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Noctua NH-U9S chromax.Black, vs Thermalright Peerless Assassin 120 SE V3 CPU Air

Updated August 2026 — Noctua NH-U9S chromax.Black, wins on warranty and noise level, Thermalright Peerless Assassin 120 SE V3 CPU Air wins on compatibility.

The Noctua NH-U9S chromax.Black excels in quiet operation and build quality, while the Thermalright Peerless Assassin 120 SE V3 offers superior cooling performance at a lower price.

Why Noctua NH-U9S chromax.Black, is better

Noise Level

Quieter operation under load

Warranty

Longer six-year warranty

Build Quality

Premium materials and design

Why Thermalright Peerless Assassin 120 SE V3 CPU Air is better

Price

More affordable at $35.90

Cooling Performance

Better airflow with dual fans

Heat Pipes

More heat pipes for improved dissipation

Overall score

Noctua NH-U9S chromax.Black,
85
Thermalright Peerless Assassin 120 SE V3 CPU Air
75

Specifications

SpecNoctua NH-U9S chromax.Black,Thermalright Peerless Assassin 120 SE V3 CPU Air
Fan RPM15002000
Air Volume54.6 CFM70.84 CFM
Noise Level≤25 dB(A)≤29.8 dB(A)
CompatibilityLGA115x, AM4LGA115x, AM4/AM5
Warranty6 yearsNot specified

Dimension comparison

Noctua NH-U9S chromax.Black,Thermalright Peerless Assassin 120 SE V3 CPU Air

Overview of the Noctua NH-U9S chromax.Black and Thermalright Peerless Assassin 120 SE V3

The Noctua NH-U9S chromax.Black and the Thermalright Peerless Assassin 120 SE V3 are both premium CPU coolers designed to provide efficient thermal management for your processor. The Noctua unit is priced at $74.95, while the Thermalright model is significantly less expensive at $35.90, making it about 52% cheaper. This price difference may influence buyers who are budget-conscious but looking for quality.

Design and Build Quality

The Noctua NH-U9S chromax.Black features a compact 92mm single-tower design, making it suitable for cases with limited space. Its all-black aesthetic is not only stylish but also ensures compatibility with various build color schemes. On the other hand, the Thermalright Peerless Assassin 120 SE V3 adopts a larger double-tower structure with dual fans, enabling it to offer enhanced cooling performance. Its build incorporates a 2000RPM high-speed PWM fan and six heat pipes, which are designed to improve heat dissipation efficiency. While the Noctua cooler is more compact, the Thermalright cooler's additional size might provide better heat management for high-performance CPUs.

Cooling Performance

When it comes to cooling performance, the Noctua NH-U9S chromax.Black is known for its whisper-quiet operation and efficient thermal management, thanks to its renowned NF-A9 92mm fan. The fan's design allows for full cooling performance under load while remaining nearly silent during idle situations. In contrast, the Thermalright Peerless Assassin 120 SE V3 boasts dual PWM fans that can achieve up to 2000 RPM, facilitating substantial airflow and heat dissipation. With an air volume of 70.84 CFM and maximum operating noise of ≤29.8 dB(A), this cooler is engineered for effective cooling without excessive noise. While both coolers perform admirably, the Thermalright’s dual-fan setup may be more effective in high-demand scenarios.

Compatibility

The Noctua NH-U9S chromax.Black is widely compatible with a range of Intel and AMD sockets, including LGA1851, LGA1700, LGA1200, LGA115x, as well as AMD AM5 and AM4. This broad compatibility ensures that it can fit into many systems without issues. Conversely, the Thermalright Peerless Assassin 120 SE V3 also supports a wide array of Intel and AMD processors, including LGA 1851/1700/1150/1151/1155/1156/1200 and AMD AM4/AM5 sockets. Both products are designed to accommodate the latest generation CPUs, making either choice a viable option for modern builds.

Installation Process

The installation process for the Noctua NH-U9S chromax.Black is straightforward, aided by its SecuFirm2 mounting system. This design ensures an easy installation across various motherboard types without complicated procedures. The Thermalright Peerless Assassin 120 SE V3 also offers a user-friendly installation experience, complete with mounting accessories and an installation video. However, it is noted that users must utilize the original backplate of the motherboard when installing on AMD platforms. While both products are accessible for installation, the Noctua cooler may offer a slight edge in simplicity due to its established mounting system.

Noise Levels

In terms of noise levels, the Noctua NH-U9S chromax.Black is acclaimed for its low-noise operation, especially when paired with the Low-Noise Adaptor, which ensures whisper-quiet performance during less demanding tasks. In contrast, the Thermalright Peerless Assassin 120 SE V3 operates with a maximum noise level of ≤29.8 dB(A), which is still relatively quiet but may be more noticeable under load compared to the Noctua unit. For users who prioritize a silent computing experience, the Noctua option stands out as the quietest solution.

Warranty and Support

The Noctua NH-U9S chromax.Black comes with a six-year manufacturer’s warranty, reinforcing the brand's commitment to quality and reliability. This extensive warranty period reflects confidence in the product's durability and performance. The Thermalright Peerless Assassin 120 SE V3's warranty specifics are not mentioned, which may be a consideration for buyers who value long-term assurance. The Noctua cooler's warranty might appeal to those looking for long-term investment security.

Which should you buy?

Choosing between the Noctua NH-U9S chromax.Black and the Thermalright Peerless Assassin 120 SE V3 ultimately comes down to your specific needs and budget. If you are looking for a compact, premium cooler with silent operation and a robust warranty, the Noctua NH-U9S chromax.Black at $74.95 is an excellent choice. However, if you prioritize cost-effectiveness and superior cooling performance in high-demand scenarios, the Thermalright Peerless Assassin 120 SE V3 at $35.90, which is about 52% cheaper, is a compelling option. Both coolers are capable and compatible with modern CPUs, making either a solid choice for your build.