Personally I like to have a quiet computer and any unnecessary noise should be removed in my opinion. Therefore I have written this guide to a quiet power supply fan: changing your stock PSU fans to quieter ones. I have done this to both my Antec power supplies. I first did this to my PP-403X 400w power supply and for this guide I will be using a PP-303X 300w power supply.
WARNING!Before we begin I must warn you that power supplies contain large capacitors that hold enough electrical charge even when unplugged and powered off to kill you. Do not touch anything in the power supply. Also opening your power supply voids the warrantee. I take no responsibility for anything you do from reading this guide or anything else for that matter.The first thing you will want to do is to turn your computer off and remove the power supply. Place it on the ground somewhere where you have some space to work in.
Take your screwdriver and remove the 4 small screws on the bottom side of the PSU.
Carefully remove the cover of the power supply and inspect the inside of it. If you would like you can use a can of compressed air to blow away the dust that has collected inside of it.
Now take your wire cutter and cut the black and the red wire coming from the fan. Be sure you are cutting the right wires and that you do not touch anything else while cutting.
Unscrew the 4 screws that are holding the stock fan in place again being careful not to touch anything else. Now carefully remove the stock fan and put put it aside.