Noctua NH-L12S vs Thermalright Peerless Assassin 120 SE Black CPU Cooler
Updated August 2026 — The Noctua NH-L12S excels in build quality and noise performance, while the Thermalright Peerless Assassin 120 SE Black offers great value for budget-conscious users.
The Noctua NH-L12S excels in build quality and noise performance, while the Thermalright Peerless Assassin 120 SE Black offers great value for budget-conscious users.
Why Noctua NH-L12S is better
Build Quality
Premium construction and materials
Noise Levels
Designed for ultra-quiet operation
Thermal Paste
Includes high-end NT-H1 thermal paste
Why Thermalright Peerless Assassin 120 SE Black CPU Cooler is better
Price
More affordable option
Cooling Performance
Dual fans provide strong airflow
Height Compatibility
Taller design fits more cases
Overall score
Specifications
| Spec | Noctua NH-L12S | Thermalright Peerless Assassin 120 SE Black CPU Cooler |
|---|---|---|
| Brand | Noctua | Thermalright |
| Socket Support | LGA1851, LGA1700, AM4 | LGA1150, AM4 |
| Fan Speed (RPM) | PWM | 1550 |
| Noise Level (dB) | Low | ≤25.6 |
| Cooling Type | Low-profile | Dual tower |
Dimension comparison
Introduction to CPU Coolers
When choosing a CPU cooler, two popular options often come to mind: the Noctua NH-L12S and the Thermalright Peerless Assassin 120 SE Black. Both coolers offer distinct features and advantages, catering to different user needs and budgets. Priced at C$87.95, the Noctua NH-L12S is positioned as a premium low-profile cooler, while the Thermalright Peerless Assassin 120 SE Black is a more budget-friendly option at C$46.79. This comparison will help you determine which cooler best suits your requirements.
Design and Build Quality
The design and build quality of a CPU cooler can significantly affect its performance and compatibility. The Noctua NH-L12S boasts a compact, low-profile design with a total height of just 70mm, making it ideal for ITX and HTPC systems. In contrast, the Thermalright Peerless Assassin 120 SE Black features a taller double tower design measuring 155mm in height. This difference in height can impact compatibility with various cases, particularly those with limited vertical space. The Noctua’s premium-quality construction is designed for quieter operation, while the Thermalright’s blackened finish and dual fan setup aim to enhance cooling efficiency.
Cooling Performance
Cooling performance is a critical factor for any CPU cooler, particularly for those handling high-performance processors. The Noctua NH-L12S employs a highly optimised NF-A12x15 120mm fan, which offers PWM support and an impressive low-noise operation. Although specific cooling performance metrics are not provided, Noctua's reputation suggests effective cooling for moderate heat loads. On the other hand, the Thermalright Peerless Assassin 120 SE Black features dual PWM fans that can reach speeds of 1550 RPM, delivering a maximum air volume of 66.17 CFM. This configuration indicates a robust cooling capability, especially for users pushing their CPUs to higher performance levels.
Installation Process
The ease of installation is another critical consideration when selecting a CPU cooler. The Noctua NH-L12S comes equipped with the SecuFirm2 mounting system, which simplifies the installation process across various Intel and AMD platforms, including LGA1700 and AM4. This thoughtful design ensures that users can efficiently install the cooler without hassle. In comparison, the Thermalright Peerless Assassin 120 SE Black provides a comprehensive mounting kit compatible with Intel LGA1150 through LGA1851 and AMD AM4/AM5 sockets. While both products aim for user-friendly installation, the Noctua’s streamlined setup may appeal more to those who prioritize simplicity.
Noise Levels
Noise levels are an essential aspect for users seeking a quieter computing experience. The Noctua NH-L12S is designed for ultra-quiet operation, aided by its PWM fan and Low-Noise Adaptor, though specific decibel ratings are not provided. This ensures that users can enjoy a silent operation, making it ideal for quiet environments. In contrast, the Thermalright Peerless Assassin 120 SE Black has a noise output rated at ≤25.6 dB(A) during operation, which is relatively quiet for a dual fan setup. While both coolers are engineered for low noise, the Noctua’s reputation for near-silent performance may give it an edge in noise-sensitive applications.
Compatibility
Compatibility is a vital factor when selecting a CPU cooler, especially for builds involving specific CPUs. The Noctua NH-L12S supports a wide range of Intel sockets, including LGA1851, LGA1700, and LGA1200, as well as AMD's AM4 and AM5 platforms. It is particularly noted for its offset mounting option, allowing for enhanced cooling efficiency. Conversely, the Thermalright Peerless Assassin 120 SE Black also supports a broad range of Intel and AMD sockets, with a focus on easier installation across various platforms. Both products offer compatibility, but the Noctua’s additional features may provide a slight advantage for those with particular needs.
Thermal Paste Quality
The quality of thermal paste included with a CPU cooler can impact thermal conductivity and overall cooling performance. The Noctua NH-L12S comes with high-end NT-H1 thermal paste, known for its excellent thermal performance. This inclusion is a significant advantage, particularly for users looking to achieve optimal heat transfer from CPU to cooler. The Thermalright Peerless Assassin 120 SE Black does not specify the type of thermal paste included, which may be a consideration for users who value high-quality thermal interface materials. The inclusion of premium thermal paste with the Noctua can enhance its overall value proposition.
Price Comparison
Price is a crucial deciding factor for many consumers. The Noctua NH-L12S retails at C$87.95, reflecting its premium design and features. In contrast, the Thermalright Peerless Assassin 120 SE Black is significantly more affordable at C$46.79, making it an attractive option for budget-conscious consumers. While the Noctua offers superior build quality and performance, the Thermalright delivers impressive value for its price. This difference in pricing may sway buyers towards the Thermalright if affordability is a priority.
Which should you buy?
Ultimately, the choice between the Noctua NH-L12S and the Thermalright Peerless Assassin 120 SE Black will depend on your specific needs and budget. If you require a compact, premium-quality cooler for an ITX build and prioritise low noise and ease of installation, the Noctua NH-L12S is a solid choice. However, if you are looking for an economical option that still offers robust cooling performance, the Thermalright Peerless Assassin 120 SE Black provides excellent value without compromising on essential features. Consider your requirements carefully to make the best choice for your setup.
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