How noisey is your PSU? Thought of getting a passively cooled PSU? For example
I would, but the PSU is one of the two only fans in the system, so in this case I need the PSU fan to dissipate the ~25w of PSU conversion loss as well as the lion’s share of the ~50w that the rest of the system is using.
The PSU is the loudest part of the system, but that’s relative-- it’s still a very quiet 80mm fan at lowish RPMs. I thermistor modified the PSU, eg, I moved the thermistor away from the heatsink it was mounted on so the fan almost never ramps based on temp.
Going to an external power brick is an option for lower voltage systems but I don’t think I’m quite at that lowest of levels yet.