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Noctua NH-U9S vs Thermalright Peerless Assassin 120 Black CPU Air Cooler

Updated August 2026The Noctua NH-U9S excels in compact builds and quiet operation, while the Thermalright Peerless Assassin 120 Black offers better cooling performance at a lower price. Choose based on your budget and needs.

The Noctua NH-U9S excels in compact builds and quiet operation, while the Thermalright Peerless Assassin 120 Black offers better cooling performance at a lower price. Choose based on your budget and needs.

Why Noctua NH-U9S is better

Quality

Noctua is known for premium quality and durability.

Noise Level

NH-U9S is engineered for ultra-quiet operation.

Warranty

Noctua offers a 6-year warranty.

Why Thermalright Peerless Assassin 120 Black CPU Air Cooler is better

Price

Thermalright is more budget-friendly.

Cooling Performance

Dual-tower design enhances cooling efficiency.

Aesthetics

Sleek black finish appeals to modern builds.

Overall score

Noctua NH-U9S
85
Thermalright Peerless Assassin 120 Black CPU Air Cooler
75

Specifications

SpecNoctua NH-U9SThermalright Peerless Assassin 120 Black CPU Air Cooler
Cooling TypeSingle TowerDual Tower
Max Noise≤25dB(A)≤25.6dB(A)
Fan SpeedMax 1500 RPMMax 1500 RPM
Socket SupportLGA1700, AM4LGA1150, AM5
AirflowN/A66.17 CFM

Dimension comparison

Noctua NH-U9SThermalright Peerless Assassin 120 Black CPU Air Cooler

Price Comparison

When it comes to price, the Thermalright Peerless Assassin 120 Black is the more budget-friendly option, retailing at C$54.90, while the Noctua NH-U9S is priced at C$74.95. This difference of C$20.05 might be significant for users looking to save on cooling solutions. While the Noctua model is renowned for its quality and performance, the Thermalright cooler offers a compelling value proposition for those on a tighter budget, especially considering the features it brings to the table.

Cooling Performance

The Thermalright Peerless Assassin 120 Black boasts a dual-tower design that enhances cooling efficiency, featuring a total effective heat dissipation area of 9600cm. This design is complemented by two PWM fans that can achieve an airflow of 66.17 CFM, contributing to its superior cooling capabilities. In contrast, the Noctua NH-U9S, with its compact single-tower design, is specifically engineered for small form factor builds, but it still provides strong cooling performance thanks to its highly optimised NF-A9 92mm fan. While both coolers are designed for effective heat dissipation, the Thermalright clearly aims for a more robust performance profile with its dual fan setup.

Design and Build Quality

In terms of design, the Noctua NH-U9S features a compact single-tower design with a height of just 125mm, making it an ideal choice for HTPCs and small form factor builds. It does not overhang RAM or PCIe slots, ensuring compatibility with a variety of setups. The Thermalright Peerless Assassin 120 Black, while slightly larger at 157mm in height, employs a double tower design, which not only improves cooling but also includes a sleek black finish that may appeal to users looking for a modern aesthetic. The build quality of both coolers is commendable, although Noctua is often praised for its durability and is backed by a six-year warranty.

Noise Levels

The Noctua NH-U9S is engineered for ultra-quiet operation, thanks to its low-noise adaptor and PWM support, which allows for automatic speed control. This ensures that it operates quietly during both idle and load conditions. On the other hand, the Thermalright Peerless Assassin 120 Black, with its maximum noise level of 25.6dB(A), is also designed to maintain a relatively quiet profile. However, the emphasis on cooling performance might lead to slightly higher noise levels under heavy loads compared to the Noctua. For users prioritising a silent computing experience, the NH-U9S may have the edge.

Compatibility

Compatibility is a strong point for both coolers. The Noctua NH-U9S supports a wide range of Intel and AMD sockets, including LGA1700 and AM4, with an offset mounting option for optimal efficiency. The Thermalright Peerless Assassin 120 Black also offers extensive compatibility with various Intel and AMD platforms, including LGA1150 and AM5, ensuring that users can easily install it on their existing systems. While both products cater to a broad audience, the Noctua's focus on compact design might make it a more suitable choice for smaller cases.

Installation Process

The installation process for the Noctua NH-U9S is facilitated by its SecuFirm2 mounting system, which is designed for easy setup across multiple socket types. It comes with high-end NT-H1 thermal paste, further simplifying the installation experience. Similarly, the Thermalright Peerless Assassin 120 Black includes metal fasteners specifically designed for Intel and AMD platforms, promoting a straightforward installation. Both coolers aim to provide user-friendly installation processes, though the Noctua's reputation for ease of setup might resonate more with first-time builders.

Brand Reputation

Noctua is well-known for its premium quality and reliability in the CPU cooling market, often regarded as a top-tier brand. Their coolers are frequently recommended for enthusiasts and professionals alike. Thermalright, while also respected, tends to position itself more in the budget segment, offering solid performance at lower price points. The choice between these brands may come down to personal preference, but Noctua's established reputation and long warranty period could sway users who prioritise reliability.

Which should you buy?

Choosing between the Noctua NH-U9S and the Thermalright Peerless Assassin 120 Black ultimately depends on your specific needs and budget. If you are looking for a high-performance cooler that excels in compact builds and offers ultra-quiet operation, the Noctua NH-U9S is a fantastic choice, albeit at a higher price point of C$74.95. Conversely, if you are on a budget and need a cooler that provides excellent cooling performance with good aesthetics, the Thermalright Peerless Assassin 120 Black at C$54.90 offers remarkable value. Consider your priorities—whether they be price, performance, or noise levels—when making your decision.

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Noctua NH-U9S vs Thermalright Peerless Assassin 120 Black CPU Air Cooler | versusfinder