Hello again bowzee !
My power supply is a Seventeam ST-550P-AG
Alas I know nothing about this PSU.
which has an automatic rotation control of some sort
To know exactly what noise we are talking about is there any way to measure the fan RPM ? usually there is a two / three pins connector to be plugged to the motherboard to report PSU fan RPM. Do you know this value. We would determine exactly if the actual rotation is bothering you or the woosh or even if the control circuitry is defective.
The noise that I hear coming from it sounds like a hum
Depending on what I do with the other fans from SpeedFan's window the frequency of the hum changes
If it is a low frequency maybe the fan is transmitting vibration to the PSU and case. Have you tried using grommets / soft fan mounts ? And how close exactly are the other fans ? Maybe two of them are too close together and generate turbulence ? Should not, but who knows ?
I appreciate your suggestion about getting a power supply that has been reviewed by SPCR. Unfortunately I can't get any of them here where I live.
I guess most companies do not deliver underwater unfortunately
When you say that I should swap the Thermaltake fan for another one, which one would that be? I am not sure if you noticed but that is exactly what I was trying to do and this is almost the title of my post. The original fan was 80 cfm, meaning that using a "silent fan" here would probably blow up the power supply.
It really depends on how far you are ready to go to experiment. I repeat that any fan that blows 80CFM will not ever be silent. If you want to use 80CFM fan, any ball-bearing fan will do as the woosh will cover any kind of non-defective bearing noise, especially in an enclosed PSU prone to turbulence. If you don't trust me, feel free to browse around the forum for other opinions but be prepared to be dissapointed with any 80CFM fan noise-wise. If you want to tinker a bit, you can try other slower fans or even couple two fans of you are ready to go the DIY route.
I disagree from you when you say that analyzing 80 cfm fans is contrary to the point being made at SPCR, I find this quite dogmatic
You have a right to disagree. And I like the bold emphasis. But it is more a matter of physics. This forum is dedicated to silent computing so if you want reviews on 80CFM fans, SPCR is not the right place to ask simply because they are NOT and will not ever be "silent".
Seraphyn pointed to other forums which are more suitable if you want 80CFM fan reviews. But as i said, browse around the forum and see if most trusted posters believe a 80CFM fan can be quiet. Or you can choose to trust thermaltake again and buy their wind turbines.
For reference, most people making fan swaps on this forum use quiet fans like the Scythe S-Flex fans at 1200 or 1600RPM or lately even Scythe Slipstreams. None of those are likely to go over 60CFM. Whether those will do the trick for you is up to your case airflow, the layout and heatsink size in your PSU......
If you really want a beefier fan, then there already are a lot of threads even on this forum on higher speeds fans you could seek out. But no one will pretend they are silent or even quiet.
The same applies to the statement "the air woosh will always cover the motor and bearing noise". I really do not trust my ears for this task and as per the Thermaltake fan that I just purchased this seems to be false. But again, I really do not trust my ears for this task.
If your bearing noise is so high it covers a 80CFM woosh then your bearing is defective and the entire fan should be replaced. And remember the Thermaltake fan uses a sleeve bearing and those do not take kindly being put in the vertical orientation. They will wear out quickly and most of the time generate more noise.
Also regarding what you are calling lies being told by the manufacturers, I also find this dogmatic.
Until I get a figure measured by some reputable person/entity, as SPCR for example, I have no other way to know this.
Dogmatic ? No i would call that marketing. No company will ever sell fans pointing how noisy they are. It's all a matter of the methodology used for measurements but few companies will not even bother giving you this information. And some companies earned trust from people here using ratings not so far from the truth. Thermaltake is not one of them. Search this forum using their name and see how much they are loved here.
Happy browsing and tinkering !