Attached are the BIOS settings for my fans. I never keep any fans running at the same speed; this can set up a resonance that can make fans noise louder. Even when I have multiple fans on the front (and often even on radiators), I set each one 50 to 100 rpm apart from the others. This is why CPU1 fan ≠ SysFan1 ≠ SysFan2.
Overall, the fans are very quiet in their case (a Thermaltake View 71). It's a big case. I placed the CPU radiator on the top. I drilled some extra holes and mounted 3-140mm fans in the front (stock was 2).
I still have yet to convert the 2 Radeon VIIs to water cooling That will require at least one more fan header. I presently have 5 free headers.
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First image is the CPU fans (the 3 fans on the radiator).
The next image is the pump settings.
Next, is the TRX40 chipset fan (inside shroud):
Finally, the case fans (there are presently 2 sets: 3-140mm intake fans at front and 1-140mm exhaust fan at rear):