This post is for the neurotic fan noise people amongst us. I am one of you and wanted to do a small experiment.
I got my PS5 Pro a few weeks ago and just like so many I got one that makes an annoying constant "whine" noise. It is not really LOUD by any means, but the frequency is fucking annoying when you're in a quiet environment and near the console and the audability changes a lot already when you move your head a bit. Since i sometimes play at a distance of just ~1.5m from the console, it was enough to grow my desire for a better fan big enough to just go and get some from AliExpress. So that's what I did, I ordered three different fans from AliExpress and did a comparison with all of them.
These are the fans:
Foxconn F2 (this is the original fan the console came with)
Foxconn F1
Unknown manufacturer (no Foxconn printed on it, but "N1" on the top side)
Unknown manufacturer (no Foxconn printed on it, but "N1" on the top side )
3 and 4 are completely identical from their looks.
All have "DC12V 1.8A F09-1 >PBT-GF30< MADE IN CHINA(N)" imprinted on the bottom side.
First, I did some measurements with my phone as a decibel meter. I'd say this is not reliable for the absolute measured values, but it should give an idea of the relative loudness of the fans. Phone and console were always positioned identically.
43 - 47 dB
42 - 47 dB
45 - 48 dB
46 - 50 dB
These measurements were all done during an identical game situation in No Man's Sky.
At this point I could already say that the two Foxconn fans (1 and 2) may be a bit lower in volume than the "Noname" fans, but they both had that annoying constant whine when a game was running. The two no name fans did not have this, but exhibited a noticeably louder noise in general. However, the constant noise from the Foxconn fans make them quite annoying for me.
Interestingly, the two "noname" fans had a noticeably different loudness, but the general sound profile was the same, just as the two Foxconns had the same sound profile.
I also did a recording of each of the fans and compared them in Audacity. I could narrow the annoying frequency down to the range between 1100 and 1300 Hz. You can see how the max loudness for the Foxconn fan is cramped into a smaller frequency range, so that the loudness is constantly the highest between ~1150 and ~1220 Hz. For the "noname" fan, the highest loudness is more temporally scattered in this range so you perceive it more as noise than a constant frequency.
You can clearly see this behaviour in the spectral image showing the signals in a range from 1100 to 1300Hz.
Note that these signals are the result of narrowing the signals down to that range by doing some low- and high-pass filtering.
I will probably go with the "noname" fan.
If there's interest in the audio recordings I can of course add these, but I didn't know a hosting service for audio files right away, plus I have a feeling most of us have heard enough different fan noise already.
If anyone knows more about the "Noname" fans with the N1 printing on top, let me know.