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 build quality and cooling performa.
The be quiet! Pure Rock Pro 3 excels in performance and noise levels, while the Thermalright Assassin X 120R offers a budget-friendly option with decent features.
Why be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 is better
Cooling Performance
More heat pipes for better cooling
Noise Levels
Designed for quieter operation
Installation
Easier installation with offset mounting
Why Thermalright Assassin X 120R Digital ARGB Black is better
Price
Significantly lower cost
Aesthetics
Digital screen and ARGB lighting
Compatibility
Fits in more cases due to height
Overall score
Specifications
| Spec | be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 | Thermalright Assassin X 120R Digital ARGB Black |
|---|---|---|
| Cooling Type | Air | Air |
| Fan Type | PWM | PWM |
| Material | Copper | Copper |
| ARGB | No | Yes |
| Mounting Kit | Easy | Standard |
Dimension comparison
Overview of the Coolers
The be quiet! Pure Rock Pro 3 Black CPU Air Cooler is priced at $54.90, while the Thermalright Assassin X 120R Digital ARGB Black CPU Air Cooler comes in at a much lower $22.90. This represents a price difference of about 58%, making the Thermalright cooler significantly more budget-friendly. Both coolers aim to provide efficient cooling solutions, but their design philosophies and features cater to different user needs and preferences.
Design and Aesthetics
Both coolers offer unique designs aimed at enhancing the overall appearance of a PC build. The be quiet! Pure Rock Pro 3 features a sleek black finish with a double-tower design that combines power and elegance. Its compact offset design allows for increased RAM and VRM cooler compatibility, making it a practical choice for various setups. In contrast, the Thermalright Assassin X 120R boasts a digital screen on its top cover, enhancing its aesthetics while also providing practical functionality. The ARGB lighting on the Thermalright cooler allows for color synchronization with the motherboard, appealing to users who prioritize visual customization.
Cooling Performance
When it comes to cooling performance, the be quiet! Pure Rock Pro 3 is equipped with 6 high-performance 6mm heat pipes, ensuring that it maintains optimal CPU temperatures even under heavy loads or overclocking situations. Its 120mm PWM fan is designed for high air pressure, which further maximizes airflow. On the other hand, the Thermalright Assassin X 120R features a 2000 RPM fan speed and 4 heat pipes that utilize upgraded AGHP technology. This design helps combat anti-gravity effects during installation, enhancing its cooling efficiency. Both coolers are effective, but the be quiet! model may have a slight edge in sustained performance due to its additional heat pipes.
Noise Levels
In terms of noise output, the be quiet! Pure Rock Pro 3 lives up to its name, featuring a fan designed for quiet operation. Its optimized fan blades and funnel-shaped air outlet help reduce noise while maintaining cooling efficiency. The Pure Rock Pro 3 is an ideal choice for users who want a silent system without sacrificing performance. Conversely, the Thermalright Assassin X 120R also focuses on noise reduction with silicone corner pads designed to minimize vibration noise. While both coolers aim for quiet operation, the be quiet! cooler is specifically engineered to excel in this area.
Installation Process
Installation is straightforward for both coolers, but each has its unique strengths. The be quiet! Pure Rock Pro 3 comes with a self-explanatory mounting kit, making the installation process easier than ever. Its offset mounting for AMD AM5 CPUs ensures optimal placement over hot spots, which can be a significant advantage for those using AMD processors. On the other hand, the Thermalright Assassin X 120R also emphasizes compatibility, with a height of 151mm that fits most cases without compromising performance. While both coolers are user-friendly, the Pure Rock Pro 3 may offer more tailored features for specific CPU configurations.
Compatibility
Compatibility is a crucial factor when choosing a CPU cooler. The be quiet! Pure Rock Pro 3 supports a wide range of sockets, including AMD AM4 and AM5 as well as Intel LGA 1700, 1150, 1151, and 1200. This extensive compatibility makes it versatile across different builds. The Thermalright Assassin X 120R also supports a similar range of sockets, including AM4, AM5, and Intel LGA 1700, 1150, 1151, and 1200. Both coolers are designed to fit modern systems, but the additional design elements of the be quiet! cooler can enhance compatibility with RAM clearance.
Price Comparison
The price difference between the two coolers is quite striking. At $54.90, the be quiet! Pure Rock Pro 3 is about 58% more expensive than the Thermalright Assassin X 120R, which retails for only $22.90. This substantial price gap may sway budget-conscious consumers towards the Thermalright option, especially considering that it still offers solid performance and features. However, for users willing to invest more for potentially better cooling performance and quieter operation, the be quiet! model may justify its higher price.
Which should you buy?
Choosing between the be quiet! Pure Rock Pro 3 and the Thermalright Assassin X 120R ultimately depends on your specific needs and budget. If you prioritize quiet operation, aesthetic design, and high-end cooling performance, the be quiet! model is likely the better investment. However, if you're looking for a cost-effective solution that still delivers decent performance and visual flair, the Thermalright cooler is an excellent choice. Each cooler serves its purpose well, but your decision should be guided by the balance of price, performance, and personal preference.

