How to choose the right CPU cooler

Is the boxed cooler good enough?

It is good enough to keep the processor alive and within its safe limits. That is what it was designed to do, and it does it.

What it does not do is keep the chip cool enough to hold its highest speeds for long, or stay quiet while trying. Under a sustained load the fan spins up and the chip settles at a lower clock than it is capable of.

In a Delhi flat in May, with room temperature already high, that gap widens. A tower cooler is one of the cheapest improvements you can make to how a machine feels day to day.

Air or liquid?

Air coolers are simpler, cheaper, and have nothing in them that can leak or wear out except a fan you can replace. A good tower cooler keeps up with all but the hottest processors.

Liquid coolers move heat away from the processor to a radiator at the edge of the case, which helps in two situations: very hot chips, and cabinets where a big tower cooler would choke the airflow or not fit at all. They also have a pump, and a pump is a moving part with a life span.

Our default recommendation for a mid range gaming build is a good air cooler. Liquid makes sense at the top end and in small cases.

Will the cooler actually fit?

Three clearances to check, and they are all published numbers. Cooler height against the cabinet's stated maximum. Memory height against the cooler's overhang, because tall RGB memory and wide coolers fight each other. Radiator size against what the case supports at the top and front.

Check the socket compatibility too. Most coolers ship with brackets for current Intel and AMD sockets, but not all of them cover every socket, and a missing bracket means a return trip.

How many case fans do you need?

Two is the working minimum: one bringing cool air in at the front, one pushing hot air out at the back. Three or four is better in a warm room, and most cabinets support more than they ship with.

Keep intake slightly stronger than exhaust. Positive pressure pushes dust through the filters rather than every gap in the case, and in Delhi dust is the thing that actually degrades cooling over a year.

Clean the filters. A machine that ran cool in January and throttles in June usually has a front filter packed solid.

Does thermal paste matter?

The paste that comes pre-applied on a boxed cooler or in the tube with an aftermarket one is fine. The difference between a decent paste and an expensive one is a couple of degrees, which is not worth thinking about.

What matters is applying it at all, applying enough, and mounting the cooler evenly. Paste also dries out over the years, so a machine that has got hotter with age and has clean filters is often just due for a repaste.

From the counter

Every summer we get the same machines back. Nothing is broken. The room is hotter, the filters are full, and the paste is four years old. Half an hour on the bench and the machine behaves again.

If your PC is loud in June and quiet in December, it is not a fault. It is telling you the cooling has no margin left.

Frequently asked questions

What temperature is too hot for a processor?

Modern chips are designed to run warm and will protect themselves by slowing down before anything is damaged. Sitting in the eighties under a heavy sustained load is common and not dangerous. What you want to avoid is hitting the throttle point constantly during ordinary use, because that means you are losing performance you paid for. Check the manufacturer's stated maximum for your exact model rather than trusting a general rule.

How long does a liquid cooler last?

The pump is the wear item, and manufacturers typically warrant these units for several years. In practice they run well past that, but they do eventually fail, and when a pump stops the processor heats up very quickly. Air coolers have no equivalent failure mode. If the machine is a working tool that has to be reliable for years, that difference is worth weighing.

Does a bigger radiator always cool better?

More surface area moves more heat, so a 360mm unit has more capacity than a 240mm one. Whether you need that capacity depends on the processor. On a mid range chip the larger radiator mostly buys you lower fan speeds and less noise rather than meaningfully lower temperatures. Buy the size your case actually supports, and check the top clearance, because a thick radiator plus fans can collide with the motherboard.

Should the radiator go on the top or the front?

Top mounted as exhaust is the usual choice and it keeps air bubbles away from the pump. Front mounted as intake gives the processor slightly cooler air but pushes warm air over the graphics card. Either works. What matters more is that the pump sits lower than the highest point of the loop, so avoid mounting the radiator below the pump.

How often should I clean the inside of my PC?

Every three to six months in Delhi, which is more often than guides written elsewhere suggest. Dust here is heavier and the filters clog faster. Compressed air or a soft brush on the filters, the cooler fins and the fan blades covers most of it. Hold the fans still while you blow air through them so they do not spin up. If you would rather not open the machine, bring it in and we will clean it.

Browse what we have in stock: Air CPU coolers, AIO liquid CPU coolers, 360mm AIO coolers.

Read next

• How to choose the right processor
• How to choose the right cabinet
• How to choose the right graphics card

Written by Shreyansh Jain, who runs Get Right PC and is second generation in Nehru Place. Published 2026-09-24. Last updated 2026-09-24.