Hi, I’ll share my solution, which is
- Externally mounted Noctua 40x20 fan. At 30% pwm @ 2k rpm it’s nearly inaudible with your ear next to it. I stuck it to the PSU exhaust grill with tape for sealing and wire for rigidity. It’s connected to the extra Chasis FAN header and setup to be always on at min 30% in EFI (bios). The power connector is currently run externally via open top.
- Removal of the terribly restrictive pipe from the PSU inlet. This required the temporary removal of the MB and some swearing when dealing with the wire jungle. Air is mainly supplied by uncovered holes in the bottom row of Tiles, which is left bare, though you probably only need to remove the bottom middle one.
With this there is no annoying PSU fan sound at idle and the PSU is not getting cooked, which is a plus for it’s longevity.
An improvement might be a 3d printed bracket for a 60mm fan mounted via the PSU screw holes.