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Noctua NH-U9S chromax.Black, vs Thermalright Peerless Assassin 120 SE CPU Cooler,

Updated August 2026 — Noctua NH-U9S chromax.Black, wins on warranty and cooling performa, Thermalright Peerless Assassin 120 SE CPU Cooler, wins on compatibility.

The Noctua NH-U9S chromax.Black excels in quiet operation and compact design, while the Thermalright Peerless Assassin 120 SE offers robust cooling at a lower price.

Why Noctua NH-U9S chromax.Black, is better

Quiet Operation

Noctua operates whisper-quiet at idle.

Compact Size

Noctua fits in smaller cases without blocking components.

Brand Reputation

Noctua has over 100 awards for quality.

Why Thermalright Peerless Assassin 120 SE CPU Cooler, is better

Price

Thermalright is about 33% cheaper.

Cooling Power

Thermalright has dual fans for higher airflow.

Value for Money

Thermalright offers solid performance for its price.

Overall score

Noctua NH-U9S chromax.Black,
85
Thermalright Peerless Assassin 120 SE CPU Cooler,
75

Specifications

SpecNoctua NH-U9S chromax.Black,Thermalright Peerless Assassin 120 SE CPU Cooler,
Fan Speedmax 2000 RPM1550 RPM
Noise Level≤25 dB(A)≤25.6 dB(A)
Warranty6 yearsnot specified
Socket SupportIntel/AMDIntel/AMD
Cooling TypeSingle TowerDual Tower

Dimension comparison

Noctua NH-U9S chromax.Black,Thermalright Peerless Assassin 120 SE CPU Cooler,

Design and Aesthetics

The Noctua NH-U9S chromax.Black features a sleek, all-black design that appeals to many users looking for a stylish CPU cooler. In contrast, the Thermalright Peerless Assassin 120 SE showcases a more robust and industrial look, emphasizing its dual-fan setup. The visual appeal of the Noctua is enhanced by its compact 92mm size, which fits well in most cases without blocking RAM slots or PCIe lanes. Meanwhile, the Thermalright, with its larger dimensions (125mm x 135mm x 155mm), may require careful consideration regarding case compatibility, particularly in smaller setups.

Performance and Cooling Efficiency

When it comes to cooling performance, both coolers are engineered for efficiency but cater to different needs. The Noctua NH-U9S is renowned for its effective cooling capabilities combined with a low noise level, thanks to the NF-A9 92mm fan. This fan operates quietly while still managing to deliver full cooling performance under load. On the other hand, the Thermalright Peerless Assassin 120 SE boasts a more powerful setup with its dual 120mm PWM fans, each capable of reaching 1550 RPM and producing a maximum airflow of 66.17 CFM. This configuration is designed to tackle higher thermal loads, making it a strong contender for overclocking scenarios.

Installation and Compatibility

Both coolers offer a user-friendly installation process and broad compatibility with various CPU sockets. The Noctua NH-U9S comes with the SecuFirm2 mounting system, ensuring easy installation on Intel LGA1851, LGA1700, LGA1200, LGA115x, and AMD AM5 & AM4 platforms. Its compact size allows for easy maneuverability during installation. Conversely, the Thermalright Peerless Assassin 120 SE also supports a wide range of Intel and AMD sockets, including LGA 1700 and AM4/AM5. However, it requires the use of the built-in backplane from the motherboard for AMD installation, which may complicate the process for some users.

Noise Levels

In terms of operational noise, the Noctua NH-U9S is specifically designed to operate quietly, making it an excellent choice for users who prioritize a silent computing experience. Its renowned NF-A9 fan runs whisper-quiet at idle, ensuring that it does not disrupt your environment. The Thermalright Peerless Assassin 120 SE, while still relatively quiet with a noise level of up to 25.6 dB(A), may generate slightly more noise due to its larger fans running at higher speeds. This difference is vital for users who are sensitive to sound, especially in quiet office or home environments.

Brand Reputation and Warranty

Noctua is a brand synonymous with quality, having received over 100 awards and recommendations from various hardware review sites. The NH-U9S chromax.Black is backed by a 6-year manufacturer's warranty, reinforcing the brand's commitment to reliability and customer satisfaction. In comparison, Thermalright has a solid reputation as well, particularly in the DIY PC community, with over 20 years of experience. However, the warranty specifics are less highlighted, which might be a deciding factor for some consumers considering long-term investment in cooling solutions.

Price Comparison

One of the most significant differences between these two coolers is their price. The Noctua NH-U9S chromax.Black is priced at $74.95, whereas the Thermalright Peerless Assassin 120 SE comes in at a considerably lower price of $49.99. This makes the Thermalright about 33% cheaper than the Noctua. For budget-conscious buyers, the cost savings with Thermalright might be appealing, especially if performance meets their requirements.

User Experience and Feedback

User feedback often highlights the Noctua NH-U9S for its exceptional cooling performance and quiet operation, making it a favorite among PC builders who value acoustics as much as cooling efficiency. Conversely, the Thermalright Peerless Assassin 120 SE has received praise for its value for money and robust cooling capabilities, particularly in systems requiring higher thermal management. Both products have garnered positive reviews, but the choice may ultimately depend on individual priorities regarding noise, aesthetics, and budget.

Which should you buy?

Choosing between the Noctua NH-U9S chromax.Black and the Thermalright Peerless Assassin 120 SE largely depends on your specific needs and preferences. If you prioritize a compact design, quiet operation, and a strong brand reputation, the Noctua is an excellent choice, despite its higher price. However, if you are looking for a more budget-friendly option that still offers solid cooling performance for demanding tasks, the Thermalright is a compelling alternative. Ultimately, both coolers serve their purpose well, but they cater to slightly different audiences.