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Noctua NH-U9S vs Thermalright Assassin King 120 SE White ARGB CPU

Updated August 2026 — Noctua NH-U9S leads on warranty and cooling.

The Noctua NH-U9S offers superior cooling performance and quieter operation, making it the better choice for high-performance builds. The Thermalright Assassin King 120 SE is a budget-friendly option with decent performance.

Why Noctua NH-U9S is better

Cooling Performance

NH-U9S excels in managing heat for high-performance CPUs.

Noise Levels

NH-U9S operates quieter than the Assassin King.

Build Quality

NH-U9S has a reputation for superior construction and durability.

Why Thermalright Assassin King 120 SE White ARGB CPU is better

Price

Assassin King is significantly cheaper.

RGB Lighting

Assassin King features modern RGB aesthetics.

Weight

Assassin King is lighter, making it easier to install.

Overall score

Noctua NH-U9S
85
Thermalright Assassin King 120 SE White ARGB CPU
65

Specifications

SpecNoctua NH-U9SThermalright Assassin King 120 SE White ARGB CPU
Max Noise22 dB(A)25.6 dB(A)
AirflowN/A66.17 CFM
Socket SupportIntel/AMDIntel/AMD
Warranty6 years3 years
Fan TypePWMPWM

Dimension comparison

Noctua NH-U9SThermalright Assassin King 120 SE White ARGB CPU

Overview of the Noctua NH-U9S

The Noctua NH-U9S is a premium CPU cooler designed for compact builds, featuring a robust single-tower design. Priced at $69.95, it offers strong cooling performance while maintaining excellent compatibility with cases, RAM, and PCIe slots.

Standing at only 125mm in height, the NH-U9S is ideal for HTPCs, ITX, and small form factor builds. Its compact design ensures that it does not overhang RAM or PCIe slots on most current motherboards, making it a versatile choice for various setups. The highly optimized NF-A9 92mm fan with PWM support is engineered for ultra-quiet operation, which is further enhanced by the inclusion of a Low-Noise Adapter. The cooler comes with high-end NT-H1 thermal paste and a SecuFirm2 mounting system, facilitating easy installation across a wide range of Intel and AMD sockets.

Overview of the Thermalright Assassin King 120 SE

The Thermalright Assassin King 120 SE is a budget-friendly CPU cooler priced at just $19.82, making it significantly cheaper than the Noctua NH-U9S. This cooler offers a balance of performance and affordability, featuring five heat pipes for efficient heat dissipation.

With dimensions of 120x73x148mm and a weight of 0.64kg, the Assassin King 120 SE is designed to fit medium-sized computer cases. It utilizes advanced AGHP technology, which effectively addresses the inverse gravity effect in both vertical and horizontal orientations. The cooler is equipped with a TL-C12CW-S PWM fan, delivering a maximum airflow of 66.17 CFM while maintaining a noise level of less than 25.6 dB(A). This cooler is compatible with a variety of Intel and AMD sockets, ensuring broad usability across different platforms.

Cooling Performance

In terms of cooling performance, the Noctua NH-U9S is renowned for its efficiency in managing heat in compact builds. Its optimized fan design and compact profile enhance the overall thermal management of the CPU, making it suitable for high-performance applications.

Conversely, the Thermalright Assassin King 120 SE, with its five heat pipes, also provides commendable cooling capabilities, particularly for a cooler in its price range. While it may not match the NH-U9S in terms of performance under extreme conditions, it still delivers adequate cooling for most users, particularly those on a budget. The NH-U9S's thermal performance is ideal for mid to high-end CPUs, while the Assassin King is more suited for mid-range processors.

Noise Levels

Noise levels are a critical consideration for many PC builders, particularly those aiming for a quiet computing environment. The Noctua NH-U9S excels in this regard, designed with a focus on low-noise operation. Its NF-A9 fan, combined with the Low-Noise Adapter, allows for ultra-quiet performance, making it one of the best options for silent builds.

On the other hand, the Thermalright Assassin King 120 SE operates at a maximum noise level of 25.6 dB(A), which is relatively quiet for a budget cooler. However, it may not achieve the same level of silence as the NH-U9S under load. Users who prioritize a whisper-quiet operation may find the Noctua cooler more appealing, particularly for scenarios where noise is a primary concern.

Installation and Compatibility

Installation and compatibility are vital for ensuring that a cooler fits well within a build. The Noctua NH-U9S features the SecuFirm2 mounting system, which makes installation straightforward across various Intel and AMD sockets, including LGA1851, LGA1700, and AM5.

Similarly, the Thermalright Assassin King 120 SE offers a user-friendly installation process with metal fasteners provided for both Intel and AMD platforms. The cooler's compatibility with a wide range of sockets, including LGA1700 and AM4, ensures it can be used in diverse setups. While both coolers are easy to install, the NH-U9S's reputation for quality construction may provide an edge in terms of durability and long-term reliability.

Aesthetic Appeal

Aesthetics can play a significant role in a PC build, especially for users who value the visual aspect of their components. The Noctua NH-U9S features a classic brown and beige design that has become synonymous with the brand, appealing to users who appreciate a more understated look.

In contrast, the Thermalright Assassin King 120 SE comes with RGB lighting, offering a more modern and vibrant aesthetic for builds that prioritize visual flair. Its white design and ARGB capabilities make it an attractive choice for users looking to enhance the overall appearance of their system, especially in builds with transparent cases. The choice between these two coolers may come down to personal preference regarding style.

Price Comparison

When it comes to price, the Thermalright Assassin King 120 SE is significantly more affordable at $19.82, which is about 72% cheaper than the Noctua NH-U9S priced at $69.95. This substantial price difference makes the Assassin King a compelling option for budget-conscious consumers seeking reliable cooling solutions without breaking the bank.

However, the higher cost of the NH-U9S can be justified by its superior cooling performance, quieter operation, and enhanced build quality. Buyers should consider their budget alongside their performance requirements when making a decision, as the price gap reflects the differences in capabilities and features.

Which should you buy?

Choosing between the Noctua NH-U9S and the Thermalright Assassin King 120 SE ultimately depends on your specific needs and budget. If you're seeking a high-performance cooler with low noise levels and excellent compatibility for compact builds, the NH-U9S is worth the investment. On the other hand, if you're looking for a cost-effective solution that still provides solid cooling performance, the Assassin King 120 SE is a great option. Consider your priorities in terms of price, performance, and aesthetics to determine which cooler aligns best with your build requirements.