Build a Ryzen 5 1600x based system in a sound-damping case with FDB fans that have silicone pads and rubber screws to mount to the case with. Cougar > Noctua Even when the fans are at 100% it's still relatively quiet, and the ASUS GPU I got can slave PWM fans to it so that they only spin up when they are needed. The GPU fans themselves stay off when passive cooling is adequate, so they are all currently off, one of the the intake FDB fans that's slaved to it is only running at 40% speed, and in a dead silent blacked-out room with windows that are closed and covered with sound damping foam and blackout curtains in front of that, the computer is STILL quiet.
I think I may actually slave both of my intakes and exhaust fan to the GPU because it works so well. Sucks my cable management was already done, but I think it would be worth it. I'm concerned that the 12CM exhaust fan isn't able to move enough of the air out that the two 14CM fans bring in. I want positive air pressure to help prevent dust, but I might have too much.
Either way, it is top comf for emulation and browsetry.