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Some practical issue of PC noise are presented at the following sites.
Cooling Fan Noise Comparison - Sleeve Bearing vs. Ball Bearing (pdf format)
Brief explanation of fan noise origins and noise reduction suggestions
Effect of sweep angle comparison
Comparisons of noise from various 80mm fans
Noise reduction of a specific desktop case
Noise reduction of another specific desktop case
Informal study for noise from CPU cooling fan
Informal study for noise from PC case fans
Active fan speed optimizators for minimum noise from desktop computers
