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

Updated August 2026 — Noctua NH-L9x65 chromax.Black wins on design and noise level, Thermalright Peerless Assassin 120 Black CPU Air wins on cooling and performance.

The Thermalright Peerless Assassin 120 Black offers superior cooling performance and broader compatibility at a lower price, making it the better choice for high-performance needs.

Why Noctua NH-L9x65 chromax.Black is better

Compact Size

Ideal for small form factor builds

Quiet Operation

Designed for ultra-quiet performance

Easy Installation

SecuFirm2 mounting system for quick setup

Why Thermalright Peerless Assassin 120 Black CPU Air is better

Cooling Performance

Handles higher TDP of 245W

Price

Significantly cheaper at $38.90

Compatibility

Supports a wider range of CPU sockets

Overall score

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

Specifications

SpecNoctua NH-L9x65 chromax.BlackThermalright Peerless Assassin 120 Black CPU Air
TDPLow to Moderate245W
Fan Count12
Noise LevelLow25.6 dB(A)
Socket SupportLimitedBroad
Price$79.95$38.90

Dimension comparison

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

Overview

When comparing the Noctua NH-L9x65 chromax.Black and the Thermalright Peerless Assassin 120 Black, the most significant difference lies in their design and cooling capabilities. The Noctua is a premium low-profile cooler, while the Thermalright is a more robust air cooler designed for higher performance. This comparison will delve into their features, performance, design, and price to help you determine which cooler is best suited for your needs.

Cooling Performance

The Thermalright Peerless Assassin 120 Black offers superior cooling performance compared to the Noctua NH-L9x65 chromax.Black. With a total thermal design power (TDP) of 245W, it is designed to handle higher heat dissipation, making it suitable for more powerful CPUs. In contrast, the Noctua is recommended for CPUs with low to moderate heat dissipation, making it ideal for compact builds but less effective for high-performance setups. The inclusion of dual PWM fans in the Thermalright cooler enhances airflow, achieving a maximum air flow of 66.17 CFM, which contributes significantly to its effectiveness in cooling.

Design and Size

In terms of design, the Noctua NH-L9x65 chromax.Black is compact, with a total height of just 65mm, making it perfect for small form factor builds, such as HTPCs and ITX systems. Its slim profile allows it to stay clear of RAM or PCIe slots, which is a critical factor for tight spaces. Conversely, the Thermalright Peerless Assassin 120 Black measures 125mm x 135mm x 157mm, making it bulkier but providing a more robust cooling solution. The choice between them will largely depend on your build’s spatial constraints and aesthetic preferences, as the Noctua offers a sleek all-black design.

Installation Process

Both coolers are designed for easy installation, but they cater to different user preferences. The Noctua NH-L9x65 chromax.Black comes with the SecuFirm2 mounting system, ensuring an effortless setup on various Intel and AMD sockets, including LGA1700 and AM4. This feature is particularly beneficial for users who prioritize quick assembly and maintenance. On the other hand, the Thermalright Peerless Assassin 120 Black also supports a wide range of sockets and includes metal fasteners for enhanced stability. However, the larger size may require more careful handling during installation compared to the compact Noctua.

Noise Levels

When it comes to operational noise, the Noctua NH-L9x65 chromax.Black is designed for ultra-quiet operation, thanks to its highly optimized NF-A9x14 slim fan that operates with minimal noise. This makes it an excellent choice for users who prioritize a silent computing experience. The Thermalright Peerless Assassin 120 Black, while equipped with dual fans, has a reported noise level of up to 25.6 dB(A). Although this is still relatively quiet, it may not match the low noise profile of the Noctua, especially under load.

Compatibility

Compatibility is another factor where these two products differ significantly. The Noctua NH-L9x65 chromax.Black is recommended for CPUs with low to moderate heat dissipation, such as specific Intel and AMD models. This makes it a good fit for users with less demanding processing needs. In contrast, the Thermalright Peerless Assassin 120 Black is compatible with a broader range of Intel and AMD sockets, including high-end options. This versatility makes it suitable for users looking to invest in a cooler that can support future CPU upgrades or those with high-performance needs.

Price Comparison

Price is a crucial consideration when selecting a CPU cooler. The Noctua NH-L9x65 chromax.Black is priced at $79.95, while the Thermalright Peerless Assassin 120 Black is available for just $38.90. This makes the Thermalright about 51% cheaper than the Noctua, making it a more attractive option for budget-conscious consumers. However, the price difference also reflects their respective cooling capabilities and design features, which should be carefully considered based on individual needs and preferences.

User Preferences

Ultimately, the choice between the Noctua NH-L9x65 chromax.Black and the Thermalright Peerless Assassin 120 Black may come down to personal preferences and specific use cases. Users building compact systems with moderate heat output may find the Noctua to be the perfect fit due to its low-profile design and quiet operation. Conversely, those looking for superior cooling performance for high-end CPUs or gaming systems might lean towards the Thermalright, given its robust cooling capabilities and broader compatibility with various socket types.

Which should you buy?

In conclusion, choosing between the Noctua NH-L9x65 chromax.Black and the Thermalright Peerless Assassin 120 Black depends largely on your specific needs. If you require a compact, quiet solution for a small form factor build, the Noctua is the way to go. However, if you prioritize cooling performance and compatibility with high-end CPUs, the Thermalright offers exceptional value at a significantly lower price. Ultimately, assessing your cooling requirements and build constraints will lead you to the right decision for your setup.