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Thermalright Assassin X 120 SE ARGB CPU Air Cooler vs Noctua NH-U9S

Updated August 2026The Thermalright Assassin X 120 SE offers excellent value with strong performance and wider compatibility at a lower price, while the Noctua NH-U9S excels in compact design and quiet operation.

The Thermalright Assassin X 120 SE offers excellent value with strong performance and wider compatibility at a lower price, while the Noctua NH-U9S excels in compact design and quiet operation.

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

price

C$24.29 vs C$74.95

TDP

125 to 225W vs unspecified

compatibility

supports more Intel and AMD sockets

Why Noctua NH-U9S is better

thermal paste

includes high-end NT-H1 thermal paste

design

compact single-tower design

installation

user-friendly SecuFirm2 mounting system

Overall score

Thermalright Assassin X 120 SE ARGB CPU Air Cooler
85
Noctua NH-U9S
75

Specifications

SpecThermalright Assassin X 120 SE ARGB CPU Air CoolerNoctua NH-U9S
Cooling PerformanceTDP 125-225WNot specified
Noise Level≤25.6 dB(A)Not specified
Socket SupportIntel 115X/1200/1700/AM4Intel LGA1851/1700/1200/115x, AMD AM4/AM5
Fan Speed1550 RPMNot specified
MaterialAluminumNot specified

Dimension comparison

Thermalright Assassin X 120 SE ARGB CPU Air CoolerNoctua NH-U9S

Introduction to CPU Coolers

When it comes to cooling your CPU, selecting the right cooler can significantly impact your system's performance and noise levels. In this comparison, we will examine the Thermalright Assassin X 120 SE ARGB CPU Air Cooler and the Noctua NH-U9S, two popular options in the CPU cooling market. The Thermalright cooler is priced at C$24.29, while the Noctua model is considerably higher at C$74.95. This price difference prompts an evaluation of their features, performance, and overall value.

Design and Build Quality

The design of a CPU cooler can affect not just aesthetics but also compatibility with various builds. The Thermalright Assassin X 120 SE features a compact design with dimensions of 125mm in length, 71mm in width, and 148mm in height, making it suitable for medium-sized cases. Its aluminum heat sink and metal fasteners promise durability and efficient heat dissipation. In contrast, the Noctua NH-U9S boasts a compact single-tower design, standing at only 125mm high, which is ideal for HTPCs and small form factor builds. It does not overhang RAM or PCIe slots, ensuring compatibility with most current motherboards. Both models exhibit strong build quality, but the Noctua's design prioritises space-saving features.

Cooling Performance

Cooling performance is crucial for maintaining optimal CPU temperatures, particularly during intense gaming or computing tasks. The Thermalright Assassin X 120 SE has a TDP (Thermal Design Power) rating between 125 to 225W, supported by its four 6mm heat pipes and a maximum airflow of 66.17 CFM from its 120mm PWM fan. This allows it to handle a wide range of CPUs effectively. On the other hand, the Noctua NH-U9S, equipped with a 92mm fan, provides highly optimised cooling with PWM support and a low-noise adaptor, although its TDP support is not specified. While both coolers offer strong performance, the Thermalright cooler has a higher TDP rating, making it potentially more effective for high-performance CPUs.

Noise Levels

Noise levels are an important consideration for users who prefer a quiet computing environment. The Thermalright Assassin X 120 SE operates at a noise level of up to 25.6 dB(A), which is relatively quiet for a cooler of its performance capability. The Noctua NH-U9S is designed for ultra-quiet operation, thanks to its advanced NF-A9 fan and low-noise adaptor, although specific noise levels are not provided. Both coolers are engineered to minimise noise; however, the Thermalright's specified dB level offers a clearer expectation of its acoustic performance.

Compatibility

Compatibility with different CPU sockets can determine a cooler's versatility across various systems. The Thermalright Assassin X 120 SE supports Intel sockets 115X, 1200, 1700, and AMD AM4, providing a wide range of compatibility for modern processors. The Noctua NH-U9S also boasts compatibility with numerous Intel and AMD sockets, including LGA1851, LGA1700, LGA1200, LGA115x, and AMD AM4 and AM5. Both coolers include mounting systems for easy installation, but the Thermalright's wider range of supported sockets may make it a more flexible choice for users with different CPU brands.

Installation Process

An easy installation process can save time and frustration when setting up a CPU cooler. The Thermalright Assassin X 120 SE includes metal fasteners designed for straightforward installation on both Intel and AMD platforms. Meanwhile, the Noctua NH-U9S is equipped with the SecuFirm2 mounting system, which is known for its user-friendly design and reliability. Both coolers promise a hassle-free installation experience, but Noctua's reputation for ease of installation might give it an edge for users new to building or upgrading PCs.

Thermal Paste Quality

The thermal paste used in CPU cooling solutions can affect thermal conductivity and overall cooling efficiency. The Thermalright Assassin X 120 SE does not specify the thermal paste included, which leaves an unknown factor regarding its thermal performance. In contrast, the Noctua NH-U9S comes with high-end NT-H1 thermal paste, which is well-regarded in the industry for its quality and performance. This inclusion may provide a slight advantage for the Noctua, as the thermal paste can significantly impact temperature management, particularly in high-performance scenarios.

Price Comparison

Price often plays a crucial role in the decision-making process for consumers. The Thermalright Assassin X 120 SE is priced at C$24.29, making it a more budget-friendly option, especially for those looking for efficient cooling without breaking the bank. In contrast, the Noctua NH-U9S is priced at C$74.95, which reflects its premium build quality and features. While the Noctua cooler offers renowned quality and performance, the significant price difference means that budget-conscious consumers may find the Thermalright a more appealing choice.

Which should you buy?

When deciding between the Thermalright Assassin X 120 SE and the Noctua NH-U9S, consider your specific needs and budget. The Thermalright cooler offers strong performance, wider compatibility, and a lower price, making it an excellent choice for value-seekers. On the other hand, the Noctua NH-U9S excels in compact design, ease of installation, and includes high-quality thermal paste, making it a top choice for users who prioritise quality and quiet operation. Ultimately, your choice will depend on whether you value performance and budget or premium features and quiet operation more highly.

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Thermalright Assassin X 120 SE ARGB CPU Air Cooler vs Noctua NH-U9S | versusfinder