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Thermalright Peerless Assassin 120 Digital ARGB Black CPU Cooler Air with 6X6mm vs Noctua NH-L9x65 chromax.Black

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

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

Why Thermalright Peerless Assassin 120 Digital ARGB Black CPU Cooler Air with 6X6mm is better

Cooling Performance

Higher airflow and dual-tower design for better heat dissipation.

Price

More affordable at C$62.90 compared to C$101.95.

Cooling Technology

Utilizes advanced cooling technology with six copper heat pipes.

Why Noctua NH-L9x65 chromax.Black is better

Compact Size

Only 65mm tall, ideal for small builds.

Noise Levels

Designed for ultra-quiet operation.

Installation Ease

Includes SecuFirm2 mounting system for easy setup.

Overall score

Thermalright Peerless Assassin 120 Digital ARGB Black CPU Cooler Air with 6X6mm
85
Noctua NH-L9x65 chromax.Black
75

Specifications

SpecThermalright Peerless Assassin 120 Digital ARGB Black CPU Cooler Air with 6X6mm Noctua NH-L9x65 chromax.Black
Max RPM1850NA
Airflow (CFM)88.89NA
Noise Level (dB)25.6NA
Socket CompatibilityVariousIntel/AMD
Thermal PasteNANT-H1

Dimension comparison

Thermalright Peerless Assassin 120 Digital ARGB Black CPU Cooler Air with 6X6mm Noctua NH-L9x65 chromax.Black

Overview of Thermalright Peerless Assassin 120 Digital ARGB Black and Noctua NH-L9x65 chromax.Black

The Thermalright Peerless Assassin 120 Digital ARGB Black is a powerful CPU cooler priced at C$62.90, while the Noctua NH-L9x65 chromax.Black is a compact option available for C$101.95. The significant difference in price reflects their distinct design philosophies and intended use cases. The Thermalright model is designed for high-performance cooling, whereas the Noctua cooler caters to low-profile builds, making it suitable for specific setups like HTPCs and small form factors.

Cooling Performance

The Thermalright Peerless Assassin 120 excels in cooling performance, featuring a dual-tower design equipped with dual fans that can reach a speed of 1850 RPM, generating an impressive airflow of 88.89 CFM. This configuration is ideal for dissipating heat effectively, making it suitable for CPUs with high thermal output. In contrast, the Noctua NH-L9x65, while effective in its own right, is designed for low to moderate heat dissipation, making it a better choice for CPUs that do not require extreme cooling solutions. The optimized NF-A9x14 slim 92mm fan operates quietly, but its lower capacity compared to the Thermalright model may limit its effectiveness under heavy loads.

Size and Compatibility

When it comes to size, the Noctua NH-L9x65 stands out with its compact height of just 65mm, allowing it to fit easily in cramped cases without obstructing RAM or PCIe slots. This makes it particularly suitable for ITX and small form factor builds. The Thermalright Peerless Assassin 120, on the other hand, has a larger overall height of 162mm, which may limit its compatibility with certain cases, particularly smaller ones. Users should consider their build's dimensions when choosing between these two coolers, as the Thermalright requires a more spacious chassis.

Noise Levels

Noise levels are a crucial consideration for many PC builders. The Thermalright Peerless Assassin 120 operates at a maximum noise level of 25.6 dB(A), which is relatively quiet for a cooler of its size and performance capabilities. The Noctua NH-L9x65, with its low-noise adapter and PWM support, is designed for ultra-quiet operation, though specific noise levels are not provided. Given its focus on low-profile cooling, the Noctua model is engineered to maintain a silent operation, which may be preferable for users prioritizing a noise-free environment.

Installation Ease

Ease of installation is a notable feature of the Noctua NH-L9x65, which comes with a SecuFirm2 mounting system compatible with a wide range of Intel and AMD sockets, ensuring a straightforward setup process. Additionally, it includes high-end NT-H1 thermal paste, enhancing the user experience. In contrast, while the Thermalright Peerless Assassin 120 also offers a user-friendly installation process, detailed documentation on its mounting system is not specified. Users should ensure compatibility with their motherboard types to avoid installation issues.

Cooling Technology

The Thermalright Peerless Assassin 120 employs advanced cooling technology with six pure copper heat pipes and a dual-tower structure, which enables efficient heat transfer and dissipation. It also features S-FDB bearings in its fans, contributing to a longer lifespan and reducing potential failures. The Noctua NH-L9x65 utilises a highly optimised slim fan design, specifically crafted for low-profile applications, but it may not achieve the same level of thermal performance as the Thermalright cooler under heavy loads. The choice of cooling technology is essential, especially for users with high-performance CPUs.

Aesthetic Appeal

The aesthetic design of the Thermalright Peerless Assassin 120 includes a digital display board on the magnetic top cover, adding a modern touch that may appeal to gamers and tech enthusiasts. Its overall black style complements a variety of builds, making it visually appealing. On the other hand, the Noctua NH-L9x65 chromax.Black offers a sleek all-black design that fits well in minimalist setups. While both coolers are visually attractive, the choice largely depends on personal preference and the specific look a user wants to achieve in their build.

Which should you buy?

Choosing between the Thermalright Peerless Assassin 120 Digital ARGB Black and the Noctua NH-L9x65 chromax.Black comes down to specific needs and use cases. If you're building a high-performance gaming rig with a powerful CPU that generates significant heat, the Thermalright cooler, with its superior cooling performance and lower price of C$62.90, is the clear winner. However, if you're constructing a compact, low-profile build where space is at a premium, the Noctua NH-L9x65, although more expensive at C$101.95, may be the better option due to its compact design and quieter operation. Ultimately, both models have their strengths, and your choice should align with your specific requirements and build type.

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Thermalright Peerless Assassin 120 Digital ARGB Black CPU Cooler Air with 6X6mm vs Noctua NH-L9x65 chromax.Black | versusfinder