What is a silent computer?
The folks over at Silent PC Review have taken a close look at what actually constitutes a noiseless PC. Notably there was a time when computer manufacturers referred to their computers as noise free, but were actually not.
The take a close look at the difference between a computer that makes enough noise for us to hear, and one which is quiet enough for us to not notice. Noise issues like the regularity of sound are taken into account. For example a irregular sound that goes up and down is much more annoying and noticeable than perhaps a “louder” sound that stays constant, allowing us to block it out.
An apt article from a site dedicated to quiet computers.
Read it here: What is a Silent computer