A heatsink and fan (HSF), also known as a CPU Cooler, sits atop the CPU to draw heat away from the CPU and disperse it, because CPUs produce heat while operating. Most CPUs will come with a free “stock” HSF.

But if you buy a CPU that comes without a cooler and/or if you plan to overclock your CPU, you will need to buy an “aftermarket” HSF like one of those listed in the chart below.

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