Noctua NH-L9i-17xx vs Thermalright Assassin King 120 SE ARGB CPU Air Cooler
Updated August 2026 — The Noctua NH-L9i-17xx excels in silent operation and compact design, while the Thermalright Assassin King 120 SE ARGB offers better value and aesthetics. Choose based on your specific needs.
The Noctua NH-L9i-17xx excels in silent operation and compact design, while the Thermalright Assassin King 120 SE ARGB offers better value and aesthetics. Choose based on your specific needs.
Why Noctua NH-L9i-17xx is better
Cooling Performance
Noctua is designed for moderate heat loads with proven technology.
Noise Levels
Noctua operates nearly silently, ideal for quiet environments.
Build Quality
Noctua has a reputation for premium quality and durability.
Why Thermalright Assassin King 120 SE ARGB CPU Air Cooler is better
Price
Thermalright is significantly cheaper, appealing to budget users.
Aesthetics
Thermalright features vibrant ARGB lighting for visual appeal.
TDP Range
Thermalright supports a wider TDP range for higher-end CPUs.
Overall score
Specifications
| Spec | Noctua NH-L9i-17xx | Thermalright Assassin King 120 SE ARGB CPU Air Cooler |
|---|---|---|
| Brand | Noctua | Thermalright |
| Socket Support | LGA1700, LGA1851 | LGA115X, LGA1200, LGA1700, AM4, AM5 |
| Fan Speed | PWM | 1550 RPM |
| Noise Level | Very Low | 25.6 dB(A) |
| Warranty | 6 years | Not specified |
Dimension comparison
Overview of the Noctua NH-L9i-17xx
The Noctua NH-L9i-17xx is a compact CPU cooler priced at C$59.95. It is designed specifically for Intel’s LGA1851 and LGA1700 platforms, making it an appealing choice for users with smaller cases. Its low height of just 37mm allows compatibility with compact HTPC and Small Form Factor (SFF) cases, ensuring that it does not interfere with RAM or PCIe slots on ITX, Micro-ATX, and ATX motherboards. This cooler is known for its quality, earning over 200 awards and recommendations from international hardware websites.
Notably, the NH-L9i-17xx features a renowned NF-A9x14 slim 92mm fan, which operates quietly while delivering strong cooling performance when needed. This balance between noise and efficiency is further enhanced by the inclusion of a Low-Noise Adaptor and PWM for automatic speed control. Additionally, it comes with high-end NT-H1 thermal paste and a SecuFirm2 mounting system for straightforward installation.
Overview of the Thermalright Assassin King 120 SE ARGB
The Thermalright Assassin King 120 SE ARGB is an affordable CPU cooler retailing at C$24.59, making it an attractive option for budget-conscious consumers. With dimensions of 120mm in length, 73mm in width, and a height of 148mm, it is suitable for medium-sized computer cases. The cooler is compatible with both Intel and AMD platforms, supporting a variety of sockets including Intel: 115X, 1200, 1700, and AMD: AM4, AM5.
Equipped with a 120mm PWM fan, this cooler promises to combine efficient cooling with low noise levels, producing a maximum airflow of 66.17 CFM and a noise level of only 25.6 dB(A). Additionally, the Assassin King employs a unique AGHP technique with five 6mm heat pipes to enhance heat dissipation and ensure longevity, with a lifespan rated at up to 20,000 hours. The ARGB lighting adds a visually appealing element that can enhance the aesthetics of any build.
Cooling Performance Comparison
In terms of cooling performance, the Noctua NH-L9i-17xx targets users with moderate heat loads, making it a suitable choice for Intel Core and Core Ultra processors. Its slim fan design ensures that cooling is efficient even in tight spaces, while its award-winning technology has been proven effective in various builds.
On the other hand, the Thermalright Assassin King 120 SE ARGB is designed to handle a broader thermal design power (TDP) range of 125 to 235W. This capability suggests that it may perform better with higher-end CPUs that generate more heat. The combination of its larger fan and AGHP technology further enhances its cooling potential, making it a suitable option for users looking for robust performance in larger cases.
Noise Levels and Operation
The Noctua NH-L9i-17xx is designed for whisper-quiet operation, especially at idle, thanks to its Low-Noise Adaptor and PWM control that adjusts fan speed based on thermal demand. This feature is particularly beneficial for users who prioritize a silent computing experience, such as those using their systems for media consumption or in quiet environments.
In contrast, the Thermalright Assassin King 120 SE ARGB operates at a maximum noise level of 25.6 dB(A). While this is relatively low, it is slightly higher than the Noctua's near-silent operation. However, the Assassin King's ARGB lighting and overall design may attract users who are willing to accept a bit more noise for enhanced visual appeal and cooling performance.
Design and Aesthetics
The Noctua NH-L9i-17xx features a minimalist design aimed at function over form, with a colour scheme that is more subdued. Its compact design makes it an unobtrusive choice for smaller builds, where space is at a premium.
Conversely, the Thermalright Assassin King 120 SE ARGB comes equipped with vibrant ARGB lighting, appealing to gamers and PC builders looking to create visually dynamic setups. Its larger size allows for more prominent design elements, making it a focal point in a case. The combination of metal fasteners and robust materials reflects a commitment to durability and aesthetics, appealing to users who value both functionality and style.
Installation and Compatibility
The Noctua NH-L9i-17xx is designed for easy installation on Intel LGA1700 and LGA1851 CPUs, thanks to its included SecuFirm2 mounting system and high-quality thermal paste. Its tailored footprint ensures compatibility across various motherboard formats, making it a versatile choice for numerous builds.
The Thermalright Assassin King 120 SE ARGB also boasts straightforward installation, supporting a wide range of Intel and AMD sockets. Its design includes specific mounting plates and fasteners for different platforms, which can simplify the setup process. However, its larger dimensions may require more space, and users should ensure their cases can accommodate its height of 148mm.
Price Comparison
When it comes to price, the Noctua NH-L9i-17xx is significantly more expensive at C$59.95 compared to the Thermalright Assassin King 120 SE ARGB, which retails for only C$24.59. This stark difference in pricing reflects the premium quality and brand reputation of Noctua, which is backed by its extensive awards and performance accolades.
On the other hand, the affordability of the Thermalright Assassin King makes it an appealing choice for budget-conscious consumers or those building entry-level systems. Despite its lower price, users should carefully consider whether the cooling performance and features align with their specific needs.
Which should you buy?
Choosing between the Noctua NH-L9i-17xx and the Thermalright Assassin King 120 SE ARGB depends largely on your specific needs and preferences. If you are looking for a compact, high-quality cooler that excels in silent operation and is designed for moderate heat loads, the Noctua is a solid choice, albeit at a higher price point.
Alternatively, if you are on a budget and require a cooler that can handle a wider range of CPU heat outputs while also offering impressive aesthetics with ARGB lighting, the Thermalright Assassin King 120 SE ARGB is an excellent value. Ultimately, the decision should be based on your system requirements, budget, and personal design preferences.
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