 80s for a few hours. i quickly dropped it down from 700mhz to 650mhz. that dropped the temps to 70C.
On Average I am running them at 64-68C @ 80% fan speed.
Weekends they run @ 64C @ 90% fan speed.

As Midwesterners we are moving into AC season so we should be able to correlate the season transition as far as s7 temps vs. ambient temp.  I have an s5 running with a box fan blowing air at the miner and pushing most of heat out of room where there is open window exchanging ambient air in/out. with outside temps 75-80 F the s5 temps are 49 -53 C.  I also have an s3+ OC running along side with temps 38 - 42 C.  What I am saying is the s7 f1 should be similar to stock s5 with my setup moving into AC season I am wondering what to temps to expect from a s7 f1 with ambient temps maintained 75-80 F.  With the s5 we strove to keep happy under 65, and I'm well under that so if I get an s7 f1 and achieve under 70 is that baseline to seek?

or should I look at also buying the second fan option from bitmain and either wait 90 days before voiding warranty in the meantime underclock to maintain safe temps?

under clock it to 550 and set fan to 90% and see the temps.
Push up the freq once you are comfortable with the temps.

My S5 is under clocked to just under 995Gh @ 56C in the same room as the S7-F1

Thanks KeezAZA, that is exactly the comparison I was looking to hear.    I am now confident with ability to work way up to stock settings I also can keep temps in comfortable range. I think I have my bases covered, power, temp control next, I'll have to find a couplon then order from bitmain.  That puts me at ease, I think a s7 f1 will be a good fit and finally upgrade to a new machine.  Thanks again for info.

You welcome.
Happy mining!

 :) found a coupon and ordered the one fan s7.  I was going to get the back up fan as well as second fan and back plate, but shipping was ridiculous for the add on.  I'll post some temps once it comes in for the benefit for fellow Midwestern hobby miners.

I've read in the main thread about orders that don't show up correctly, but as long as it's confirmed in the block chain everything is good to go?  I ordered on the 4th, now it's the 11th just wondering if it is typical for orders to take longer than the "ships within 5 days" to ever show shipped.  My status has showed, since the order was confirmed, as paid, unshipped, expired.  now it shows paid unshipped valid.  That is the extent of content on bitmains order page other than general information such as order id, pay address, price time created.  Im just wondering when I might expect this batch 16 miner to arrive.  It does suck that the batch 17 has 2 fans, maybe i'll get a coupon to order the upgrade, if it does become available. 

finally, received tracking number and unit has been shipped.

oddly this current sale run has two fans again....

Thats not a bad thing. From personal experience the 1 fan units have more issues than the 2 fan units by far. Out of 36 test units we have had 3 show bad chips and one go into nuclear meltdown in the first two weeks of having them. Meanwhile the 2 fan S7s i run just sit in their corner and hash away happily.

I personally like a fan on the exhaust side because I can duct it out to a roof vent.....  It would be my preferrable position, but forming pressure inside the box instead of taking pressure away; is more efficient for cooling (air density rules IMHO)

Up and running.  Out of the box, factory settings (700) my temps are 57,59,60 fan is 5640 rpm.  4689.35 gh/s It has been running for 30 minutes, and have had 14 hw errors (.0007).  Pool difficulty just went to 32.8 K from 16.4 K.  I don't know what difficulty is good setting to run at pool side, but i'll jump around over the weekend and find which one it is happiest? 

I set this one fan S7 just like my S5 with a small box fan blowing air directly at the front of miner about a foot away.  The miner is running in a closed off garage, but open to the main house.  Out side temp is 77 F with an ambient temp of 87 F in the garage.  House is 78 F ambient and fan is blowing the cooler air at front of S7.

I don't have a meter to measure db, but it sounds at least as loud as my S5.  I will look into flexible ducting to sound proof.

if you can get a kill-a-watt meter on the miner, it would be nice to compare wattage draw to the two fan models.   I doubt much difference, but worth a look.

I am using 3 750 gold thermaltakes, on two circuits, but I only have one kilo-watt meter.  The outlet my meter is in now has two PSU's each powering 1 hash board and reading 877 so two of the 3 boards are  438.5 per unit at the wall.  I assume the third is drawing a bit more since it is also powering the control board, i'll take that measurement tomorrow.  The form letter packaged inside with the miner said to expect 440 per board so I am using just north of 1300 watts at the wall.

Just under 6 hours temps are about same, 58, 60,61.  139 HW errors (.0006)  4709.82 gh/s (700 clock) diff 16.4 K

I let the miner run for 24 hrs before powering down and switching over the kilo-watt meter.  Right now the 3rd psu that powers the first hash board and controller board is pullin 462 at the wall.  My S7 F1 appears to be using 1339 watts at the wall with 3 750 gold thermaltakes.

Temperatures have went down with ambient temps directly above machine of 80 F, I have 55, 57, 58 with fan @ 5280.  Nothing has changed other than a cooler day so inside temps of garage didn't climb.  The sound level I think is much better and even though my temps appear in the good, I will probably down clock next and try to find that happy place. 

Oh, the longer the machine ran, the better the gh/s got.  Before reboot and changing meter I was up to 4715 gh/s (avg) @ 700 with .0006 error %

Does anyone know the difference between the "1 fan" and "2 fans" firmware that you can download from their site?  It looks like you can just put a second fan on the 1 fan model, it spins at the right rpm. 

I believe the one fan firmware only applies to batch 16.  If I am not mistaken, the 2 fan firmware can be used for all other batches, but specifically for those that choose to add the second fan to batch 16.

i have played with various BB boards on my S7 and the most recent 2 fan firmware works fine on my 1 fan S7.

so long as there is one fan reporting some sort of functionality you're golden.

I can confirm that you can just add a second fan onto the F1 and it will run just fine. I have done it to 18 of my F1s and it controls the fan and reads rpm properly.

On a side note, you do not need to go the ghetto zip tie route to hold the fan on. If you are taking the plate off and voiding the warranty already you just need to get some of those short fat 120mm fan pc mounting screws (we got ours off of old cointerra fans) and screw them in from the backside. You can only fit 3 of the 4 screws but it is totally stable with no wonky zip ties preventing everything mounting 100% flush


https://i.imgur.com/15IQlHi.jpg

https://i.imgur.com/aK4ccNe.jpg

It should work fine with another fan on it.   I am testing "stock" right now but plan on trying a second eventually.   So that is in "store" to do.    But so far the one fan seems to work fine.  It is higher RPM and I have not experienced problems let it running on auto with speed.

what fan are you using?

The second picture has all the info on the fan.

It is a delta 3.9 amp

I was going to add another fan.