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How to Upgrade a CPU Cooler
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Heat is transferred from the CPU to the heat sink of the cooling fan by way of thermal contact. This is the whole idea behind cooling the CPU. The quality of the contact between the cooler and the CPU is usually the result of how it's clamped onto the CPU. It also depends on the contact with the heat sink. The makers of the various clips want the heat sink to fit as tight as possible. Therefore the more flat contact there is with the heat sink - the more heat can be transferred. This is why thermal grease is used many times to ensure the most contact between the CPU and the heat sink.
The CPU acts as the brain of a computer. It tells the other components what to do when you enter commands into the computer. This is done by electricity passing through a conductive material. When electricity passes through the conductive material, the material will oscillate. The frequency of these oscillations is measured in Megahertz where 1 MHz is 1,000,000 cycles. Therefore, if you have a 500 MHz computer, then it will oscillate at 500,000,000 times per second. The oscillations produce heat and if not controlled it will cause the conductive material to degrade and change its properties.
A system fan is a fan that will cool the entire computer system. Although it will not cool specific components within the computer case it will keep air moving throughout your computer case. In an effort to be competitive, many of the computer manufacturers keep their costs low by only having an exhaust fan at the power supply. In the new era of GHz these exhaust fans do little to keep the inside of your computer cool, let alone the specific component such as the CPU or hard drive.
