I just put in a watercooling system a week or so ago... Its pretty hard to not have at least one fan, while you can cool your CPu/GPU/RAM etc with seperate waterblocks, you still need a little airflow to keep your case's ambient temperature from going off the charts. Ive tried to go totally silent, and my attention has been focusing on a thick walled case, and big fans going sloooow. Water cooler pumps make noise too!