The main causes of PC noise are:
Mechanical friction noise generated by micro motors and fan bearings, as well as vibration noise from low quality chassis and improper assemblies.
Turbulence caused by obstructions in the flow of air, such as poorly designed fan grilles and heatsinks.
Noise generated by electrical coils or transformers used in power supplies, motherboards, video cards or LCD monitors.
Noise in personal computers has been increasing with rising computing power and number of transistors on a single die (integrated circuit). More transistors of a given size use more power, which releases more heat. Faster-rotating cooling fans are one common way to remove this heat. Also, motor rotation speed for hard disc drive (HDD) and Optical disc drive (ODD) has been rising for faster data processing with technical advances in micro motors. Faster rotation (usually measured in RPM) causes higher bearing friction, thus more noise, given the same bearing technology.
The noise issue had received widespread attention with AMD's early Athlon CPUs and Intel's Pentium 4 Prescott core CPU known for its excessive heat and bundled fan noise running on high RPM. With the introduction of Home Theatre PCs (HTPC), the excessive heat and noise problem, that had been mostly confined to the overclocking and quiet computing communities, came to the attention of the general public.
The main approaches to reducing noise problems from personal computers are:
Reduce heat generation by using energy efficient parts - nearly all the energy used by a computer is converted into heat.
Improve cooling - by using more efficient cooling parts and lower friction, quieter bearings.
Use Soundproofing to reduce the effects of remaining noise sources.
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