be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 vs Thermalright Peerless Assassin 120 SE CPU Cooler,
Updated August 2026 — be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 leads on performance and cooling.
The be quiet! Pure Rock Pro 3 excels in quiet operation and design, while the Thermalright Peerless Assassin 120 SE offers a more budget-friendly option with dual fans. Choose based on your priority for noise or price.
Why be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 is better
Cooling Performance
be quiet! has superior heat dissipation technology.
Noise Level
be quiet! is designed for quieter operation.
Design
be quiet! offers a more elegant aesthetic.
Why Thermalright Peerless Assassin 120 SE CPU Cooler, is better
Price
Thermalright is cheaper by $4.91.
Fan Count
Thermalright has dual fans for better airflow.
Market Presence
Thermalright has over 20 years of experience.
Overall score
Specifications
| Spec | be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 | Thermalright Peerless Assassin 120 SE CPU Cooler, |
|---|---|---|
| Heat Pipe Tech | HDT | AGHP |
| Fan Speed | N/A | 1550 RPM |
| Noise Level | <25 dB(A) | ≤25.6 dB(A) |
| Socket Compatibility | AM4, AM5, LGA 1700 | AM4, AM5, LGA 1700 |
| Installation Ease | Easy Mounting Kit | Platform Specific |
Dimension comparison
Price Comparison
The be quiet! Pure Rock Pro 3 Black is priced at $54.90, while the Thermalright Peerless Assassin 120 SE comes in at $49.99. This means the Thermalright cooler is about 17% cheaper than the be quiet! model. For users on a budget, the lower price point of the Thermalright may be appealing, especially considering that both coolers offer similar features in terms of cooling performance and compatibility. However, the difference in price may also reflect varying brand reputations, design elements, or additional features that could influence a buyer's decision.
Cooling Performance
Both coolers are designed to handle demanding workloads and maintain optimal CPU temperatures. The be quiet! Pure Rock Pro 3 features six high-performance 6mm heat pipes with HDT technology, which ensures efficient heat dissipation. On the other hand, the Thermalright Peerless Assassin 120 SE utilizes six heat pipes with AGHP technology, which addresses the inverse gravity effect. This means that while both coolers claim strong cooling performance, the methods they employ might slightly differ, potentially impacting performance in specific orientations or setups.
Fan Design and Noise Levels
The be quiet! Pure Rock Pro 3 is equipped with a 120mm PWM fan, designed for quiet operation, making it suitable for users who prioritize a silent PC setup. In contrast, the Thermalright Peerless Assassin 120 SE features dual 120mm PWM fans that can reach a speed of 1550 RPM. While the Thermalright cooler has the advantage of dual fans, which can improve airflow, it is essential to note that the noise levels of the fans are specified at a maximum of 25.6 dB(A). This could be a deciding factor for users sensitive to noise, as the be quiet! model may offer a quieter experience.
Compatibility and Installation
Both coolers are compatible with a range of AMD and Intel sockets, including AM4, AM5, LGA 1700, and LGA 1150/1151/1200. The be quiet! Pure Rock Pro 3 claims to have a compact offset design that enhances RAM and VRM cooler compatibility, which could be beneficial for users with limited space. Installation for both coolers is reportedly user-friendly, with the be quiet! cooler emphasizing its easy-to-use mounting kit. However, the Thermalright cooler also mentions that it comes with specific mounting hardware for different platforms, which might appeal to users who want more tailored installation options.
Brand Reputation and Market Presence
The be quiet! brand is known for its focus on silent PC components, while Thermalright has established itself as a player in the market for over 20 years. Both brands have a solid reputation among PC enthusiasts, but be quiet! tends to emphasize quiet performance in its products. This focus could make the be quiet! Pure Rock Pro 3 more attractive to users who prioritize a noise-free experience. On the other hand, Thermalright's long-standing presence in the market may provide a sense of reliability and trust for users considering the Peerless Assassin 120 SE.
Design and Aesthetics
In terms of design, the be quiet! Pure Rock Pro 3 boasts a sleek black appearance with a striking yet discreet look, making it a visually appealing addition to any build. The design aims to combine power and elegance, ensuring that it not only performs well but also enhances the overall aesthetic of the PC. Conversely, the Thermalright Peerless Assassin 120 SE also offers a robust design but emphasizes its double-tower cooling solution, which may appeal to users looking for a more aggressive cooling look. The visual differences between the two could sway potential buyers depending on their personal design preferences.
Customer Feedback and Market Performance
While specific sales rankings were not provided for either cooler, the price points and features suggest that both products are competitive in the CPU cooler market. The lower price of the Thermalright Peerless Assassin 120 SE may attract more budget-conscious buyers, while the be quiet! Pure Rock Pro 3’s emphasis on quiet operation could appeal to those looking for a premium cooling solution. Customer reviews and feedback on platforms like Amazon could provide additional insights, but the features and specifications suggest both coolers have their strengths that cater to different user needs.
Which should you buy?
Deciding between the be quiet! Pure Rock Pro 3 Black and the Thermalright Peerless Assassin 120 SE boils down to what you value more in a CPU cooler. If you prioritize a quieter operation and a sleek design, the be quiet! model may be the better choice for you, despite its higher price of $54.90. However, if you're looking for a more budget-friendly option with dual fans and effective cooling performance, the Thermalright cooler at $49.99 could be the way to go. Ultimately, both coolers offer solid performance and compatibility, so your choice will depend on your specific needs and preferences.

