PSU airflow problem

[SolHarvester]

The PSU I have is a 'Chain Force Cannon LL2000MINI' and it's not working how I expected it. To explain what I'm trying to do, I have the PSU connected to an Antminer S9 SE.

I took the fans off the S9, I have to wait for the fanspoofers to come in so I can install them.
I'm using a duct fan inside a custom made enclosure to force air through all the components intakes and trying to block hot air from returning to the intake side.

From what I understand, the intake for the S9 is on the Ethernet side, a big problem is when I powered on the PSU beside the S9, the fans of the PSU was pushing air out to the Ethernet side. That was not what I was expecting or want and throws a wrench in my design. I'm guessing that's how the fans on PSU is supposed to be?

I'm looking for what to do. I thought of flipping the PSU around, or open up the PSU to reverse the fans themselves, or just take the fans out completely, but I heard you shouldn't take them out and I figure could damage the PSU.

So it makes me wonder about those 3D printed manifolds that people buy for their miners that include the PSU  in the shroud. Do you just deal with air being pushed against the cool air coming in?

The other major problem with the PSU fans is they're really loud. I thought maybe they start out at full rpms, but then slow down after things fully boot and quite down, or do they stay at full rpms?

I looked at other PSUs to see if there are quieter ones, but I think I might run in to the same problem with airflow. I feel like I've taken on a (costly) project I shouldn't have started. I'm pretty frustrated and don't know what to do.

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[philipma1957]

it is a shit choice for the psu if sound was important.

if you want to stay with it reverse the air flow in the s9.

the s9 does not really give a fuck which way the air flows.

Here is a hint find a firmware that will down clock the s9 to reasonable power pull

you can get 10th and 820 watts with correct firmware. (braiins+) and others will do the gear at a good down clock.

good luck .  by the way they are many build threads on quiet s9's

[SolHarvester]

it is a shit choice for the psu if sound was important.

if you want to stay with it reverse the air flow in the s9.

the s9 does not really give a fuck which way the air flows.

Here is a hint find a firmware that will down clock the s9 to reasonable power pull

you can get 10th and 820 watts with correct firmware. (braiins+) and others will do the gear at a good down clock.

good luck .  by the way they are many build threads on quiet s9's

Oh damn, okay.

Yeah I guess I could just turn the whole thing around. That would be easy.
Though I would love a bitmain PSU, I've seen them rated at, 40-50dB, which would be way better. I need to pull out my SPL meter and measure the dB of this PSU. I'm pretty sure it's way louder than 50dB. But I need to make a choice on something to make it quieter. I got to cap off my budget for this this cause the spending for this project is getting out of control.

So either a new PSU, or keep the old one and add more soundproofing.
What my plan was for that is to pull everything back out of the enclosure, seal up every air gap with green glue, put mass loaded vinyl down on all sides, inside the box. Then put the acoustic foam back in. The old PSU will have to be isolated on the hot side including it's exhaust, which I think wouldn't matter anyways.

Another thing I could try it just buy a new PSU, put it in the box and see what noise I get. If it's still too loud then return it. So I have a few things to consider and try.
Thanks for the help.

p.s.
I measured it and it's 79dB. The inline fan is 60dB at full power. Everything running is 51dB with the box closed. Which is not bad, but still sounds like a neighbor with a vacuum cleaner.
I went ahead and just ordered a Bitmain PSW7. Says it runs about 46dB. We'll see.

[philipma1957]

it is a shit choice for the psu if sound was important.

if you want to stay with it reverse the air flow in the s9.

the s9 does not really give a fuck which way the air flows.

Here is a hint find a firmware that will down clock the s9 to reasonable power pull

you can get 10th and 820 watts with correct firmware. (braiins+) and others will do the gear at a good down clock.

good luck .  by the way they are many build threads on quiet s9's

Oh damn, okay.

Yeah I guess I could just turn the whole thing around. That would be easy.
Though I would love a bitmain PSU, I've seen them rated at, 40-50dB, which would be way better. I need to pull out my SPL meter and measure the dB of this PSU. I'm pretty sure it's way louder than 50dB. But I need to make a choice on something to make it quieter. I got to cap off my budget for this this cause the spending for this project is getting out of control.

So either a new PSU, or keep the old one and add more soundproofing.
What my plan was for that is to pull everything back out of the enclosure, seal up every air gap with green glue, put mass loaded vinyl down on all sides, inside the box. Then put the acoustic foam back in. The old PSU will have to be isolated on the hot side including it's exhaust, which I think wouldn't matter anyways.

Another thing I could try it just buy a new PSU, put it in the box and see what noise I get. If it's still too loud then return it. So I have a few things to consider and try.
Thanks for the help.

p.s.
I measured it and it's 79dB. The inline fan is 60dB at full power. Everything running is 51dB with the box closed. Which is not bad, but still sounds like a neighbor with a vacuum cleaner.
I went ahead and just ordered a Bitmain PSW7. Says it runs about 46dB. We'll see.

remember show some photos bro:

you can use

talkimg.com it is free

[mikeywith]

I went ahead and just ordered a Bitmain PSW7. Says it runs about 46dB. We'll see.

Why oh why, that S9 SE is worthless, and so will be the PSU, you should have invested a little bit more and got a good PC PSU like EVGA, those run a lot quite and could be useful later on.

But ya, anyway, the 6pin wires on that APW7 are long enough and you would probably be able to reverse the PSU, these PSUs are designed in a way that if you put them too close against the wall they would still be able to suck air in from that little gap, as opposed of pulling air from the other direction where the hot air would be trapped near the wall and kaboom.

[SolHarvester]

remember show some photos bro:

you can use

talkimg.com it is free

I decided to take it out of the box I was trying to make for it. The miner did not like it. I now have it in the original enclosure, which was meant to dampen the sound. I reinstalled the fans and I also have an inline fan blowing across the entire enclosure. It seems to be working to keeping the hot air from returning to the intake and that side stays cool.

Enclosure intake:
https://talkimg.com/images/2023/12/31/IOoCf.jpeg
Enclosure exhaust:
https://talkimg.com/images/2023/12/31/IOcOD.jpeg

The APW7 does have the fan side pulling air in, which is perfect so I don't have to flip the unit around.
I just got around to accessing the miners OS and there seems to be problems. I decided to make a new post about it.

[philipma1957]

remember show some photos bro:

you can use

talkimg.com it is free

I decided to take it out of the box I was trying to make for it. The miner did not like it. I now have it in the original enclosure, which was meant to dampen the sound. I reinstalled the fans and I also have an inline fan blowing across the entire enclosure. It seems to be working to keeping the hot air from returning to the intake and that side stays cool.

Enclosure intake:

Enclosure exhaust:


The APW7 does have the fan side pulling air in, which is perfect so I don't have to flip the unit around.
I just got around to accessing the miners OS and there seems to be problems. I decided to make a new post about it.

looks nice good work. gave you some merits