Topic: Swedish ASIC miner company kncminer.com - page 1697. (Read 3049501 times)

Thanks crumbs. When you say "squirrel cage fans" I assume you mean the blower type fans like on the reference ATI GPU's?  I must agree these fans are awesome (I have some 7970's with this system and it is great)

Those would definitely work, but that seems a costly and time consuming solution, and as you mention, downtime is a big deal...

It's all pie in the sky right now until they actually deliver but thanks again for some good ideas!

(*edit*) - on second read, I would likely go with your option #2. remove the case , flip the fans on the first 2, and remove the front intake fans and position them above the gap in between the front and rear hashing units to supply fresh air.

Hanau450? I don't get that

I've read your posts, here are a few cooling ideas:
  1. Squirrel cage fans:  These things are ideal for being ducted in tight spaces, the graphic cards folks love them.  I've also used them (as suction fans) on horizontal heatsinks -- the updraft design is not ideal, but not horrible either, and lets you route the exhaust very easily.
  2.  If you're stuck with the provided coolers, and are running the gear at home, with the cover off, consider rotating the front boards 180 degrees (actually, just swap the fans to the other side), so the fans are blowing out of the front & inhaling from the center.  You'd have to also flip the front case fans (if any), so they're blowing out.  Scrap (probably unbolt?) the new case divider baffles.
  3.  If the rates are going up as fast as they are now, it's important to have the absolute minimum of initial downtime, so simple fan-flips (and the push-pull fan arrangement you've mentioned) sounds like the way to fly

I think we have a bit of a communication disconnect going on here.

I do not want " individually hand packaged for the odd request with pink bows and ribbons."

I want them to simply ship me the boards (I can supply the pink bows and ribbons myself - thank you very much


All I'm saying is that I think their case design is substandard, and I will likely be throwing it in the trash as soon as it arrives. Why go through the bother (and I think extra chance for damage while shipping of those chips or boards attached only to the base of the case with no support from the top or sides as it seems to be.)

Just put those boards into some well cushioned boxes and ship them. no need to assemble. If anything it would speed up shipping. They can just set the chips in the boards, test them for however long, then ship them.

do you get me now?

Of course not, by all means modify the case. I want to run a MAME cabinet around mine, it's a great functional and aesthetically pleasing way to disguise the units housed at home instead of an ugly pointless server cab, but KnC aren't about to perform individual requests as they scale a production line to complete all orders in two weeks, that would be crazy, and no one here would be happy with such bespoke requests. We all just want our kit sooner, rather than later, boring brown paper surrounding bubble wrap and aluminium, not individually hand packaged for the odd request with pink bows and ribbons.

Their case is basic and does what it says on the tin. It's not for winning beauty contests. I'd forgive BFL a little for their aesthetic choice had they not royally screwed everything they possibly could with respect to power and heat, because BTC hadn't blown up at their point of ASIC conception, it was still a geeks wet dream and time wasn't a monster factor. After Cyprus it has been, which is why XCrowd's fake offering was laughable.

The fact BFL still place aesthetics over function is moronic. None of the competitors have any ASIC hardware experience - as in hardware aside, and supporting the chip, i.e. supplying power and controlling heat, which is why Hashfast and Cointerra will not reach their simulated performance claims. It's also why they are dumping chips over building products, it males their life easier and puts the onus on some other poor sod.

By all means they are welcome to surprise me, but what few products they will build will likely not survive in the long term if they aim to deliver on their simulated claims, again this is why you'd want rid of warranty, because that kind of heat will significantly reduce the stability and lifetime of the chip. Bold marketing claims and performance longevity do not go hand in hand.

KnC aim to under power their design and over deliver on their claims, sure you can push it if you want, but do that gently as with any product that runs 24/7, extreme power and heat kill chips.

Wasting of money for a miner. You wont recognize the loss of 5 mins not hashing 

Don't fix what ain't broke.

OK, just been thinking about this problem for a bit and my best idea so far is to use a "double-decker" design. 2 hashing units, side-by-side, with the other two sitting on top. Allows for a cube type case, allows 4 intake fans (or perhaps just one big box-fan) and a very simple, straight-through airflow. Might not fit in a standard rack but it's incredibly more efficient and clean design.

I agree with the linear idea but at least they started thinking about thermal airflow now.  I just wish they had started sooner like when I first mentioned it looking at the CAD pics.

Just a question: why no hosting(knc or local)? All these extra costs & risks.

Well, in my experience/neighborhood, when my power goes out, so does the whole neighborhood and the internet.  I have Comcast and that's what happens, but I understand your point.

I am definitely planning on either modifying the case or building a new one, I do not like what they have done with that layout, (though I do not particularly care. Please do not bother to try and fix this KNC, just worry about the chips, and ship as soon as possible)


I'm not really gonna start anything until my Jupiter arrives, but here are some initial thoughts:

 - Put an additional fan on those heatsinks for push-pull action. - In my experience with those kind of heatsinks this is usually good for 2-3 C reduction in temps.

 - Aim the fans directly towards the case exhaust. - Still can't think of an easy way to do this with the current case. Someone already mentioned turning the heatsinks 90 degrees and blowing out the sides. Maybe this would be good, but I prefer linear airflow, It's tough to know what's really going on inside the case and sometimes you will create dead zones where the heat just pools up and does not escape.

 - Keep the PSU external - This alone has dropped the temps in my avalon by 4-5 degrees, less constricted airflow is a good thing.

 - - - come to think of it, I think tolip_wen had the right idea by ordering Saturns. It's a really huge case for just 2 hashing units, but it's a much cleaner design.

Very interested to see what others will come up with for alternate case design.

(*edit- I would actually prefer if KNC would just ship me the controller board and the hashing units individually packaged. They can keep the case. Less hassle for them (no need to assemble) less shipping cost probably, and less chance of damage while shipping. Does anyone know if they would offer this as an option?

80+ power supplies are most efficient at 50% load, if that helps with your decision.

I hate fan noise so the plan is to have the PS fans at low dB.
I have spent too many years on a raised floor surrounded by 9million fans,
and on weekends I hang around on turbo prop aircraft.
What am I doing mining if I hate fan noise??? Who knows?
Some of us are here because we're not all there!

I went with platinum and targeting/guessing at 50% based on KnC recommendations.
I expect the PS's will far outlive the miners so it is not a waste.
I also went with twice as many Saturns instead of Hoopiters.
It is more expensive but more flexible IMneverHO.
I'll have room and power for gen2 modules if they materialize.
Plus they will run cooler. I might adjust the 4 module ductage if it is installed in 2 module units.

As mentioned above, ppl with UPS's surf through 'the beginning' of outages.
Luckily I have spare 1500VA's with new battery, prolly good for 5-10 minutes. lol

Don't forget about air filters!
I use furnace filter material for my PC's.
Huge filter so it can get a bit dirty and still have good airflow.
Clean is cooler

I'm thinking of making a duct for 20" box fans instead of the case fans.
A 20x20 furnace filter fits nicely on the input side.
My goal is huge air and lower noise with easy to replace inexpensive filters.
This will also remove a few watts from the rigs.
I point one at my PC's when I don't want to run the AC.
I also have my equipment on 2'x4' shelving with acoustic ceiling tiles under and around the equipment.
(tape or paint the edges else they are a major source of lint/dustage)
This helps lower vibration and noise.

My decorating motif is 'industrial', lol

Some people pimp their rigs with lighted fans, etc., not me!
Everything has too many useless LED's nowadays, fuck that noise.



Soon!

This year, but next year the half day of non-mining will cost almost nothing 

LEPA G1600-MA is the one you want to buy. It's cheaper than most and it has a peakpower of 1700W.
With 1 Jupiter it will run at around 40% max. power; OC it will still be around 50%. And you can power a second Saturn or another Jupiter depending on the final power consumption and still be very efficient. If it fails - well, I would imagine the local computer store near you will be happy to sell you a new one in a matter of minutes.

I wouldn't run the two on one PSU, good call there.

Get whatever you feel safest with. Don't cut corners. Solid PSU's can be re-sold, or re-used at a later date. Killing your unit by cutting corners will only mean you may loose out in the long run.

Also is you are running one PSU for both, and the PSU fails, that's both units out of action till the situation is resolved.

September 8th, is that all? Man, October can't come quick enough!

yes, technically you can. but as you mentioned, it is definitely safer to buy new PSUs for each miner. just because, half day of non-mining because of faulty PSU will cost much then new PSU.) I will buy something from enermax, at least with gold certification but considering platinum now.)