Thanks for the replies.
Just to clarify, my idea of quiet is basically completely silent
![:D :D]()
All the fans I have right now, except for the PSU, are 140mm NoiseBlocker XL2 running at max 800 RPM. Combined they are audible but it's more like light wind than the typical fan noise. The PSU however totally ruins the silence.
I've seen the recommendations at silentpcreview.com and they are all for less powerful PSUs than what I need. I have measured my system use a maximum of 1050W when under heavy load so I need a PSU which can deliver that. My current unit rated at 1.1kW is an absolute minimum and I'd be happier with something a bit more powerful just to be on the safe side.
Since there is no PSU available that has both a rating of 1.2+ kW and a maximum fan speed of 800 RPM I was looking for alternative solutions. A few less powerful, fanless PSUs would be an option so I will definitely look into the 500W Silverstone model (thanks o1die). The problem is that I would need 3 of them and I can't fit all three in the case. So I will need to put them outside the case. As hunter315 mentioned though these PSU need some air flow to work as expected so that means I would need to design a special case just for the PSUs and some fans to cool them. That's I guess an option but a bit too much effort right now
What about some other, non-traditional solutions? Perhaps an external PSU or something else?