lol that sounds like a fan running at 100%, Faulty unit, I have identfied this fault with Enhance, agreed on the reason/cause, and steps have been taken to avoid it in future production runs. Am hoping someone pops up with this fault so we can confirm its identical and show how to fix it.
With a properly working PSU It goes like this, 0 to 480W, silent with noctua, a bit of acoustic with stock fan , due to dual ball bearing compared to fluid bearing. Vout to fan in this range will sit at 3Vdc. If there is a fault fan can run at lol
Problem is my variable loads make a shit load of noise and then with them off, the buildings HVAC gives more background noise. So my trying to do a noise test is a bit fruitless.