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Noctua NH-U9S chromax.Black, vs Thermalright Assassin X 120R SE V2 CPU Cooler, 4×

Updated August 2026 — Noctua NH-U9S chromax.Black, leads on warranty and noise level.

The Noctua NH-U9S chromax.Black excels in performance and noise levels, making it the better choice for high-end users. The Thermalright Assassin X 120R SE V2 is a budget-friendly option but lacks the premium features.

Why Noctua NH-U9S chromax.Black, is better

Performance

Quieter operation under load

Warranty

6-year warranty vs unspecified

Reputation

More awards and recommendations

Why Thermalright Assassin X 120R SE V2 CPU Cooler, 4× is better

Price

Significantly lower cost

Size

Compact for budget builds

Cooling

Higher airflow at lower price

Overall score

Noctua NH-U9S chromax.Black,
85
Thermalright Assassin X 120R SE V2 CPU Cooler, 4×
65

Specifications

SpecNoctua NH-U9S chromax.Black,Thermalright Assassin X 120R SE V2 CPU Cooler, 4×
Fan SpeedN/A1550 RPM
AirflowN/A66.17 CFM
Noise LevelVery Low25.6 dB(A)
Socket CompatibilityIntel/AMDIntel/AMD
InstallationEasyStandard

Dimension comparison

Noctua NH-U9S chromax.Black,Thermalright Assassin X 120R SE V2 CPU Cooler, 4×

Overview of the Products

The Noctua NH-U9S chromax.Black is a compact 92mm single-tower CPU cooler priced at $74.95, while the Thermalright Assassin X 120R SE V2 CPU cooler is a more budget-friendly option at $16.59. At first glance, the significant price difference of about 352% suggests that the Noctua is aimed at high-performance users, while the Thermalright caters to those looking for basic cooling solutions.

The Noctua is renowned for its premium heatsink design, receiving over 100 awards from hardware websites, indicating its strong reputation in the market. In contrast, the Thermalright cooler, while lower in price, features a robust design with four heat pipes and a 120mm fan, implying a different target audience—users who may prioritize cost-effectiveness over premium features.

Design and Build Quality

In terms of design, the Noctua NH-U9S chromax.Black boasts an all-black finish that complements various color schemes, making it visually appealing for build aesthetics. Its compact 92mm size is optimized for compatibility with most cases, ensuring that it does not overhang RAM slots or block PCIe slots on ITX motherboards.

On the other hand, the Thermalright Assassin X 120R SE V2 features a larger form factor with dimensions of 120(L)x71(W)x148(H)mm. While it offers a more robust cooling solution with four heat pipes, its height of 148mm may limit compatibility with smaller cases. However, it is designed to ensure that it does not obstruct memory installation, which is a critical factor for many PC builders.

Cooling Performance

The Noctua NH-U9S is equipped with the award-winning NF-A9 92mm fan that operates quietly, providing full cooling performance under load while remaining whisper-quiet during idle periods. This characteristic makes it an excellent choice for users who prioritize a silent computing experience.

Conversely, the Thermalright Assassin X 120R SE V2 features a 120mm PWM fan that can reach speeds of 1550 RPM, producing a maximum airflow of 66.17 CFM. While it operates efficiently, its noise level can reach up to 25.6dB(A), which may be noticeable in quieter environments. Therefore, users seeking silent operation might find the Noctua a better choice, while those needing aggressive cooling may prefer the Thermalright's performance capabilities.

Installation and Compatibility

Both coolers come with comprehensive mounting systems that ensure easy installation on various CPU sockets. The Noctua NH-U9S includes the SecuFirm2 mounting system, compatible with Intel's LGA1851, LGA1700, LGA1200, LGA115x, and AMD's AM5 & AM4 sockets. This versatility makes it suitable for a wide range of builds.

The Thermalright Assassin X 120R SE V2 supports a similar range of sockets, including Intel's LGA1150/1151/1155/1156/1200/1700/1851 and AMD's AM4/AM5. It also comes with metal fasteners for better installation. Overall, both products offer excellent compatibility, but the Noctua's installation system is often praised for its ease of use.

Noise Levels

The Noctua NH-U9S is designed for low-noise operation, featuring a Low-Noise Adaptor that allows for automatic speed control. This ensures that the fan remains quiet during less intensive tasks, making it a suitable choice for users who desire a peaceful working environment.

In comparison, the Thermalright Assassin X 120R SE V2’s fan operates at a maximum noise level of 25.6dB(A). While still relatively quiet, it may not match the Noctua's silent performance under load. For users prioritizing noise levels, the Noctua is likely the superior option, whereas the Thermalright may appeal to those who value cooling performance more than noise.

Warranty and Support

Noctua is well-regarded for its customer support and warranty offerings, backing the NH-U9S with a generous 6-year manufacturer’s warranty. This assurance reflects the company’s confidence in its product quality and longevity, which can be a deciding factor for potential buyers.

The Thermalright Assassin X 120R SE V2 does not specify warranty details in the provided information. This lack of clarity may lead some users to prefer the Noctua, which provides a clear commitment to product quality through its extended warranty.

User Reviews and Reputation

The Noctua NH-U9S has received widespread acclaim, reflected in its numerous awards and recommendations, making it a trusted choice among enthusiasts. Its reputation for reliability and performance is well-established, positioning it as a preferred option for high-end builds.

The Thermalright Assassin X 120R SE V2, while not as universally recognized, has carved a niche in the budget segment. Users appreciate its value for money, particularly for those not needing the high-performance features offered by premium brands. However, its less prominent reputation may lead some users to opt for the more established Noctua cooler.

Which should you buy?

Choosing between the Noctua NH-U9S chromax.Black and the Thermalright Assassin X 120R SE V2 ultimately depends on your specific needs and budget. If you’re looking for a high-performance, low-noise cooler with a stellar reputation and a long warranty, the Noctua NH-U9S at $74.95 is the superior choice. However, if you are on a tight budget and need a decent cooling solution with a lower price tag of $16.59, the Thermalright Assassin X 120R SE V2 offers great value for its price, especially for users who prioritize cost over premium features.