How empty is their case? It could be mostly reverb thet they are hearing.
Example: I had a Antec 80mm in my wifes crammed mid tower and I could just hear that it was on, when I 'borrowed' it foe my mostly empty Inwin full tower I could hear the fan noise and air moving anywhere in the house.
If you can, just lay the hsf in your case with the fan running and see if it's quieter in there. could save a lot of hassle. of course I guess it could make more since that doesn't negate the possible PSU problem.
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