vagfilm Oops that is some time ago and the names/numbers are probably somewhere deep inside the PCs now.
I do remember buying three, of different power ratings as needed in the different machines, and they weren't from the cheapest/budget line. Maybe on really hot days, you hear a whisper, but on normal days and use, I don't hear anything, certainly at normal working distance from the PCs (tower cases which are right next to my desk on a stand).
The same goes for the fans. I use three 120mm Silent Wings 2 fans per case, together they move enough air so rpm per fan can stay low unless the wheather gets hot. All connected to automatic rpm controllers on the motherboards.
For the processor coolers I bought 90-degree angled ones from Noctua. I took off the included Noctua fans and installed Silent Wings 2's on the coolers as well. Also automatically regulated from the processor cooler header on the motherboard.
Wait -- wasn't this a Piano forum? 🤭
Cheers and happy silent operations,