Main article: Computer case Antec P, with isolated chambers for more segregated airflow Another example of the Antec P, this one demonstrating the use of the Scythe Ninja, a fanless CPU cooler Case designed for low noise usually include quiet fans, and often come with a quiet power supply. Undervolting and underclocking can also be used with chipsets and GPUs. The APUs range from 65 W for the lower-end dual-core variants, such as the A4, to W in the higher-end quad-core variants, such as the A8. The slots and ports found on a motherboard include: Peripheral Component Interconnect PCI - connections for video, sound and video capture cards, as well as network cards. Causes of noise[ edit ] The main causes of PC noise are: Mechanical friction generated by disk drives and fan bearings Vibration from disk drives  and fans Air turbulence caused by obstructions in the flow of air Air vortex effects from fan blade edges   Electrical whine : noise generated by electrical coils or transformers used in power supplies , motherboards , video cards or LCD monitors.
The motherboard, CPU, and video card are major energy users in a computer. The APUs range from 65 W for the lower-end dual-core variants, such as the A4, to W in the higher-end quad-core variants, such as the A8. High wattage power supplies will typically be less efficient when lightly loaded, for instance when the computer is idle or sleeping. Without knowing how it was measured, it is not possible to verify these claims, and comparisons between such measurements e. Many of today's CPUs can run stably at their stock speed, or even with a slight overclock, at a reduced voltage, which reduces heat output. Fans draw in dust along with outside air; it can build up quickly inside the computer. Defragment hard drives to reduce the drive heads' need to search widely for data. Energy Star , in , and similar programs led to the widespread adoption of sleep mode among consumer electronics, and the TCO Certified program promoted lower energy consumption. The heat produced by CPUs can be further reduced by undervolting , underclocking or both. The inside of a case can be lined with dampening materials to reduce noise by: attenuating the vibration of the case panels via extensional damping or constrained-layer damping reducing the amplitude of the vibration of the case panels by increasing their mass absorbing airborne noise, such as with foam. Everything that runs the computer or enhances its performance is either part of the motherboard or plugs into it via a slot or port. A quiet power supply is selected to be efficient while providing enough power for the computer. Motherboard voltage regulators also often have heat sinks and may need airflow to ensure adequate cooling. The motherboard's main job is to hold the computer's microprocessor chip and let everything else connect to it. Set operating system to spin down hard drives after a short time of inactivity. The chipset is part of the motherboard's logic system and is usually made of two parts -- the northbridge and the southbridge. Typically, motherboard video takes less power, but provides lower gaming or HD video decoding performance. The form factor affects where individual components go and the shape of the computer's case. Lowering a DC fan motor's supply voltage will reduce its speed while making it quieter and lowering the amount of air the fan moves. Individual components in a quiet PC[ edit ] The following are notes regarding individual components in quiet PCs. A power supply of appropriate wattage for the computer is important for high efficiency and minimizing heat. Arrange components and cables to improve airflow. Undervolting and underclocking generally require motherboard support, but when available can be used to reduce energy use and heat output, and therefore cooling requirements. Airflow[ edit ] Noise-optimized cases   often have ducting and partitioning within the case to optimize airflow and to thermally isolate components. Main article: Motherboard Passively cooled northbridge chipsets help reduce noise. Some systems feature dual BIOS, which provides a backup in case one fails or in case of error during updating.
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