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be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 vs Thermalright Assassin X 120R SE V2 CPU Cooler, 4×

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

The be quiet! Pure Rock Pro 3 offers superior performance and aesthetics, while the Thermalright Assassin X 120R SE V2 is a budget-friendly option with decent cooling capabilities.

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

Performance

Better cooling efficiency under load

Design

Premium aesthetic appeal

Noise Level

Quieter operation under load

Why Thermalright Assassin X 120R SE V2 CPU Cooler, 4× is better

Price

Significantly cheaper

Installation

User-friendly installation guide

RGB Lighting

Modern RGB features for customization

Overall score

be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6
85
Thermalright Assassin X 120R SE V2 CPU Cooler, 4×
65

Specifications

Specbe quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6Thermalright Assassin X 120R SE V2 CPU Cooler, 4×
Heat Pipes6x 6mm4x 6mm
Fan SpeedPWM1550 RPM
Noise LevelLow25.6 dB(A)
CompatibilityAM4/AM5, LGA 1700/1150AM4/AM5, LGA 1700/1150
Price$54.90$16.59

Dimension comparison

be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6Thermalright Assassin X 120R SE V2 CPU Cooler, 4×

Overview of the CPU Coolers

In this comparison, we will explore the be quiet! Pure Rock Pro 3 Black CPU Air Cooler and the Thermalright Assassin X 120R SE V2 CPU Cooler. The Pure Rock Pro 3 is priced at $54.90, while the Assassin X 120R SE V2 comes in at a significantly lower price of $16.59, making it about 70% cheaper. Both coolers are designed for high performance and compatibility with a range of AMD and Intel sockets. However, their features and intended use cases differ, which we will delve into in the following sections.

Design and Build Quality

The be quiet! Pure Rock Pro 3 is designed with a striking black finish and features six high-performance 6mm heat pipes, complemented by a 120mm PWM fan. Its double-tower design and offset layout enhance RAM and VRM compatibility, making it suitable for various builds. The cooler stands out with its elegant design that combines functionality with aesthetics.

In contrast, the Thermalright Assassin X 120R SE V2 has a more utilitarian approach, featuring an aluminum heat sink and four 6mm heat pipes. Its 120mm RGB PWM fan adds a touch of flair but is primarily focused on performance. The cooler measures 148mm in height, which allows compatibility with medium-sized computer cases. While both coolers are well-built, the Pure Rock Pro 3 offers a more premium look and feel.

Performance

When it comes to cooling efficiency, the be quiet! Pure Rock Pro 3 boasts a robust design that keeps CPUs cool even under demanding workloads. The optimized fan blades and funnel-shaped air outlet enhance airflow, ensuring peak performance. This cooler is particularly appealing for users who plan on overclocking their CPUs.

On the other hand, the Thermalright Assassin X 120R SE V2 offers a fan speed of 1550 RPM, which delivers a maximum airflow of 66.17 CFM while maintaining a noise level of up to 25.6 dB(A). This cooler is engineered to provide efficient cooling with low noise, making it an excellent choice for quieter systems. While it may not match the Pure Rock Pro 3 in extreme conditions, it holds its own for most moderate usage scenarios.

Installation Process

The installation of the be quiet! Pure Rock Pro 3 is designed to be straightforward, thanks to its user-friendly mounting kit. This ease of installation is particularly beneficial for users who may be new to building PCs. The cooler’s offset mounting allows for precise placement over CPU hotspots, which is a thoughtful feature for AMD AM5 users.

Conversely, the Thermalright Assassin X 120R SE V2 also emphasizes ease of installation, providing metal fasteners compatible with both Intel and AMD platforms. This cooler includes a comprehensive installation guide, making it accessible for various skill levels. While both coolers are designed for user-friendliness, the Pure Rock Pro 3 offers additional benefits with its specific design for better heat distribution.

Noise Levels

In terms of noise levels, the be quiet! Pure Rock Pro 3 lives up to its brand name, designed to operate quietly even when under load. The PWM fan's optimized performance ensures that users experience minimal noise, making it ideal for quiet computing environments or gaming setups.

The Thermalright Assassin X 120R SE V2 features a low-noise operation as well, with its S-FDB bearing minimizing vibrations and noise. Although it reaches a noise level of up to 25.6 dB(A), it is still classified as a quiet operation. Users who prioritize silence may lean towards the Pure Rock Pro 3, which is tailored for discretion, while the Assassin X is adequate for most users who desire a balance between performance and noise.

Aesthetic Appeal

The aesthetic design of the be quiet! Pure Rock Pro 3 is one of its defining features. Its sleek black finish and elegant lines not only enhance the visual appeal of a PC build but also reflect its performance-oriented ethos. The cooler stands out as a statement piece in any setup, combining style with substance.

In comparison, the Thermalright Assassin X 120R SE V2 incorporates RGB lighting, which adds a modern touch to its overall design. This feature appeals to gamers and PC enthusiasts seeking to personalize their builds. While it may not have the refined elegance of the Pure Rock Pro 3, its RGB elements provide a different kind of visual appeal that some users may prefer.

Price Comparison

The price difference between the two coolers is significant, with the Thermalright Assassin X 120R SE V2 priced at $16.59, which is about 70% less than the be quiet! Pure Rock Pro 3 at $54.90. This makes the Assassin X an attractive option for budget-conscious consumers looking for a capable cooler without breaking the bank. However, the Pure Rock Pro 3 justifies its higher price with superior build quality, performance, and aesthetic appeal.

Which should you buy?

Ultimately, the choice between the be quiet! Pure Rock Pro 3 Black CPU Air Cooler and the Thermalright Assassin X 120R SE V2 CPU Cooler hinges on your specific needs and budget. If you seek superior performance, a premium design, and quieter operation, the Pure Rock Pro 3 is worth the investment. However, if you are looking for a cost-effective solution that still offers solid cooling performance, the Assassin X is a commendable option. Both coolers have their strengths, making them suitable for different types of users in the ever-evolving landscape of PC building.