So, I have like five of these PSUs bought about 10 or so years ago. They all work fine.  However, these PSUs are the loudest component in all of our gaming PCs/desktops.
 
1. Have PSUs evolved to be "silent" under light loads?  What EVGA ~1000W-1300W PSU would have its fan "off" at something like < 200 Watts?  (ThreadRipper build)
 
2. Should I just replace the fan?  I mean, they are old PSUs after-all and doubt under warranty.  Is there any PWM or alike sensor that will fail if I replace the fan?
 
 
 

The PSU has it's own fan controller and logic that will ramp the fan up/down based on temperature whereas a Molex/other connector can't and it will run at full speed all the time..It's just best to get a 3-wire fan and then cut/splice the wires to the connector, tape them up, and change out the fan while keeping the wiring inside..I've done it a handful of times and it ain't no great big thing, at least to me.

austin86
 
IDK why so many folks have to spread the lie about PSU's having 10 of 1000s of volts inside them. If its unplugged and drained its no more dangerous then a motherboard. And even of you do get shocked its very week if the PSU is unplugged.
 
And its not hard to even discharge a PSU, put a load on all the rails. pull the power cable form it, unplug everything from it and let it sit for a wile. I should make some videos of me manhandling PSU .

I saw no claims of the power supply having tens of thousands of volts. Regardless, voltage is not the issue, which is why you can stand in the field of a tesla coil and not be harmed. The danger comes with the current (Amps) which can cause damage or death with only a small amount, if you don't know what you're doing.