Why do computers need fans?
Computers need fans and other cooling apparatus to keep the internal components from overheating. Beacause a computer as so many parts that are making millions of calculations and coursing large amounts of electricity through very closely knit circuits, there is going to be a considerable amount of heat build up. There are also components that have moving parts, such as hard disk drives, which have one or more internal, spinning discs, need to stay cool to keep their internal componenests seize. Case fans, CPU heatsinks, video card coolers and liquid cooling systems are all used to maintain an optimal working temperature for your computer hardware.
There are cooling fans for just about every piece of hardware you can install in your system. But you probably don't need to buy a fan for every single piece of hardware. In general the hardware you are most likely to buy fans for are computer cases, CPUs, video cards, and power supplies. Aside from just fans, there are also heatsinks and airfoils that absorb heat directly from the CPU or GPU, which then diffuses in to broad, thin airfoils which help to disperse the heat faster due to their large surface area. We carry brands such as Corsair, Noctua, Cougar, Arctic Cooling, NZXT, Cooler Master, and more to make sure we have the right options for you.
What type of cooling fan do I need?
For processors, you'll need a heatsink and fan to make sure it doesn't overheat. There are many kinds of CPU coolers, from large, high-performance options, to low-profile options that more easily fit in compact cases. If you're building a system with a higher performance processor, you'll want to make it's a pretty hardy cooler, or you may want to look into installing a liquid cooling solution, which uses a closed system to pump liquid across the heatsink to diffuse the heat through the liquid, further dissipated by a fan cooled radiator instead of an all-metal heatsink and fan.
Case Fans come in many sizes, from 40mm to 360mm, and have multiple types of bearings with differing lifetime performance and noise output. The fan blades can also make a difference in noise, but some of the most important specs to pay attention to when it comes to PC fans are the RPMs and air pressure they're able to provide. If you're going to build a higher-performance system with the ability to run quietly, you'll likely want to use Pulse-width Modulation (PWM) fans that are able to adjust automatically to the temperature around them. Keep in mind that these fans must be used with a motherboard that supports the PWM feature, otherwise their heat sensors and auto control features will be useless. Certain Arctic Cooling fans include PWM Sharing Technology (PST), which allows multiple of the same type to share temperature information to create a more cohesive PC cooling system.
Video Card cooling systems are often built onto the card, especially at higher performance levels, but there are some after market GPU coolers in case you purchase an OEM video card that does not include a cooling system.
What is thermal grease?
Thermal grease is generally a inorganic compound that is made of fine particles that conduct heat at a high rate and a loose binding agent that keeps the particles close together and in place between the heatsink and processor. The main function is to improve the rate that heat dissipates from the processor itself into the the heatsink.