Change the fan to Delta AFB1212SHE (I think). Single fan will be fine. You will need to change the firmware. Braiins OS works fine. You will need Braiins OS+ to be able to set a power usage figure. I have mine set to 775w now and it gets 10Th. Change the psu to whatever psu you like aslong as it has the right amount of PCIE cables. Personally the HP common slot supplies with appropriate breakout board abs cables works well.
I have got to ask, is Delta AFB1212SHE the fan fan for silencing an S9?
Just tried two Artic P12, it was a complete fail.
The default Nidec Ultraflo fans are utter Sh*t for this purpose, at 25% they are way noisy.
I have one S9 with an unbranded SHLF1212AHE-01, that i set to 45%, temperature performance is the same as Nidec and its much, much quieter.
Whats experiences you guys have with silent fans for S9?