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Noctua NH-L9x65 chromax.Black vs Thermalright Peerless Assassin 120 SE Black CPU Cooler

Updated August 2026The Thermalright Peerless Assassin 120 SE Black offers superior cooling performance at a more affordable price, making it the better choice for most users.

The Thermalright Peerless Assassin 120 SE Black offers superior cooling performance at a more affordable price, making it the better choice for most users.

Why Noctua NH-L9x65 chromax.Black is better

Compact Design

Ideal for small form factor builds.

Low Noise

Designed for quieter operation.

Quality Materials

High-quality construction with premium thermal paste.

Why Thermalright Peerless Assassin 120 SE Black CPU Cooler is better

Cooling Performance

Dual tower and dual fan system for better heat dissipation.

Price

More budget-friendly option.

Airflow

Higher maximum airflow of 66.17 CFM.

Overall score

Noctua NH-L9x65 chromax.Black
75
Thermalright Peerless Assassin 120 SE Black CPU Cooler
88

Specifications

SpecNoctua NH-L9x65 chromax.BlackThermalright Peerless Assassin 120 SE Black CPU Cooler
PriceC$101.95C$46.79
Fan Count12
Noise LevelLow25.6 dB(A)
CompatibilityIntel/AMDIntel/AMD
Cooling TypeLow-profileDual tower

Dimension comparison

Noctua NH-L9x65 chromax.BlackThermalright Peerless Assassin 120 SE Black CPU Cooler

Price Comparison

When it comes to price, the Thermalright Peerless Assassin 120 SE Black is significantly more affordable than the Noctua NH-L9x65 chromax.Black. Priced at C$46.79, the Peerless Assassin is a budget-friendly option, making it accessible for those who want effective cooling without breaking the bank. In contrast, the Noctua model retails for C$101.95, positioning it in the higher price range. This price difference of C$55.16 reflects the varying features and cooling capabilities of both products.

Design and Aesthetics

In terms of design, the Noctua NH-L9x65 chromax.Black offers a compact low-profile design that is ideal for small form factor builds, making it perfect for HTPCs or ITX cases. Its overall height of only 65mm allows it to fit seamlessly in tighter spaces. On the other hand, the Thermalright Peerless Assassin 120 SE Black features a larger double tower design with a height of 155mm, which is more suited for bigger cases. This design choice allows for better cooling efficiency but may limit compatibility with smaller builds.

Cooling Performance

Cooling performance is a crucial aspect to consider, and the Thermalright Peerless Assassin 120 SE Black excels in this area. It features a dual tower and dual fan system, which allows for enhanced airflow and heat dissipation. The PWM fans can reach a maximum airflow of 66.17 CFM while maintaining a noise level of just 25.6 dB(A). In contrast, the Noctua NH-L9x65 utilises a single slim 92mm fan designed for quieter operation, optimised for low to moderate heat dissipation. While the Noctua is effective in its own right, the Peerless Assassin provides a more robust cooling solution for higher-performance CPUs.

Installation and Compatibility

When it comes to installation and compatibility, both coolers offer user-friendly features. The Noctua NH-L9x65 is equipped with the SecuFirm2 mounting system, which allows for easy installation on a variety of Intel and AMD sockets, including the latest LGA1700 and AM5. Similarly, the Thermalright Peerless Assassin 120 SE Black includes a comprehensive mounting kit compatible with numerous Intel and AMD CPU sockets, ensuring a broad range of compatibility. However, the Noctua's compact design might make it easier to install in cramped conditions compared to the larger Thermalright model.

Noise Levels

Noise levels are a critical factor for many users, especially those building quiet systems. The Noctua NH-L9x65 chromax.Black is specifically designed for low-noise operation, utilising a slim fan that operates quietly, particularly under low to moderate workloads. While the Thermalright Peerless Assassin 120 SE Black also has a relatively low noise level of 25.6 dB(A), its dual fans may generate slightly more noise during peak operation. If absolute silence is your priority, the Noctua could be the better choice.

Build Quality and Materials

Build quality is another area where both products shine, although they take different approaches. The Noctua NH-L9x65 is made with high-quality materials and comes with premium NT-H1 thermal paste, ensuring optimal thermal conductivity. Its compact design also means that it is built to last, especially in smaller builds. Conversely, the Thermalright Peerless Assassin 120 SE Black boasts an all-aluminium construction with a fine micro-carved copper bottom, which enhances heat dissipation. Both coolers reflect a commitment to quality, but the materials used in the Thermalright may offer better thermal performance due to its larger size and dual fan setup.

Target Audience

The target audience for each cooler varies significantly. The Noctua NH-L9x65 chromax.Black is aimed at users with HTPCs or compact builds who prioritise space and noise reduction. It is recommended for CPUs with low to moderate heat dissipation, making it ideal for casual gamers or office PCs. In contrast, the Thermalright Peerless Assassin 120 SE Black targets enthusiasts and gamers looking for high-performance cooling solutions. Its robust design and superior airflow capabilities make it suitable for overclocking and intensive tasks.

Which should you buy?

Choosing between the Noctua NH-L9x65 chromax.Black and the Thermalright Peerless Assassin 120 SE Black ultimately depends on your specific needs and build requirements. If you are looking for a compact, quiet cooler for a small form factor build, the Noctua is the better choice, despite its higher price of C$101.95. However, for those seeking superior cooling performance at a more affordable price of C$46.79, the Thermalright Peerless Assassin 120 SE Black stands out with its dual fan design and greater heat dissipation capabilities.

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Noctua NH-L9x65 chromax.Black vs Thermalright Peerless Assassin 120 SE Black CPU Cooler | versusfinder