somebodyelse
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I have an old Atom330/Ion based machine doing PVR and squeezelite duties. I replaced the original small, noisy fan with a quiet 60mm one on a reduced speed. The fan and 2.5" HDD are quiet, and what noise they make is broadband, so I can't pick out a noise source when it's running. However when it powers on or off the change in background noise level is clearly audible. It's not enough to make me do anything about it for now, but its eventual replacement will definitely be fanless and SSD. If I sat further away from it, or it lived in a cupboard, things might be different.You think a 2.5" HDD will be noisier than the blower fan in the NUC?
The fan in my Acer Revo is a little noisy up close, but is inaudible at listening distance.
My experience with blowers like that one, particularly if they're temperature controlled, is that they aren't a broadband noise so they're more readily identifiable, and the change in noise as the fan speed ramps up and down is particularly irritating. The same applies to axial fans spinning at higher speeds.