My new ones quite quiet for having 2x120s and 1x80 and the zalman 9500, compared to old one which was made the ground shake. I dont notice the noise/or lack of noise anymore.
Let me put it this way, My computer is so Loud that when I have my TV on and my computer on at the same time, I need the TV volume to be at 17 to hear it clearly. When my computer is off I need my TV volume to be on 6 to hear it clearly.
I have 2 120MM sunon "Tornado Fans" and 3 80MM ones at like 23 DB.
My computer sounds like a dump truck driving through a nitro gilserin plant. Sometimes i'll kick it and it will shut up for a bit and sometimes it sounds like there are crickets inside the computer. I'm pretty sure this is because they are all cheap fans that came with my computer when I baught it back in 2002 and they are wearing out.