Central processing unit (CPU) fan
A CPU fan cools the entire CPU case of a computer. It can be attached to one side of the casing or mounted directly inside the CPU.
Power supply unit (PSU) fan
A PSU fan cools the PSU of a computer by removing warm air inside the case. It is usually located at the back of the case, over the power unit.
Graphics card fan
A graphics card fan cools the graphics power unit (GPU) and memory of the computer’s graphics card. It is used for advanced graphics card models that generate a large amount of heat.
A chipset fan cools the north bridge of the chipset on a motherboard. It is also used in system bus overclocking.
Peripheral component interconnect (PCI) slot fan
A PCI slot fan cools the card and card slots on the PCI expansion rack. It is usually mounted on one of the PCI slots.
Hard disk fan
A hard disk fan cools the computer’s hard disk. It is ideal for fast-spinning hard disks, which produce more heat than slower models. It is usually mounted next to the hard disk drive.