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?
 
 
 

I put a low-noise Noctua case fan in my PSU about 3 years ago and it's been quiet since then without any issues..It's not hard to do, but be aware there are hazardous voltages in a PSU and common sense precautions must be taken..Opening up a PSU is at your own risk..You need a 140mm fan for a SuperNova 1300 G2, and to change the connector, and to make sure the direction of rotation is so that air is blown into the PSU..I would buy another/quieter fan and put in it.
  

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.

We do not recommend opening the PSU, as it can be dangerous if you don't know what you're doing and would also void any warranty the power supply has. If the power supply is indeed 10 years old, it is likely outside of the normal warranty, so perhaps that wouldn't be any concern, but we've heard too many stories of people opening power supplies and getting a shock or even being electrocuted, when they did not know how to properly discharge the unit before getting into it.

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.

The fan ball bearings in my unit randomly crash into each other making a loud clack which is annoying.  After I replace it with an atx 3.1 unit I want to replace the fan myself.  Does anyone know the stock fan number and size (140x20 etc.) so I can source a replacement?