How to choose a CPU cooler

A cooler's one job is to carry heat away from the processor as fast as the processor makes it. So the choice starts from how much heat that is, runs through whether a given cooler can fit your case at all, and ends at how much noise you are willing to trade for the margin. Take them in that order.

Match the cooler to the heat the CPU makes

A processor turns most of the power it draws into heat, and its rated power is the figure to size against — with the note that a modern chip can pull well above its headline rating for short bursts when it boosts. The cooler has to clear that, and clearing it with room to spare is better than just meeting it: a cooler rated for more heat than the chip makes runs further from its limit, which means lower temperatures and, as the next sections cover, less noise to get there.

Undersize it and nothing breaks. The chip protects itself by throttling — dropping its clock speed until the heat it makes falls to what the cooler can remove — so the cost of too little cooling is performance you paid for and cannot use, not a damaged part. That is why the rating to look for is the heat the chip makes at full tilt, not at idle, and why headroom above it is worth having rather than waste.

Air or liquid

The two kinds move heat by different routes. An air cooler runs heatpipes from a plate on the chip up into a stack of metal fins, and a fan blows through the fins to carry the heat into the case air. A liquid cooler — an AIO, all-in-one — pumps liquid through that plate to a radiator mounted at the edge of the case, where its fans push the heat straight out. The difference that matters is where the heat ends up: an AIO relocates it to the case wall, which helps a very hot chip or a build where the space around the socket is tight, while a big air tower dumps it into the case for the case fans to clear.

Neither is better as a rule, and a large air cooler and a mid-size AIO clear similar amounts of heat. Air is the simpler machine — no pump to fail, nothing to leak, and it keeps working quietly for years. Liquid buys you the relocation of the heat and a low profile over the socket, at the cost of a pump that is one more moving part. Pick by the chip's heat and the shape of the case, not by one being the premium choice.

Will it fit

Three fit questions decide whether a cooler goes in, and they are worth settling before price. The first is the socket: a cooler ships with brackets for particular CPU sockets and mounts only on those, so check the cooler's socket list against the one your CPU uses before anything else. The second is height, and it applies to air: a tall tower has a measured height, and the case has a maximum clearance for it, and a cooler taller than the case allows will not let the side panel close. The third applies to liquid: an AIO's radiator comes in set sizes, and the case has specific mount points that fit some and not others.

One more clearance catches people out on air coolers: a wide tower can overhang the memory slots and block a tall heatspreader on a RAM kit. Where the two would meet, either a lower-profile kit or a cooler that clears the slots is the fix.

Noise

Noise comes from the fans, and on a liquid cooler from the pump as well. The lever you have over it is the same headroom from the first section: a cooler with more capacity than the chip needs can move the required heat with its fans turning slowly, and a slow fan is a quiet one. Run a cooler near its limit and the fans spin up to keep pace, which is where the noise is. So the margin you leave for temperature buys quiet at the same time — the cooler sized comfortably above the chip is the one you do not hear.

How coolers are tracked here

A cooler is a single model, not a family of sizes, so its page carries one specification and, where it is sold on its own, one price tracked over time rather than a list price. The figures — socket support, dimensions, rated heat, noise — come from the manufacturer's datasheet, never a test run here, so they describe what a cooler is built to do rather than how it performed in someone's case, which still takes a review to settle.

Every CPU cooler in our catalog is on its own page, with those specs read from the datasheet and a price tracked over time where the cooler is sold separately.