Thermalright Peerless Assassin 120 SE CPU Cooler vs Noctua NH-D9L
Updated August 2026 — The Thermalright Peerless Assassin 120 SE offers excellent value for budget-conscious consumers, while the Noctua NH-D9L excels in compact design and quiet operation.
The Thermalright Peerless Assassin 120 SE offers excellent value for budget-conscious consumers, while the Noctua NH-D9L excels in compact design and quiet operation.
Why Thermalright Peerless Assassin 120 SE CPU Cooler is better
price
Thermalright is C$21.05 cheaper
aesthetics
Thermalright features ARGB lighting
brand experience
Thermalright has over 20 years in cooling
Why Noctua NH-D9L is better
size
Noctua is more compact at 110mm height
noise levels
Noctua is optimized for ultra-quiet operation
installation
Noctua's SecuFirm2 system is user-friendly
Overall score
Specifications
| Spec | Thermalright Peerless Assassin 120 SE CPU Cooler | Noctua NH-D9L |
|---|---|---|
| Cooling Performance | Good | Excellent |
| Noise Level | 25.6 dB(A) | Ultra-quiet |
| Compatibility | Wide | Very Wide |
| Warranty | N/A | 6 years |
| Fan Type | ARGB | 92mm PWM |
Dimension comparison
Price Comparison
When considering price, the Thermalright Peerless Assassin 120 SE CPU Cooler is significantly more affordable at C$48.90 compared to the Noctua NH-D9L, which retails for C$69.95. This represents a difference of C$21.05, making Thermalright an attractive option for budget-conscious consumers. The price difference may influence buyers who are looking for effective cooling solutions without a hefty price tag. Both coolers target similar markets, but the Thermalright model offers a compelling value proposition for those who want solid performance without breaking the bank.
Cooling Performance
In terms of cooling capability, the Thermalright Peerless Assassin 120 SE boasts a dual tower heatsink design with six 6mm heat pipes, which enhances its heat dissipation abilities. Its two high-performance ARGB fans can achieve a maximum airflow of 66.17 CFM while operating at a maximum noise level of 25.6 dB(A). Conversely, the Noctua NH-D9L is designed with a compact dual-tower configuration and features a 92mm fan optimised for low noise levels and effective cooling. While it does not provide specific airflow metrics, its design is tailored for efficient cooling in small form factors.
Size and Compatibility
The size and compatibility of a CPU cooler are crucial for ensuring it fits within your PC case. The Thermalright Peerless Assassin 120 SE measures 125mm x 135mm x 155mm, making it a relatively large option that requires careful consideration of your case dimensions. It supports a wide range of Intel and AMD sockets, including LGA1700 and AM5, though it requires the original motherboard backplate for installation. On the other hand, the Noctua NH-D9L is significantly shorter at just 110mm, which makes it ideal for compact builds like HTPCs and ITX setups. Its design avoids overhanging RAM or PCIe slots, which is a crucial advantage in smaller systems.
Noise Levels
Noise levels are an important consideration for users who prioritise quiet operation. The Thermalright Peerless Assassin 120 SE operates at a maximum noise level of 25.6 dB(A), which is relatively quiet for a CPU cooler with two fans. The Noctua NH-D9L, while lacking specific dB ratings, is renowned for its ultra-quiet operation due to its highly optimised NF-A9 fan and the inclusion of a Low-Noise Adaptor. Users can expect a quieter performance thanks to its automatic speed control, making the Noctua model potentially better suited for environments where silence is paramount.
Installation Process
When it comes to installation, both coolers offer straightforward mounting systems. The Thermalright Peerless Assassin 120 SE features an SS2 install system and comes with a metal pressure plate, ensuring good contact with the CPU. However, it requires using the motherboard's built-in backplate for AM4 and AM5 installations, which could complicate setup for some users. The Noctua NH-D9L includes the SecuFirm2 mounting system, which is praised for its ease of use and reliability across multiple socket types, including LGA1851 and AM5. This may make the Noctua a more user-friendly choice for those less experienced with CPU cooler installations.
Aesthetics
Aesthetics can play a significant role in a buyer's decision, especially for those who want their PC components to match their overall design. The Thermalright Peerless Assassin 120 SE features colourful ARGB lighting effects, appealing to users who enjoy customisable lighting options. Its dual fans enhance the visual appeal while maintaining a functional design. In contrast, the Noctua NH-D9L is known for its classic brown-and-beige colour scheme, which may not appeal to everyone but is often considered a hallmark of premium quality and reliability. Users looking for style may prefer the Thermalright model, while those prioritising classic design may lean towards Noctua.
Brand Reputation
Brand reputation can significantly influence purchasing decisions. Thermalright has over 20 years of experience in the cooling industry and is known for producing high-performance heatsinks and accessories. This experience lends credibility to the Peerless Assassin 120 SE, particularly among gamers and PC builders. Noctua, on the other hand, is highly regarded for its exceptional quality and performance, often backed by a 6-year manufacturer’s warranty. Users frequently cite Noctua products for their reliability and longevity, making it a trusted choice for high-end builds.
Which should you buy?
Choosing between the Thermalright Peerless Assassin 120 SE and the Noctua NH-D9L depends on your specific needs and preferences. If you are looking for a budget-friendly option with vibrant aesthetics and solid cooling performance, the Thermalright model is a great choice at C$48.90. However, if you prioritise a compact design, ultra-quiet operation, and reliable brand reputation, the Noctua NH-D9L at C$69.95 may be worth the investment. Ultimately, both coolers offer unique advantages, making them suitable for different types of users and builds.
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