Since a month or so I've bought myself a new case and watercooling. I have 5*120mm fans which cool my wc and mobo really good at a almost no noise at all (all on a fancontroller). I can even put the fans off and still my cpu etc are cooled well enough.

This is the exact reason why I bought this wc-setup, I like to keep my computer on at night and I like my computer dead silent as well when I need to study.

And here comes the problem, I bought an OCZ Modstream 520w for its silent operation.. but it's not that silent at all. It is the one part in my computer which makes a noise and it really annoys me .

Anyone here can help me with this? What fan should I replace the original with and are there any important things I need to take in consideration?

Thx

Important things to take into consideration: It will void your warranty.

If you are dead set on replacing the fan go with a S-Flex. But if I were you I'd get the Enermax 500 Liberty or a Corsair 530 Watt. Both are probably the quitest power supplies you can get. Or get the Antec Phantom that produces no noise at low loads.

Warranty is already voided, another psu is too expensice for me .

I don't think your PSU would like it if you tinkered with its fan; depends on the heat it produces under load. You could trim the fan with a potentiometer, but for that you'd have to open the PSU up and that's not everybodys thing...

As long as your psu doesn't get too hot there isn't really a problem.. The fan used isn't a really good one, it doesn't have that much of airflow and it makes a 'flickering' sound, even at really low speeds. I already opened the psu, changing the fan doesn't seem to be that hard.