be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 vs Thermalright Assassin King 120 SE White ARGB CPU
Updated August 2026 — be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 leads on build quality and cooling performa.
The be quiet! Pure Rock Pro 3 Black offers superior cooling performance and quieter operation, making it the better choice for high-performance builds. The Thermalright Assassin King 120 SE White ARGB is a budget-friendly option with decent performance.
Why be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 is better
Cooling Performance
Superior heat pipe design and airflow optimization.
Noise Levels
Quieter operation under load.
Installation Ease
User-friendly mounting kit.
Why Thermalright Assassin King 120 SE White ARGB CPU is better
Price
Significantly lower cost.
Aesthetics
Vibrant ARGB lighting.
Weight
Lighter design.
Overall score
Specifications
| Spec | be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 | Thermalright Assassin King 120 SE White ARGB CPU |
|---|---|---|
| Socket Support | AM4/AM5, LGA 1700/1150/1151/1200 | AM4/AM5, LGA 1700/1150/1151/1200/1851 |
| Max Airflow | N/A | 66.17 CFM |
| Noise Level | <25 dB(A) | 25.6 dB(A) |
| Fan Type | PWM Fan | PWM Fan |
| Cooling Technology | HDT Technology | AGHP Technology |
Dimension comparison
Design and Aesthetics
Both the be quiet! Pure Rock Pro 3 Black and the Thermalright Assassin King 120 SE White ARGB feature distinct design philosophies that cater to different user preferences. The Pure Rock Pro 3 Black has a sleek and elegant black finish, combining power and sophistication, making it a striking addition to any build. Its compact offset design allows for increased RAM and VRM cooler compatibility, while the adjustable front fan height adds further versatility.
In contrast, the Thermalright Assassin King 120 SE White ARGB boasts a vibrant and colorful ARGB lighting feature, appealing to those who prioritize aesthetics in their builds. The cooler’s white and industrial design offers a modern look, but its larger height might limit compatibility with smaller cases. Ultimately, users seeking a more understated design may prefer the Pure Rock Pro 3, while those looking for flair might lean toward the Assassin King.
Performance Capabilities
When it comes to performance, the be quiet! Pure Rock Pro 3 Black excels with its six high-performance 6mm heat pipes and optimized fan design, ensuring efficient cooling even under heavy loads. This cooler is specifically engineered to keep CPUs at peak performance, making it ideal for overclocking enthusiasts and demanding workstation users.
On the other hand, the Thermalright Assassin King 120 SE White ARGB features five heat pipes with AGHP III technology, which helps mitigate the effects of gravity on cooling efficiency. While it offers solid performance with a maximum airflow of 66.17 CFM and a noise level of 25.6 dB(A), it may not quite match the cooling prowess of the Pure Rock Pro 3. Thus, for those prioritizing high-performance cooling, the Pure Rock Pro 3 may be the better choice.
Installation Process
The installation process for CPU coolers can greatly affect user experience, and here both coolers have their strengths. The be quiet! Pure Rock Pro 3 Black is noted for its user-friendly mounting kit, making installation straightforward and hassle-free. Its design allows users with AMD’s AM5 CPUs to easily center the base plate over the CPU’s hot spots, enhancing performance.
Conversely, the Thermalright Assassin King 120 SE White ARGB is equipped with metal fasteners for Intel and AMD platforms, aiming for a secure installation. While it supports various CPU socket types, the installation process may be less intuitive compared to the Pure Rock Pro 3. For users who value a quick and easy setup, the Pure Rock Pro 3 stands out.
Noise Levels
Noise levels are a critical consideration for users looking to build a quiet PC. The be quiet! Pure Rock Pro 3 Black lives up to its name, featuring a PWM fan designed for low noise operation while maintaining high performance. Its engineering includes optimized fan blades that maximize airflow without generating excessive sound, making it suitable for users who desire a whisper-quiet computing environment.
The Thermalright Assassin King 120 SE White ARGB also emphasizes quiet operation with its TL-C12CW-S PWM fan, rated for a maximum noise level of 25.6 dB(A). While this is commendable, the Pure Rock Pro 3 has a reputation for even quieter performance under load. For the quietest operation, the Pure Rock Pro 3 may have the edge.
Cooling Technology
The cooling technology employed in each cooler significantly impacts their efficiency. The be quiet! Pure Rock Pro 3 Black utilizes six high-performance copper heat pipes with HDT (Heat Pipe Direct Touch) technology, providing effective thermal transfer directly from the CPU to the cooler. This design ensures that heat is dissipated efficiently, even during intense usage.
In contrast, the Thermalright Assassin King 120 SE White ARGB incorporates five heat pipes using AGHP technology, which also aims to enhance cooling efficiency. Although it effectively handles thermal management, it may not reach the same level of performance as the Pure Rock Pro 3 under extreme conditions. Users focused on cutting-edge cooling technology may favor the Pure Rock Pro 3.
Price Comparison
Price is often a decisive factor when choosing between products. The be quiet! Pure Rock Pro 3 Black is priced at $54.90, while the Thermalright Assassin King 120 SE White ARGB offers a significantly lower price of $19.82. This makes the Assassin King about 64% cheaper than the Pure Rock Pro 3, which can be appealing for budget-conscious buyers.
However, it’s essential to consider what you get for that price. The Pure Rock Pro 3 provides advanced cooling capabilities and a more robust build quality, while the Assassin King offers good value for its price but may compromise slightly on performance. Depending on your budget and cooling needs, the price difference plays a crucial role in the decision-making process.
Compatibility
In terms of compatibility, both coolers support a wide range of CPU sockets. The be quiet! Pure Rock Pro 3 Black is compatible with AMD AM4/AM5 and Intel LGA 1700/1150/1151/1200 sockets, making it versatile for various builds. Its compact size also increases compatibility with RAM and VRM coolers.
The Thermalright Assassin King 120 SE White ARGB also supports a variety of sockets, including AMD AM4/AM5 and Intel LGA 1700/1150/1151/1200/1851. While it offers broad compatibility, its larger height may limit installation options in smaller cases. Overall, both coolers are versatile, but the Pure Rock Pro 3 may offer slightly better compatibility due to its design.
Which should you buy?
Choosing between the be quiet! Pure Rock Pro 3 Black and the Thermalright Assassin King 120 SE White ARGB ultimately depends on your specific needs. If you prioritize top-tier cooling performance, quiet operation, and ease of installation, the Pure Rock Pro 3, despite its higher price of $54.90, is the superior choice. However, if you are on a tight budget and still want a reliable cooler, the Assassin King, priced at $19.82, provides excellent value. Assess your cooling requirements and budget to make the best decision for your build.

