Quiet Antminer S15?

[Pepe Lapiu]

dude  do not touch  the stock fans

Why not? If I can get just as much, and maybe even more airflow with my squirrel fan, why not?

build a box.

I like your set up. So I am likely going to build something similar. I'll see if I need both the soundproof box and the fan replacement, or just one of the two.

I also think that grill on the exhaust side of the S15 is a complete waste. If you have no critters crawling around your farm, I don't see why those grills shouldn't be removed, or even replaced with exhaust fans.

I think 4 fans spinning at 4000 rpm would move more air than just the 2 fans at 6000 rpm.

Thanx for the video. Now I'm 100% confident I can make the set up a lot less noisy.

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[philipma1957]

it will be quite quiet with  a good box so pulling the small psu fans is not needed.  (at least until you can order a spare psu)  the psu is a specialty psu and spares are not searchable to get one. .

pulling the grill and adding an exhaust set of fans could be good idea.  also braiins os for the s15  will come soon which will allow for more fan control

braiins thread is here

https://bitcointalk.org/index.php?topic=5036844.0

[Pepe Lapiu]

Yup, hardware cooling is where I have some experience. As I stated earlier, rated CFM for fans is in open air with absolutely no restrictions. Once you add restrictions, you get a completely different actual CFM. Elbows in ducts, too narrow a duct, grills, filters...all contribute to slowing down the air flow. I think removing the grills on the exhaust side will not only help airflow, it will reduce noise a little bit as well.

[Artemis3]

Yup, hardware cooling is where I have some experience. As I stated earlier, rated CFM for fans is in open air with absolutely no restrictions. Once you add restrictions, you get a completely different actual CFM. Elbows in ducts, too narrow a duct, grills, filters...all contribute to slowing down the air flow. I think removing the grills on the exhaust side will not only help airflow, it will reduce noise a little bit as well.

I'm very interested to see the results of your proposed modification, a quiet S15 could be very useful...
I agree that the grill is in the way, and its probably another source of noise.

If Braiins OS gets ported to it, a low power configuration would be very interesting to see, max efficiency usually also leads to quietness, when paired with underclocking.

[Pepe Lapiu]

I'm very interested to see the results of your proposed modification, a quiet S15 could be very useful...
I agree that the grill is in the way, and its probably another source of noise.

If Braiins OS gets ported to it, a low power configuration would be very interesting to see, max efficiency usually also leads to quietness, when paired with underclocking.

Well, I'm coming up with a few more ideas to make it more quiet.

For instance if you replace the exhaust grill for a couple of fans you could probably get more air flow with 4 fans turning at 3000 or 4000 RPM instead of the two turning at 6000 RPM. And that alone would really help quiet down the rig. 3000 RPM fans are a bit noisy but far more pleasant than anything at 6000 RPM.

But maybe just a sound proof box will do. For now it's just speculations as I haven't got the rig yet.

And I'm not sure I'm going to need that software. Faking a fan RPM signal is pretty easy.

[HagssFIN]

The psu high pitch noise cooling fans are the biggest issue with the S15.

[mikeywith]

And the machine would have to be in my bedroom.

not to let you down, but anything aside from liquid cooling will not be quite enough to be placed right next to your pillow, we all have different sleeping abilities indeed, but for the average person, that's quite hard, i have been there, done that, never worked.

the box that phill suggest is a great idea, i used a slightly similar one before with a D3  "back in the glorious days", i made out of wood and tons of waterproof foam, i even used 2 ducts to further reduce the fan noise, the noise was reduced by a good amount, but never really quite enough for my wife not to nag all morning next day  . but as soon as i went out the room, the noise is totally gone. so if you got a spare room that will work, if not ! , good luck.

[Pepe Lapiu]

The psu high pitch noise cooling fans are the biggest issue with the S15.

From where I stand and without an actual machine I  front of me, there are two ways I can think of reducing the noise of the PSU fans.

1) Remove the grill on the exhaust side and add two exhaust fans. I'll put a fan speed controller on all of the PSU fans to determine how much slower I can get them to pull as much air as the two faster stock ones. If I can get them 2-3000 RPM slower, that should make a big difference.

2) Replace the two 50mm fans with a single 120 mm one on a shroud. Or maybe block the holes on the two small fans and install a 120 mm fan on the side of the case. Not sure about that  I don't know how the PSU is configured inside. That one might not be possible.

[Artemis3]

From where I stand and without an actual machine I  front of me, there are two ways I can think of reducing the noise of the PSU fans.

1) Remove the grill on the exhaust side and add two exhaust fans. I'll put a fan speed controller on all of the PSU fans to determine how much slower I can get them to pull as much air as the two faster stock ones. If I can get them 2-3000 RPM slower, that should make a big difference.

2) Replace the two 50mm fans with a single 120 mm one on a shroud. Or maybe block the holes on the two small fans and install a 120 mm fan on the side of the case. Not sure about that  I don't know how the PSU is configured inside. That one might not be possible.

I don't know if that PSU is monitoring the fans and needs to read rpm values, that would make things a bit trickier if you remove them, tho in principle i would agree. Bigger fans always moves more air making less noise at the same rpm.

I don't understand the "block the holes" part, that would be like removing them but leaving obstructions to the air flow.

You will want to run it in "enhanced low power mode" or if Braiins OS gets ported, underclock it.

[Pepe Lapiu]

I don't know if that PSU is monitoring the fans and needs to read rpm values, that would make things a bit trickier if you remove them...

That's been addressed already. There is a software that would allow me to bypass the fan control system. I could also fake the RPM signal. Or even easier, leave a fast turning fan with the fins plucked out strictly to report RPM.

Bigger fans always moves more air making less noise at the same rpm.

Without testing, I am willing to bet a single 120 mm Gentle Typhoon fan spinning at 2150 RPM would push more air than the two small ones.

I don't understand the "block the holes" part, that would be like removing them but leaving obstructions to the air flow.

That idea might or might not work depending on how the PSU is configured.  What I am talking about is removing the two small fans and blocking that hole with tape. Than I would install a 120 mm or 140 mm fan on the side of the PSU, not on the front where the two fans are. To do this, I would have to drill holes on the side panel of the PSU. But again, I would have to see the inside of the PSU to know if this can work. It would be dumb to install a fan on the side of the PSU box that blows air onto the back of a board, basically cooling nothing at all.

You will want to run it in "enhanced low power mode" or if Braiins OS gets ported, underclock it.

I don't think you get it. I am proposing to double the number of fans at slower speed, which would result in the same air flow. And I would also remove the front grill for better air flow.

In my years water cooling we did all sorts of tests to find out what works best. Often times we found out that two fans on a radiator, one pushing, and one pulling, will yield better results at 1000 rpm than a single fan pushing at 2000 rpm.

So if that applies here, I should be able to double the number of fans while greatly slowing the RPM for either same or better air flow.

And other way to get better performance with less RPM is to use thicker fans. Bitmain got it right when they decided to use 38mm thick fans instead of the standard 25mm ones. A 38mm thick fan will push more air than a 25mm one at the same RPM.

[Artemis3]

That's been addressed already. There is a software that would allow me to bypass the fan control system. I could also fake the RPM signal. Or even easier, leave a fast turning fan with the fins plucked out strictly to report RPM.

Not the Asic fans, the PSU fans, if they are monitored/controlled its inside the PSU itself...

That idea might or might not work depending on how the PSU is configured.  What I am talking about is removing the two small fans and blocking that hole with tape. Than I would install a 120 mm or 140 mm fan on the side of the PSU, not on the front where the two fans are. To do this, I would have to drill holes on the side panel of the PSU. But again, I would have to see the inside of the PSU to know if this can work. It would be dumb to install a fan on the side of the PSU box that blows air onto the back of a board, basically cooling nothing at all.

Its right here: Cybtc Review: Bitmain Antminer S15-28TH/s



It also looks like you can unscrew the grills: