Both a heat sink and a radiator require airflow and therefore both have fans built in.
Cpu heat sink.
When you use heavy applications such as video games and video editing software the cpu can produce excess heat which may cause your computer to freeze.
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The components that generate the most heat in your computer are the cpu central processing unit video card if your computer has one and the power supply.
They always have some cooling usually a fan.
It is important that such machines stay as cool as possible.
It may also shorten the life of your cpu or cause immediate damage.
Cpu fans and heatsinks help ensure that your pc works efficiently at all times.
All modern computers rely on some form of heat exchanger with higher end models using cpu heat sinks.
Other components that may have a heat sink include the north bridge south bridge and memory.
Large heat sinks help any machine that generates heat as a byproduct such as a car or refrigerator.