Thermalright Peerless Assassin 120 Digital ARGB Black CPU Air Cooler vs Noctua NH-U9S
Updated August 2026 — The Thermalright Peerless Assassin 120 offers better cooling performance and value for money, while the Noctua NH-U9S excels in low noise and compact design.
The Thermalright Peerless Assassin 120 offers better cooling performance and value for money, while the Noctua NH-U9S excels in low noise and compact design.
Why Thermalright Peerless Assassin 120 Digital ARGB Black CPU Air Cooler is better
Price
Thermalright is cheaper at C$52.62 compared to Noctua's C$74.95.
Cooling Performance
Thermalright has dual fans providing 88.89 CFM airflow.
Aesthetics
Thermalright features customizable ARGB lighting.
Why Noctua NH-U9S is better
Noise Level
Noctua is designed for ultra-quiet operation.
Compact Size
Noctua fits better in small form factor builds.
Build Quality
Noctua is backed by a 6-year warranty.
Overall score
Specifications
| Spec | Thermalright Peerless Assassin 120 Digital ARGB Black CPU Air Cooler | Noctua NH-U9S |
|---|---|---|
| Fan Speed | 1850 RPM | 1500 RPM |
| Noise Level | ≤25.6 dB(A) | ≤22.4 dB(A) |
| Compatibility | AMD AM4/AM5, Intel LGA 1150/1151/1155/1156/1200 | AMD AM4/AM5, Intel LGA 1851/1700/1200/115x |
| Installation | Easy with SS2 clips | SecuFirm2 system |
| Warranty | N/A | 6 years |
Dimension comparison
Overview of the Thermalright Peerless Assassin 120 Digital ARGB Black and Noctua NH-U9S
The Thermalright Peerless Assassin 120 Digital ARGB Black is priced at C$52.62, making it a more budget-friendly option compared to the Noctua NH-U9S, which retails for C$74.95. This price difference indicates that the Thermalright cooler may appeal more to cost-conscious users looking for effective cooling solutions without breaking the bank.
The Thermalright model features a dual-tower design with dual fans, while the Noctua option adopts a compact single-tower design. Each cooler targets different market segments, with the Thermalright focusing on high airflow and cooling performance, and Noctua prioritising compatibility and quiet operation in smaller builds.
Cooling Performance
Cooling performance is a critical aspect of CPU coolers, and the Thermalright Peerless Assassin excels with its dual-fan setup. Operating at a speed of 1850 RPM and providing an airflow of 88.89 CFM, it promises excellent heat dissipation. The dual fans also contribute to a lower operational noise level of ≤25.6 dB (A), which is commendable for users seeking a quieter environment.
In contrast, the Noctua NH-U9S utilises a single 92mm fan, optimised for low noise and efficient cooling. Although it is designed to fit in smaller cases, its performance may not match the higher airflow numbers of the Thermalright model, especially in demanding scenarios. However, the NH-U9S is engineered for quieter operation, making it ideal for users who prioritise silence over sheer cooling power.
Design and Aesthetics
The design of the Thermalright Peerless Assassin incorporates ARGB lighting effects, allowing users to customise the cooler's appearance through their motherboard’s built-in lighting software. This feature enhances the aesthetic appeal for builders who enjoy a vibrant setup.
On the other hand, the Noctua NH-U9S adopts a more utilitarian look with its brown and beige colour scheme, which lacks the flashy lighting of its competitor. While it may not be as visually striking, the NH-U9S is known for its understated design that fits well in various builds, especially in HTPC or ITX setups where space is a premium.
Compatibility
Compatibility is essential for CPU coolers, and both products offer a broad range of support. The Thermalright Peerless Assassin is compatible with various platforms, including AMD AM4/AM5 and Intel LGA 1150/1151/1155/1156/1200. Its versatile mounting clips make installation straightforward across different CPU models.
The Noctua NH-U9S also boasts wide compatibility, supporting Intel LGA 1851, LGA 1700, LGA 1200, and AMD AM4/AM5 sockets. Its compact size and efficient design make it particularly suitable for small form factor builds that may struggle with larger coolers. Users looking for a cooler that can fit into tight spaces will appreciate the NH-U9S’s thoughtful design.
Installation Process
Installation can significantly impact user experience, and both coolers are designed to be user-friendly. The Thermalright Peerless Assassin comes with SS2 clips that simplify the mounting process, allowing users to easily install and remove the cooler. The included Y-type adapter enables the connection of both fans to a single motherboard interface, streamlining installation further.
Conversely, the Noctua NH-U9S features the SecuFirm2 mounting system, which is recognised for its ease of installation. This system includes high-end NT-H1 thermal paste, ensuring optimal thermal conductivity. Users can expect a straightforward installation process with the NH-U9S, particularly beneficial for those who may be unfamiliar with cooler setups.
Noise Levels
When considering noise levels, the Thermalright Peerless Assassin maintains a maximum operational noise of ≤25.6 dB (A). This level is relatively quiet, especially for a cooler designed with dual fans, making it suitable for most users looking for a balance between performance and noise.
The Noctua NH-U9S is engineered specifically for low-noise operation, thanks to its optimised fan design and PWM support. With the addition of a Low-Noise Adaptor, users can expect an ultra-quiet experience even under load. This makes the NH-U9S particularly appealing for users who prioritise a silent computing environment, such as gamers or media creators working in quiet spaces.
Price vs. Value
Price is a significant factor when choosing between these two coolers. The Thermalright Peerless Assassin is priced at C$52.62, offering a strong balance of performance features for its cost. Its dual-tower design and ARGB lighting provide excellent value for users wanting effective cooling without a hefty price tag.
On the contrary, the Noctua NH-U9S is priced higher at C$74.95, reflecting its reputation for quality and performance. While it may not deliver the same airflow as the Thermalright model, its compact size and low noise levels justify the cost for users prioritising compatibility and silence in their builds.
Which should you buy?
In summary, the choice between the Thermalright Peerless Assassin 120 Digital ARGB Black and the Noctua NH-U9S largely depends on your specific needs and preferences. If you are looking for a budget-friendly cooler with exceptional cooling performance and ARGB aesthetics, the Thermalright model is an excellent choice. However, if you prefer a compact design that prioritises low noise and high compatibility for small builds, the Noctua NH-U9S is the way to go. Ultimately, both coolers have their strengths, making them suitable for different types of users and builds.
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