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be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 vs Thermalright Assassin X 120R Digital ARGB Black

Updated August 2026 — be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 leads on durability and aesthetics.

The be quiet! Pure Rock Pro 3 offers superior cooling performance and quieter operation, while the Thermalright Assassin X 120R is a budget-friendly option with decent features.

Why be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 is better

Cooling Performance

6 heat pipes vs 4 heat pipes

Noise Levels

Designed for quieter operation

Installation

Easier mounting for AM5 CPUs

Why Thermalright Assassin X 120R Digital ARGB Black is better

Price

$24.90 vs $54.90

Digital Features

Includes a digital screen

Size

More compact single tower design

Overall score

be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6
85
Thermalright Assassin X 120R Digital ARGB Black
70

Specifications

Specbe quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6Thermalright Assassin X 120R Digital ARGB Black
Max RPM15002000
Noise Level≤ 25 dB(A)≤ 29.8 dB(A)
Socket SupportAM4/AM5, LGA 1700AM4/AM5, LGA 1851/1700
Fan TypePWMPWM
MaterialCopper/AluminumAluminum

Dimension comparison

be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6Thermalright Assassin X 120R Digital ARGB Black

Overview of the Coolers

In the realm of CPU coolers, the be quiet! Pure Rock Pro 3 Black and the Thermalright Assassin X 120R Digital ARGB represent two compelling options. The Pure Rock Pro 3 is priced at $54.90, while the Assassin X is significantly cheaper at $24.90, making it about 54% less expensive. This price difference is substantial and could influence budget-conscious consumers looking for effective cooling solutions.

Cooling Performance

When it comes to cooling performance, the be quiet! Pure Rock Pro 3 Black is designed with 6 high-performance copper heat pipes, which allow it to maintain peak CPU performance, even in demanding situations like overclocking. The specifically designed fan blades of the Pure Wings 3 120mm PWM fan are optimized for enhanced air pressure, maximizing airflow and cooling efficiency. In contrast, the Thermalright Assassin X 120R features a single tower design with 4 heat pipes and a fan that can reach up to 2000 RPM. While both coolers aim to provide effective heat dissipation, the multi-heat pipe design of the Pure Rock Pro 3 suggests a potentially more robust performance under heavy loads.

Noise Levels

Noise levels are crucial for many users, especially those who prefer a quiet computing environment. The be quiet! Pure Rock Pro 3 is designed to operate quietly, which is a hallmark of the brand. Although specific noise levels aren’t provided, its design emphasizes quiet operation. On the other hand, the Thermalright Assassin X 120R has a maximum operating noise level of ≤ 29.8 dB(A). While this is relatively quiet, it indicates that the Pure Rock Pro 3 may have an edge in user-friendliness for noise-sensitive environments.

Installation Process

Installation is a critical factor for many builders, and both coolers aim to simplify this process. The Pure Rock Pro 3 comes with an easy-to-use mounting kit, allowing for straightforward installation, even for beginners. It features an offset mounting for AMD’s AM5 CPUs, which enhances compatibility with CPU hotspots. Meanwhile, the Assassin X 120R also includes an installation accessory and utilizes the motherboard's original backplate for AMD installations. Although both units are user-friendly, the Pure Rock Pro 3's design specifically caters to newer AMD platforms, potentially making it easier for users with those systems.

Aesthetic Appeal

Aesthetics can play an integral role in cooler choice, especially for those who prioritize the look of their build. The be quiet! Pure Rock Pro 3 Black boasts a striking yet discreet design, combining elegance with performance. Its robust appearance makes a statement in any PC setup. Conversely, the Thermalright Assassin X 120R features a digital screen top cover that not only enhances its visual appeal but also provides real-time CPU and GPU temperature readings. This unique feature may attract users who appreciate both functionality and design in their cooling solutions.

Compatibility

Compatibility with various platforms is essential when choosing a CPU cooler. The be quiet! Pure Rock Pro 3 supports AMD AM4 and AM5 sockets, as well as Intel LGA 1700, 1150, 1151, and 1200. This wide range ensures that it can fit into many modern builds. The Thermalright Assassin X 120R also offers extensive compatibility, supporting AMD AM4 and AM5, and various Intel sockets including LGA 1851, 1700, and the 115X series. Both coolers provide solid support for current CPU platforms, ensuring that users will not face issues in fitting them into their systems.

Price Comparison

The price difference between the two coolers is quite significant. The be quiet! Pure Rock Pro 3 is currently priced at $54.90, while the Thermalright Assassin X 120R is much more budget-friendly at $24.90. This price difference of $30 means that the Assassin X is about 54% cheaper. For users on a tight budget, the Thermalright model may offer a compelling value, especially if performance needs are moderate.

Which should you buy?

Choosing between the be quiet! Pure Rock Pro 3 Black and the Thermalright Assassin X 120R Digital ARGB ultimately depends on individual needs and priorities. If you are looking for superior cooling performance and a quiet operation in demanding environments, the Pure Rock Pro 3 is likely the better choice, despite its higher price. However, if budget is a primary concern and you appreciate features like a digital screen for monitoring temperatures, the Assassin X 120R offers excellent value and compatibility at a lower price point. Both coolers have their strengths, but the decision should hinge on whether you prioritize performance or cost efficiency.