Certain fans are jsut louder than others, especially older bal-bearing designed ones. Panaflo's are known for being quiet, Delta's as well.
I had a fan that came ith my Dynatron cooler and it pushed over 50cfm's i believe, 4800-5000RPM's (and it was only a 60mm, very thick though) You could hear that thing down the hallway on high. I ran it at 10% power and it was still pretty loud.
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Compaq Presario V5000 laptop