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Amiga 4000 desktop power supply unit (PSU) fan
In case anyone ever needs to know - and this is written a bit repetitively for searchability later, if someone finds it via web searches later you're welcome:
The stock Amiga A4000 desktop power supply (PSU) 12V (12 volt) fan runs at 3000 RPM ( 3000RPM ) by my measurement, moving 20-30 CFM (cubic feet per minute) of air according to what little data I can find online.
(Obviously, that's an outside-of-PSU measurement, as case affects airflow.)
It is a standard 80mm fan by measurement and can be replaced with a Noctua NF-A8 FLX 3-pin fan running on the low-noise but not lowest-noise cable, which gets you just under 25 CFM - at least in the current (2021) iteration of that fan's lineup.
This does not make the PSU run silent but does make it run a lot more quietly.
The stock Amiga A4000 desktop power supply (PSU) 12V (12 volt) fan runs at 3000 RPM ( 3000RPM ) by my measurement, moving 20-30 CFM (cubic feet per minute) of air according to what little data I can find online.
(Obviously, that's an outside-of-PSU measurement, as case affects airflow.)
It is a standard 80mm fan by measurement and can be replaced with a Noctua NF-A8 FLX 3-pin fan running on the low-noise but not lowest-noise cable, which gets you just under 25 CFM - at least in the current (2021) iteration of that fan's lineup.
This does not make the PSU run silent but does make it run a lot more quietly.