CPU Cooler Buying Guide: Air Cooler or AIO, TDP and Height Explained

Many current gaming processors are sold without a cooler – AMD's Ryzen 9000 product pages explicitly say "Thermal Solution: Not Included". So the cooler is not an accessory but a required part. It helps decide how long your CPU can hold its boost clock and how loud your PC gets under load. In this guide you will learn when an air cooler is enough and when an AIO liquid cooler makes sense, how to read TDP ratings, why height and RAM clearance matter so much, and what AM5 and LGA 1851 mean for mounting. At the end you will find five example coolers.

Transparency: We have not tested these coolers ourselves. Specs come from the manufacturers (Thermalright, be quiet!, Noctua, ARCTIC), from AMD and Intel, and from verified Amazon.de product pages (as of October 2026). We deliberately do not list prices because they change constantly.

Key criteria at a glance

1. What does the CPU maker recommend?

The best starting point is your processor's product page. AMD lists a cooler recommendation there, Intel lists power figures:

The gap between base and turbo power is especially large on Intel: under full load the 265K may draw up to 250 W according to Intel. A cooler with plenty of headroom makes sense if you plan to keep the CPU fully loaded. Our CPU buying guide explains which processor suits you.

2. Reading a cooler's TDP rating

Many cooler makers list a maximum TDP – be quiet!, for example, rates the Pure Rock Pro 3 at 250 W and the Dark Rock Pro 5 at 270 W. These are manufacturer figures and are not directly comparable across brands. That is why Noctua uses its own metric (NSPR) instead of a TDP. As a rule of thumb: if the cooler rating is well above your CPU's power draw, the fan can spin slower in everyday use and stay quieter.

3. Air cooler or AIO liquid cooler?

• Tower air cooler: a heatsink with heat pipes and one or two fans. No pump, nothing can leak, little maintenance. Large dual-tower models also handle powerful gaming CPUs.
• AIO liquid cooler (all-in-one): a pump on the CPU, tubes and a radiator with fans in the case. The block over the socket is small, but the radiator has to fit (240, 280 or 360 mm). The pump is an extra moving part.

For most gaming PCs a good dual-tower air cooler is a solid choice. A 360 mm AIO is mainly worth it for very power-hungry CPUs, when AMD recommends liquid cooling as it does for the 9800X3D, or when space around the socket is tight.

4. Cooler height and your case

Large tower coolers are often 155 to 168 mm tall. Your case maker lists a maximum CPU cooler height – that number must be larger than the cooler's height. Thermalright explicitly notes that the case clearance must exceed the cooler's installation height. For an AIO, check instead whether and where a 240, 280 or 360 mm radiator can be mounted.

5. RAM clearance and offset designs

Wide coolers can overhang the first RAM slots. Tall memory with big heat spreaders or RGB bars can then hit the fan. That is why many current models use an offset design or a height-adjustable front fan – Noctua, for example, lets you raise the NH-D15 G2's front fan (making the cooler taller than 168 mm) or run it with the centre fan only.

6. Sockets: AM5 and LGA 1851

• AMD AM5: According to Corsair, AM5 uses the same cooler bracket size as AM4. Many AM4 coolers therefore still fit; still check the cooler maker's compatibility list.
• Intel LGA 1851: According to Intel, the mounting holes are in the same positions as on LGA 1700. LGA 1700 coolers fit LGA 1851 mechanically. The CPUs themselves are not cross-compatible.

7. Noise, fans and warranty

• Fans: Tower coolers mostly use 120 or 140 mm fans. Manufacturers list speed and noise in dB(A) – compare these figures within one brand, since not every maker measures the same way.
• PWM: A 4-pin PWM connector lets the motherboard adjust fan speed to temperature. All five example coolers below use PWM fans.
• Warranty: be quiet! gives 3 years on the coolers listed here, Noctua and ARCTIC give 6 years on their models.

Which cooler fits which PC?

• 65 W six-core (e.g. Ryzen 5 9600X): a solid dual-tower air cooler with 120 mm fans.
• 120 W gaming CPU (e.g. Ryzen 7 9800X3D): a large dual-tower air cooler or a 360 mm AIO (AMD recommends liquid cooling for optimal performance).
• Intel K models with high turbo power (e.g. Core Ultra 7 265K): lots of headroom, so a high-end dual tower or a 360 mm AIO.
• Quiet PC: a cooler with plenty of headroom, a low noise rating or a quiet mode.

Five example CPU coolers

The following are well-known coolers available on Amazon.de. They are not test winners, just examples for each class. All figures per manufacturer or the verified Amazon.de page.

Example model

Value pick: Thermalright Peerless Assassin 120 SE ARGB

Dual-tower air cooler with six 6 mm heat pipes, a nickel-plated copper base and two 120 mm PWM fans (TL-C12C-S, up to 1550 rpm, 25.6 dBA per Thermalright) with ARGB lighting via a 3-pin 5 V connector.

Type

Dual-tower air cooler

Heat pipes

6 × 6 mm

Fans

2 × 120 mm PWM, ARGB

Height

155 mm

Sockets

AM4, AM5, LGA 115x, 1200, 1700, 1851

A good fit if you want an affordable, proven dual tower for a mid-range CPU and like RGB.

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Example model

Compact dual tower: be quiet! Pure Rock Pro 3 Black

Dual tower rated at 250 W TDP by be quiet!, with six 6 mm heat pipes and two Pure Wings 3 120 mm PWM fans (up to 2000 rpm, 34.8 dB(A) at full speed). The offset design is meant to leave room for RAM and VRM heatsinks; on AM5 the base sits slightly offset over the hotspot according to be quiet!.

Type

Dual-tower air cooler

TDP (manufacturer rating)

250 W

Fans

2 × 120 mm PWM

Dimensions (L × W × H)

139 × 124 × 155 mm

Sockets

AM4, AM5, LGA 115x, 1200, 1700, 1851

Warranty

3 years

A good fit if you want a clean all-black cooler with plenty of headroom for Ryzen 9000 or Core Ultra.

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1525 g with fans

Example model

High-end air cooler: Noctua NH-D15 G2

The second-generation NH-D15 has eight heat pipes and two NF-A14x25r G2 140 mm PWM fans. Noctua includes NT-H2 thermal paste and the SecuFirm2+ mounting system; according to Noctua the regular version is designed for AM5 (with offset mounting) and LGA 1851. There are also LBC and HBC variants for CPUs with different surface curvature.

Type

Dual-tower air cooler

Heat pipes

8 × 6 mm

Fans

2 × 140 mm PWM

Dimensions (H × W × D)

168 × 150 × 152 mm

Weight

1525 g with fans

Sockets

AM4, AM5, LGA 115x, 1200, 1700, 1851

Warranty

6 years

A good fit if you want a very quiet air cooler for a powerful CPU and your case fits a 168 mm cooler.

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Example model

Quiet, no RGB: be quiet! Dark Rock Pro 5

Dual tower rated at 270 W TDP by be quiet!, with seven heat pipes and two Silent Wings fans (120 and 135 mm). A switch toggles between quiet mode (up to 1500 rpm, 23.3 dB(A) max) and performance mode (up to 2000 rpm). The front fan is height-adjustable and there is no lighting.

Type

Dual-tower air cooler

TDP (manufacturer rating)

270 W

Fans

120 mm + 135 mm PWM

Dimensions (L × W × H)

145 × 136 × 168 mm

Sockets

AM4, AM5, LGA 115x, 1200, 1700, 1851

Warranty

3 years

A good fit if a subtle, quiet cooler matters more to you than lighting.

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Example model

360 mm AIO: ARCTIC Liquid Freezer III Pro 360

All-in-one liquid cooler with a 38 mm thick 360 mm radiator, three P12 Pro fans (600–3000 rpm), a PWM-controlled pump and an extra VRM fan on the pump that also cools the motherboard's voltage regulators. A contact frame is included for Intel, and there is offset mounting for both AMD and Intel. The fan cables run inside the tube sleeving.

Type

AIO liquid cooler

Radiator

398 × 120 × 38 mm

Fans

3 × 120 mm PWM

Tube length

450 mm

Sockets

AM4, AM5, LGA 1700, 1851

Warranty

6 years

A good fit if you need to cool a power-hungry CPU and your case can take a 360 mm radiator.

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The models compared

Model	Type	Fans	Height / radiator	Warranty
Thermalright Peerless Assassin 120 SE ARGB	Dual tower	2 × 120 mm	155 mm	n/a
be quiet! Pure Rock Pro 3 Black	Dual tower	2 × 120 mm	155 mm	3 years
Noctua NH-D15 G2	Dual tower	2 × 140 mm	168 mm	6 years
be quiet! Dark Rock Pro 5	Dual tower	120 + 135 mm	168 mm	3 years
ARCTIC Liquid Freezer III Pro 360	AIO	3 × 120 mm	360 mm radiator	6 years

All figures per manufacturer or Amazon.de; "n/a" means we found no manufacturer figure.

Checklist before you buy

1. What does my CPU maker recommend, and how much power can the CPU draw?
2. Does the cooler support my socket (AM5 or LGA 1851)?
3. Is my case's maximum cooler height larger than the cooler's height?
4. Is there enough room for my RAM under the front fan?
5. For an AIO: does the radiator fit my case, and are the tubes long enough?
6. Do I have enough fan headers (4-pin PWM) on my motherboard?

FAQ

Is an air cooler enough for a Ryzen 7 9800X3D?

In principle yes, the CPU also runs with an air cooler. But AMD recommends liquid cooling for the 9800X3D for optimal performance. If you stay with air, choose a large dual tower with plenty of headroom and make sure your case has good airflow.

Is an AIO always better than an air cooler?

No. An AIO needs room for its radiator and has a pump as an extra moving part. A large air cooler needs little maintenance and is enough for many gaming CPUs.

Will my old AM4 cooler fit AM5?

In many cases yes, because according to Corsair AM5 uses the same cooler bracket size as AM4. Still check your cooler maker's compatibility list.

Does an LGA 1700 cooler fit LGA 1851?

According to Intel, yes: the mounting holes are in the same positions. Intel does advise checking with the cooler maker about thermal performance for the new CPU.

Do I need to buy thermal paste separately?

Many coolers include paste – Noctua ships NT-H2, ARCTIC MX-6, and Amazon lists thermal paste in the box for the be quiet! Pure Rock Pro 3. Check what your model includes.

How much does a cooler's TDP rating matter?

It is a rough guide. Since manufacturers measure differently, compare within one brand and leave headroom above your CPU's power draw.

Sources

As of October 2026. Specs come from the manufacturers and the verified Amazon.de product pages (ASINs in the article):

• AMD Ryzen 5 9600X – product specs
• AMD Ryzen 7 9800X3D – product specs
• Intel Core Ultra 7 265K – specifications
• Intel – LGA1700 coolers on LGA1851
• Corsair – AM5 and older cooler brackets
• Thermalright Peerless Assassin 120 SE ARGB
• be quiet! Pure Rock Pro 3 Black
• be quiet! Dark Rock Pro 5
• Noctua NH-D15 G2 – specifications
• ARCTIC Liquid Freezer III Pro 360

Manufacturers occasionally change specs and variants. If something important changes, we will update this article.