Quote (DCSS @ Jun 4 2017 08:03pm)
Just thinking of what could cause them to run louder over time. It's possible the damage is irreversible i.e the sleeve bearing has been partially sanded away by friction but probably not
Dude's got no money so I was tryina help
You actually have a point there. If money is a concern, buying nicer fans may not be that viable of an option. Give that PC a very good clean and analyze for yourself if fans are really needed.
If in fact you really just want fans, Be Quiet! fans are good. Or ofc Noctua.