Cpu
The noise is coming from fan friction and vibration. Running compressed air through fan components can help reduce noise pollution from dust buildup. Brush-less CPU/GPU fans are significantly quieter than the brush-motor powered fans that come with some factory electronics. Furthermore, some computer cases are designed with noise reduction in mind; Antec designed cases are know for being one of the quietest because they use patented bushings to secure the computer hardware. Moreover, make sure internal wiring is free and clear of all fan blades.
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