I got home and relaxed before I took time to look at it. It was only the 4 "screws" on the side fan that were left loose. I tighten them (not too much as to break it) and now it's whisper quiet.
What a difference a solid case can do over my previous generic tower self-modified to add 2 side fan (80 and 92mm) and one front one (80 mm). We're talking loud enough to be disturbing when looking at a video on mid-volume... to "I have to pay attention to ear it"
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WOW!
I recommand that case to anybody that can afford it. It's not that I'm rich, but I was patient enough to put 200$ more aside before buying my new PC.