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Thermalright Peerless Assassin 120 SE V2 CPU Cooler vs Noctua NH-L9x65 chromax.Black

Updated August 2026The Thermalright Peerless Assassin 120 SE V2 offers superior cooling performance at a lower price, making it the better choice for high-performance builds. The Noctua NH-L9x65 chromax.Black excels in compactness and quiet operation for small form factor systems.

The Thermalright Peerless Assassin 120 SE V2 offers superior cooling performance at a lower price, making it the better choice for high-performance builds. The Noctua NH-L9x65 chromax.Black excels in compactness and quiet operation for small form factor systems.

Why Thermalright Peerless Assassin 120 SE V2 CPU Cooler is better

Cooling Performance

Higher TDP rating of 265 watts

Price

Lower price at C$54.90

Airflow

Higher airflow of 88.19 CFM

Why Noctua NH-L9x65 chromax.Black is better

Size

Compact height of 65mm

Noise Level

Quieter operation with low-noise adaptor

Aesthetic Appeal

All-black design for modern builds

Overall score

Thermalright Peerless Assassin 120 SE V2 CPU Cooler
85
Noctua NH-L9x65 chromax.Black
75

Specifications

SpecThermalright Peerless Assassin 120 SE V2 CPU CoolerNoctua NH-L9x65 chromax.Black
TDP265WModerate
Airflow88.19 CFMNot specified
Noise Level29.5 dB(A)Ultra-quiet
CompatibilityIntel LGA 1851/1700/1200/115X, AMD AM4/AM5Intel LGA 1851/1700/1200/115X, AMD AM4/AM5
Fan TypeDual PWMSingle PWM

Dimension comparison

Thermalright Peerless Assassin 120 SE V2 CPU CoolerNoctua NH-L9x65 chromax.Black

Overview of the Thermalright Peerless Assassin 120 SE V2 and Noctua NH-L9x65 chromax.Black

The Thermalright Peerless Assassin 120 SE V2 is priced at C$54.90, while the Noctua NH-L9x65 chromax.Black costs C$101.95. The significant price difference reflects their design intentions and target use cases. The Thermalright offers a more robust cooling solution, while the Noctua is designed for compact builds, making each cooler suited for different needs.

The Thermalright Peerless Assassin 120 SE V2 stands out with its dual thickened PWM fans, and advanced AGHP GEN 5.0 technology, which helps manage heat better. In contrast, the Noctua NH-L9x65 chromax.Black is a low-profile cooler ideal for small form factor builds, emphasising quiet operation and space efficiency.

Design and Dimensions

The Thermalright Peerless Assassin 120 SE V2 measures 125mm x 135mm x 155mm, making it a sizeable cooler that provides considerable cooling potential. Its larger footprint allows for more extensive heat dissipation, which is crucial for high-performance CPUs. The cooler's design is complemented by six 6mm heat pipes, enhancing its cooling efficiency.

On the other hand, the Noctua NH-L9x65 chromax.Black boasts a compact height of only 65mm, making it ideal for HTPCs and ITX builds where space is limited. Its 95mm x 95mm footprint ensures it does not obstruct RAM or PCIe slots, facilitating easier installation and maintenance. This design prioritises compatibility and convenience over sheer cooling power.

Cooling Performance

The Thermalright Peerless Assassin 120 SE V2 excels in cooling performance with a thermal design power (TDP) rating of up to 265 watts. This capability makes it suitable for overclocked systems and high-end CPUs requiring robust cooling solutions. The dual fans provide an airflow of 88.19 CFM at a noise level of 29.5 dB(A), ensuring efficient heat management while maintaining relatively low noise levels.

In contrast, the Noctua NH-L9x65 chromax.Black is tailored for CPUs with low to moderate heat dissipation, making it more suitable for standard builds rather than high-performance or overclocked setups. While it features an optimised NF-A9x14 slim fan for quiet operation, it lacks the airflow capabilities of the Thermalright, focusing instead on functionality in compact environments.

Installation and Compatibility

The Thermalright Peerless Assassin 120 SE V2 is compatible with a wide range of CPU sockets, including Intel LGA 1851, 1700, 1200, and 115X, as well as AMD's AM4 and AM5 platforms. It comes with the necessary metal fasteners and mounting plates, simplifying installation for users on both major platforms.

Similarly, the Noctua NH-L9x65 chromax.Black supports a variety of Intel and AMD sockets, including LGA 1851, 1700, 1200, 115X, AM5, and AM4. It includes the SecuFirm2 mounting system, which is easy to install and ensures a secure fit. However, the Thermalright's larger size may pose challenges in cramped cases, while the Noctua is specifically designed for ease of installation in tight spaces.

Noise Levels

The Thermalright Peerless Assassin 120 SE V2 operates at a maximum noise level of 29.5 dB(A), which is relatively quiet for a cooler of its size and performance capabilities. Its dual fans work efficiently to balance airflow and noise, making it suitable for both gaming and standard uses without being overly intrusive.

In contrast, the Noctua NH-L9x65 chromax.Black is engineered for ultra-quiet operation, particularly in small form factor builds. Its low-noise adaptor further enhances this feature, allowing it to run at reduced speeds when full cooling capacity isn’t necessary. This makes it an excellent choice for users prioritising a silent computing experience.

Aesthetic Appeal

The Thermalright Peerless Assassin 120 SE V2 features a utilitarian design typical of high-performance coolers with a focus on function over aesthetics. Its robust build and metallic finish convey durability, although it may not have the sleek appearance that some users desire.

By contrast, the Noctua NH-L9x65 chromax.Black is available in an all-black design, appealing to users who prefer a modern, minimalist look in their builds. This aesthetic versatility allows it to blend seamlessly with various build themes, especially in compact setups where visual appeal is paramount.

Price Comparison

With a price of C$54.90, the Thermalright Peerless Assassin 120 SE V2 offers excellent value for users needing high-performance cooling without breaking the bank. Its robust features and capabilities justify its price point, particularly for gamers and content creators.

In comparison, the Noctua NH-L9x65 chromax.Black, at C$101.95, represents a premium for its compact design and quiet operation. While it may not provide the same level of cooling performance as the Thermalright, its design caters to a niche market that prioritises quietness and space efficiency over raw cooling power.

Which should you buy?

Choosing between the Thermalright Peerless Assassin 120 SE V2 and the Noctua NH-L9x65 chromax.Black boils down to your specific needs. If you require a powerful cooler capable of handling high-performance CPUs and overclocking, the Thermalright is the clear choice with its superior cooling capacity and lower price. However, if you are building a compact, quiet system and value aesthetics, the Noctua is worth the investment for its low-profile design and silent operation.

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Thermalright Peerless Assassin 120 SE V2 CPU Cooler vs Noctua NH-L9x65 chromax.Black | versusfinder