Two s9js with different noises (solved)

[Betqueen]

I purchased an Antminer S9j arround 3 months ago and what I love about this miner is, it doesn't seem to be noisy at all. I checked the status and the Fan3 is 3700 R and Fan6 2500 R. the label on the fan says SUNON (from China) with a red and white semi-spheres

But I purchased another S9j yesterday and unfortunately it's a lot noisier. both fan speeds are on 4000 R. the fan company is Yate Loon Electrocnics (from Taiwan) with a yellow label

why is there miners with different noises ? is it the number of fan blades or it might have something to do with firmware or RPM ?!!

[mikeywith]

I purchased an Antminer S9j arround 3 months ago and what I love about this miner is, it doesn't seem to be noisy at all. I checked the status and the Fan3 is 3700 R and Fan6 2500 R. the label on the fan says SUNON (from China) with a red and white semi-spheres

But I purchased another S9j yesterday and unfortunately it's a lot noisier. both fan speeds are on 4000 R. the fan company is Yate Loon Electrocnics (from Taiwan) with a yellow label

why is there miners with different noises ? is it the number of fan blades or it might have something to do with firmware or RPM ?!!

i am interested in seeing temps on both, and whether they both run at the same exact hashrate and environment or not, noise has everything to do with RPM and a little to nothing to do with fan type, despite the fact that there are indeed some lousy fans that make a sort of whistling sound but i think that's not the issue for you.

i think your new miners runs at cooler temps because the fans spin faster , you see 4000 RPM is gotta be noisy regardless of who fan that is.

so that you can do is put it on static speed till it fits the noise level you looking for, but also keep temps in check.

make sure you use the latest firmware, it uses less power therefore, some less heat.

[Betqueen]

I couldn't have it on for a long time to make a clear analysis but after a 10 minute test I noticed that it's cooler than the first one around 64-67 but the first one is around 73-76 (in the same environment ). hashrates seemed to be the same.

Here is a short audio for a better analysis :
https://www.mediafire.com/file/m52wbv47alg24vo

how can I put it on a static speed ? (it seems like it's already set on a static speed cause it can't seem to change with different hashrates).

And also here is a way to reduce the fan speed using PuTTY but I'm not sure if it's a good idea :
https://www.youtube.com/watch?v=D3U_YPuN77g

[mikeywith]

that will work, but this is easier > https://bitcointalk.org/index.php?topic=2690140.0

i assume your problem will be solved when you set the to fixed speed, you got 10 degrees difference, that's due to the higher rpm on the newer miner, the old miner temp's are fine too, tho i cooler the better, but since noise is an issue, just go ahead and reduce those rpms to something similar as the old one and they will both have almost the exact same noise level.

[Artemis3]

Easy test: Swap the fans between the miners. Then you can tell for sure if the problem is simply the fan brand/model. And yes different fans have different performance, i wouldn't be surprised that is actually the case.

When doing this make sure to respect which fan goes front and which one goes back, as one is stronger than the other.

After you perform this test you can then decide if you want to buy the exact fans online.

I wouldn't bother with "forcing" rpms much, the speed should be in relation to temperature. Of course that doesn't mean all Bitmain controllers do this perfectly well.

[fanatic26_]

If you have an s9 you think is 'quiet' you somehow managed to get a unicorn. The noisier machine is more in line with a normal s9.

They are industrial equipment, they are not meant to run in a quiet mode, and you should not expect them to. They were designed for industrial environments where sound levels are basically meaningless

[Artemis3]

There are however methods to quiet them, such as putting it inside a wooden box with ample holes on the sides covered inside with sound insulation fabric.



And with the addition of Braiins OS, you could underclock them to maximize efficiency and have then run quieter, as philipma1957 demonstrated, an S9 can work at say, 500mhz 8.0~8.1v producing 10TH/s while pulling a mere 823 watts, lowering the traditional 100w per tera down to 80 watt per tera, AND lowering the temperatures enough to have the fans work at 3k rpms or so automatically as opposed to 5k~6k rpms.

[philipma1957]

With the cheaper prices for s9j or s9i if you run braiins at lowest settings the s9 can have fan speed at 2000 to 2500 .  A guy like fanatic_26. Could take the best boards for underclock and sell specialty braiins s9

if he was so inclined to do so.  he could probably get a premium .  The s9i's I did  would do 8.0 8.0 8.1  and the other would do 8.1 8.1 8.0  for the lowest clocks. Fanatic_26 has a lot of s9's to cull the best underclock boards.

[somename]

I'm sorry to hijack this tread, but can someone share lowest possible settings for S9 with Brains? One of my miner is able to run 500MHz@7.9 (10.5TH) with 880W consumption at ~240V. Others do 500MHz@8-8.2V with 930W+.  I guess you can go lower with frequency, but as far as I know 7.9 is lowest possible voltage for S9.

[philipma1957]

I'm sorry to hijack this tread, but can someone share lowest possible settings for S9 with Brains? One of my miner is able to run 500MHz@7.9 (10.5TH) with 880W consumption at ~240V. Others do 500MHz@8-8.2V with 930W+.  I guess you can go lower with frequency, but as far as I know 7.9 is lowest possible voltage for S9.

you could get  all 7.9  which is best

then play with MHZ

you may find a

7.9 > 475
7.9 > 475
7.9 > 475  gives you the best watts efficiency

I have no access to the braiins I set up until tues.
and my 815-823 watts numbers were gotten using a corsair 1500 watt titanium psu
I know that would be okay for a small miner if he got a good deal on the corsair

IIRC  I did 815 watts and 10050gh  and fans were close to  2500 rpm

In the current location  it is doing

   s9brains   9.089T   9.549T   9.690T   0.10%   2019-03-03 04:25

9.69th at the pool

the dips are reflections of power on and up during setups of other miners and fans etc.

[somename]

So if I understand it correctly, best efficiency(W/TH) is mainly based on voltage, right? Therefore I should try to run them all on 7.9 and tune the frequency?

[Artemis3]

So if I understand it correctly, best efficiency(W/TH) is mainly based on voltage, right? Therefore I should try to run them all on 7.9 and tune the frequency?

From what i understand, after you lower the voltage, you lower the speed until the asic board starts hashing properly again. This is a bit of a trial and error and needs lots of reboots, and each board (chain) seems to like different settings. Its the opposite of overclocking, where you set a high speed then increase the voltage until it hashes again, and hopefully don't get too many HW errors (or melt your chips).

[mikeywith]

Why does everyone seem to ignore that OP has stated the fact that he already has an S9 with fans running at "3700 and 2500 rpm"  which he seems to be happy about ? but the new one is apparently quite louder and runs at  4000 RPM ?

it's very obvious that they both have a different firmware , different firmware target different temp, therefore different RPM when put in the same environment.

the only options he has are these

1- flush the loud miner with the same firmware from the quite miner.
2- set a fixed RPM on the loud miner.

[Betqueen]

@mikeywith I can't thank you enough. I tried the option 2 and now both run with the same speed and not noisy at all (however I still hear a muffled whistling sound on the new one). I had to set the RPM to 30% in order to get to the same speed on the old S9J !!!

It definitely has something to do with the firmware cause when I set the fixed RPM on the old one (with the same speed of course) it had to be 60% which is more logical.

Now the question is, is there any way to modify the firmware files to get to a desired speed without setting a fixed RPM or losing the auto-tune feature ?

I only see a few files in the compressed .tar file... like bmminer.conf, dropbear ..... so on and so forth and none of them include any specific info regarding the fan speed or auto-tune.

[mikeywith]

@mikeywith I can't thank you enough. I tried the option 2 and now both run with the same speed and not noisy at all (however I still hear a muffled whistling sound on the new one). I had to set the RPM to 30% in order to get to the same speed on the old S9J !!!

the whistling sound has to do with the fan brand/type, if you want to get rid of it, you need to find the exact fan on your 1st miner and install it on the second miner, the whistling sound seems appear at certain RPMs , so you can alter the RPM slowly till it "might" just disappear.

Now the question is, is there any way to modify the firmware files to get to a desired speed without setting a fixed RPM or losing the auto-tune feature ?

there must be away, there is a temp to rpm equation/code and it's different from a firmware to another, notice that i have never attempted looking it , but the logic states that it has to be there, but i doubt it's an easy job to do, an alternative option would be using something like awesome miner, you can have it change the miner frequency/rpm when the temp get to x degrees.

tho i don't think that's important, as long as your temps are good you can just keep the fixed rpm , it will be saved even after power disconnect, so you only need to do it once , if they get hot, you can reduce the frequency , and most importantly make sure you enable the temp safety by doing this

1- while on your miner setting tab, right click and hit "Inspect"

2- Type the word (display) in the search box

you will get this.



whenever you find (:none) just delete it and hit enter , you will unlock a few good stuff, including frequency,temp protection, fan control etc.

[Betqueen]

tho i don't think that's important, as long as your temps are good you can just keep the fixed rpm , it will be saved even after power disconnect, so you only need to do it once , if they get hot, you can reduce the frequency , and most importantly make sure you enable the temp safety by doing this

That's exactly what I'm going to do. thanks again