Does the PC Power & Cooling help to add to the noise. I think the loudest components I have in my systems are the following.
PC Power & Cooling 410w 'silent'
2 x 40mm fans for two SATA enclosures.
I have six computers at home and it appears that it's these two items that make the most noise and when you consider that I over 10 drives (including two 73.4GB Cheetahs) consisting of 2TB of storage with 8 processors, it has to be pretty bad to be able to discern what is making the most noise. I hate 40mm fans, 32dB is too loud. Good grief, my dual Xeon would practically be silent (except for when the drives are working) if it was not for those stupid 40mm fans.
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