Current common chassis "Tiny Cooling Fan" sizes 8cm, 9.2cm and 12cm; CPU fan size is even more varied, with 6cm, 7cm, 8cm, 9.2cm, 12cm, 14cm and even some spend a large size fans; traditional suction-type power supply fan is generally used 8cm size, newly popular type of bottom suction fan is generally 12cm, 14cm also, as series of power. On the use of graphics "Tiny Cooling Fan" are relatively small size, the use of the general household level initiative is generally 4cm radiator graphics products, and various cooling manufacturers upgrade product size is varied. On the graphics card fan in long-winded one, used on ordinary VGA Cooler "Tiny Cooling Fan" base has two isosceles edge and so on, when we need to buy to use on their own to figure out what kind of graphics card specifications and avoid buying products that do not match.