Buying a CPU cooler: choose an air cooler or AIO liquid cooler to suit your PC

A CPU cooler needs to match more than just your processor’s performance. The socket, case, radiator position, memory and the level of noise you’re happy with all matter too. If you focus only on the number of fans, ARGB lighting or a high fan speed, it’s easy to overlook important compatibility details.

These are three of the most common buying mistakes:

• Choosing a radiator size without checking the case: A 360mm or 420mm AIO won’t necessarily fit every ATX case. Check the mounting position, radiator thickness and clearance around the motherboard.
• Checking socket support by brand alone: “Intel-compatible” or “AMD-compatible” is too vague. For current systems, look for specific details such as Intel LGA1851, Intel LGA1700, AMD AM5 or AMD AM4.
• Assuming higher fan speeds mean quieter operation: A high maximum speed can provide more cooling headroom, but an unsuitable fan curve can make the system noisier. For a quiet CPU cooler, you’ll need suitable PWM control and a well-ventilated case.

Key things to consider when choosing a CPU cooler

1. Socket and mounting hardware

Before you buy, check the exact processor socket. An Intel LGA1851 cooler needs different or compatible mounting hardware from a model designed for older Intel platforms. For AMD, AMD AM5 coolers and AMD AM4 coolers are particularly popular.

Check for:

• specific socket details rather than general platform names,
• mounting brackets or contact frames included in the box,
• how the cooler attaches to the motherboard,
• any original parts from the AMD retention module that may be required.

Some ARCTIC models use a contact frame for Intel LGA1851 and LGA1700. According to the product details, this is designed to help distribute pressure evenly. Follow the relevant instructions carefully when installing it.

2. Air cooler or AIO liquid cooler?

An air cooler consists of a heatsink tower, heat pipes and a fan. It doesn’t need a pump connection or a sealed liquid loop, which makes installation simpler and reduces the number of potential sources of trouble. Check the cooler’s height, clearance around your RAM modules and airflow inside the case.

A CPU liquid cooler, also known as an AIO liquid cooler, transfers heat to a radiator via a pump and tubes. Before you buy, check that the radiator’s length, width and thickness are compatible with your case:

• 240mm AIO: usually has two 120mm fans and often suits more compact cases.
• 280mm AIO: usually has two 140mm fans; not every case has the right mounting points.
• 360mm AIO: usually has three 120mm fans and needs more space.
• 420mm AIO: usually has three 140mm fans; it’s generally suited to cases with plenty of room at the front or top.

The stated radiator size doesn’t always reflect the total space needed for installation. You’ll also need to allow for the fans, tube routing and motherboard components.

3. Fans, connections and lighting

A 4-pin PWM connector is useful for automatic fan speed control. ARGB lighting usually uses a 3-pin 5V connector. Don’t confuse it with a 12V RGB connector, as this could damage the lighting components.

So, don’t choose an ARGB CPU cooler on looks alone. Check:

• whether your motherboard has a 5V ARGB header,
• whether you need a separate controller,
• how many fan headers are available,
• whether the cables are long enough,
• whether you can control the lighting using your motherboard’s software.

Our picks for different users

Best for: budget-conscious beginners

NZXT T120 RGB Air Cooler RC-TR120-W1

Why it suits this type of user: This compact air cooler is a straightforward option if you’d rather not have a pump and radiator. According to the product details, it has four copper heat pipes, a 120mm fan and RGB lighting.

How this product avoids the pitfall

There’s no need to allow space for a radiator or liquid loop. Even so, check the cooler’s stated height against your case.

Key benefits and strengths

Air cooling, a 120mm fan and support for Intel and AMD sockets, according to the product description.

Best for: budget-conscious beginners

ARCTIC Liquid Freezer III Pro 240 A-RGB

Why it suits this type of user: This 240mm AIO has two 120mm fans, offering a compact liquid cooling option for cases with compatible 240mm mounting points.

How this product avoids the pitfall

The radiator size is clearly stated. Before buying, check that your case supports it and has a 5V ARGB connector.

Key benefits and strengths

240mm radiator, PWM-controlled pump, integrated VRM fan and support for LGA1851, LGA1700, AM5 and AM4, according to the product details.

Best for: buyers who expect high quality

Corsair NAUTILUS 360 RS ARGB AIO

Why it suits this type of user: This 360mm AIO is designed for gaming PCs, content creation systems and workstations with enough room for the radiator.

How this product avoids the pitfall

The three included RS120 ARGB fans and direct motherboard connection are clearly specified. You’ll still need a suitable 360mm mounting point.

Key benefits and strengths

Three 120mm fans, PWM control, ARGB control via the motherboard, and compatibility with LGA1851, LGA1700, AM5 and AM4.

Best for: specialist uses and heavy users

ARCTIC Liquid Freezer III Pro 420 A-RGB

Why it suits this type of user: Designed for larger cases and sustained heavy CPU loads, this model has a 420mm radiator with three 140mm fans. Check the dimensions carefully before buying.

How this product avoids the pitfall

The less common radiator size is clearly stated. This makes it easier to check case compatibility before buying, rather than choosing based on fan count alone.

Key benefits and strengths

420mm radiator, three 140mm P14 Pro fans, PWM pump, VRM fan and ARGB Gen2 lighting, according to the product description.

Installation and use: tips to avoid problems later

1. Check your case manual: Before buying, check the supported cooler heights and radiator positions.
2. Apply thermal paste correctly: Remove the protective film from the cooler’s contact plate and apply the supplied paste as instructed.
3. Plan your airflow: Front fans often draw in cool air, while top or rear fans expel warm air.
4. Set a PWM curve: A moderate fan curve can reduce sudden speed changes and unnecessary noise.
5. Take care with AIOs: Don’t kink the tubes. If you see any liquid, switch off your PC immediately and unplug it from the mains.

CPU cooler FAQs

Which CPU cooler is suitable for gaming?

Depending on your processor and case, a gaming PC could use a tower air cooler or a 240mm, 280mm or 360mm AIO. The key considerations are socket compatibility, cooler height or radiator clearance, and how much noise you’re willing to accept.

How long does an AIO liquid cooler last?

Lifespan depends on factors such as the pump, fans, hours of use, dust levels and whether it’s installed correctly. Don’t open a sealed loop. If the pump makes unusual noises, temperatures rise or you see any liquid, it’s worth having the system checked.

Does a CPU liquid cooler use more power than an air cooler?

An AIO needs extra power for its pump and fans. Actual power consumption depends on the fan speed, control settings and model. An air cooler doesn’t need a pump connection; usually, only its fan is powered through the CPU_FAN header.