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Noctua NH-L12S vs Thermalright Assassin X 120 SE ARGB CPU Air Cooler

Updated August 2026The Noctua NH-L12S excels in quiet operation and build quality, while the Thermalright Assassin X 120 SE offers great value for budget-conscious users.

The Noctua NH-L12S excels in quiet operation and build quality, while the Thermalright Assassin X 120 SE offers great value for budget-conscious users.

Why Noctua NH-L12S is better

Cooling Performance

Handles moderate heat loads effectively.

Noise Levels

Renowned for ultra-quiet operation.

Build Quality

Premium materials and design.

Why Thermalright Assassin X 120 SE ARGB CPU Air Cooler is better

Price

Significantly more affordable.

TDP Handling

Can handle higher TDPs.

Aesthetics

Includes customizable ARGB lighting.

Overall score

Noctua NH-L12S
85
Thermalright Assassin X 120 SE ARGB CPU Air Cooler
65

Specifications

SpecNoctua NH-L12SThermalright Assassin X 120 SE ARGB CPU Air Cooler
PriceC$87.95C$24.29
Socket SupportLGA1851, LGA1700, AM5115X, 1200, AM4
Max TDPModerate125-225W
Noise LevelUltra-quiet25.6 dB(A)
Fan TypePWMPWM

Dimension comparison

Noctua NH-L12SThermalright Assassin X 120 SE ARGB CPU Air Cooler

Price Comparison

When it comes to price, the Thermalright Assassin X 120 SE ARGB CPU Air Cooler is significantly more affordable than the Noctua NH-L12S. The Thermalright is priced at C$24.29, while the Noctua comes in at C$87.95. This means that the Noctua is over three times more expensive than the Thermalright. For budget-conscious consumers or those looking for a cost-effective solution for their cooling needs, the Thermalright offers a very compelling option without sacrificing too much in terms of performance.

Design and Build Quality

In terms of design and build quality, both coolers showcase distinct characteristics. The Noctua NH-L12S is a compact, low-profile cooler with a total height of 70mm, making it ideal for ITX and HTPC systems. It is known for its premium quality and includes a high-end NT-H1 thermal paste for optimal thermal transfer. On the other hand, the Thermalright Assassin X 120 SE ARGB has a larger footprint, measuring 125mm in length, 71mm in width, and 148mm in height. Despite being bulkier, it is designed using aluminum and features a PWM fan with a maximum airflow of 66.17 CFM, ensuring efficient cooling.

Cooling Performance

Cooling performance is a critical factor for CPU coolers, and both models offer capabilities that cater to different needs. The Noctua NH-L12S is designed for CPUs with moderate heat loads, effectively handling processors like the AMD Ryzen 7950X3D and Intel 285K. It includes a highly optimised NF-A12x15 120mm fan for ultra-quiet operation thanks to its Low-Noise Adaptor. Meanwhile, the Thermalright Assassin X 120 SE can handle a thermal design power (TDP) of 125 to 225W, making it suitable for a broader range of CPUs, including those with higher heat outputs. This versatility gives the Thermalright an edge in scenarios demanding greater cooling capacity.

Noise Levels

Noise levels are an important consideration for users who seek a quiet computing environment. The Noctua NH-L12S is renowned for its ultra-quiet operation, making it a great choice for noise-sensitive builds. Although specific noise level measurements for the Noctua are not provided, its design emphasises low-noise performance. In contrast, the Thermalright Assassin X 120 SE has a maximum noise level of 25.6 dB(A), which is relatively quiet but does not match the Noctua’s reputation for silence. For users prioritising a quiet system, the Noctua may be the better choice.

Compatibility

When it comes to compatibility, both coolers offer a range of socket support for various Intel and AMD platforms. The Noctua NH-L12S is compatible with Intel LGA1851, LGA1700, LGA1200, and LGA115x sockets, as well as AMD AM5 and AM4. It also features an offset mounting option for enhanced efficiency. The Thermalright Assassin X 120 SE supports Intel sockets 115X, 1200, and 1700, alongside AMD AM4. While both coolers cover essential socket types, the Noctua has a broader compatibility range, making it suitable for more varied builds.

Installation Process

The installation process can greatly affect user experience, and here both models offer easy installation methods. The Noctua NH-L12S includes the SecuFirm2 mounting system, designed for straightforward installation on various Intel and AMD sockets. This system is tailored for users who might not be as experienced in CPU cooler installation. Similarly, the Thermalright Assassin X 120 SE comes equipped with metal fasteners for both Intel and AMD platforms, facilitating a simple setup. Both coolers are user-friendly, but the Noctua's dedicated mounting system may offer a slight advantage in terms of ease of use.

Aesthetics

Aesthetics may not be the primary concern for all users, but it can influence purchasing decisions. The Noctua NH-L12S features a clean, professional design typical of Noctua's branding, appealing to those who appreciate a minimalist look. In contrast, the Thermalright Assassin X 120 SE includes ARGB lighting, appealing to gamers and users who prefer a more vibrant and customizable appearance. Depending on personal preference, users may gravitate towards the understated elegance of the Noctua or the flashy aesthetics of the Thermalright.

Which should you buy?

Ultimately, the decision between the Noctua NH-L12S and the Thermalright Assassin X 120 SE comes down to your specific needs and budget. If you are looking for a premium, low-profile cooler that excels in quiet operation and offers broad compatibility with a focus on moderate heat loads, the Noctua NH-L12S is the clear choice, albeit at a higher price of C$87.95. However, if you are on a budget and require a cooler that can handle higher TDPs while still providing decent performance, the Thermalright Assassin X 120 SE at C$24.29 is a fantastic option. Each cooler has its strengths, catering to different segments of users in the PC building community.

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Noctua NH-L12S vs Thermalright Assassin X 120 SE ARGB CPU Air Cooler | versusfinder