Thermalright Assassin X 120R SE V2 CPU Air Cooler vs Noctua NH-U9S
Updated August 2026 — The Thermalright Assassin X 120R SE V2 offers great value for budget-conscious users, while the Noctua NH-U9S excels in performance and noise levels. Choose based on your priorities.
The Thermalright Assassin X 120R SE V2 offers great value for budget-conscious users, while the Noctua NH-U9S excels in performance and noise levels. Choose based on your priorities.
Why Thermalright Assassin X 120R SE V2 CPU Air Cooler is better
affordable price
C$23.59 vs C$74.95
compact height
148mm vs 125mm
broad compatibility
supports more CPU sockets
Why Noctua NH-U9S is better
premium quality
renowned brand reputation
quiet operation
Low-Noise Adaptor for optimal performance
better cooling performance
highly optimised NF-A9 fan
Overall score
Specifications
| Spec | Thermalright Assassin X 120R SE V2 CPU Air Cooler | Noctua NH-U9S |
|---|---|---|
| Price | C$23.59 | C$74.95 |
| Noise Level | 25.6 dB(A) | not disclosed |
| Fan Speed | 1550 RPM | not specified |
| Warranty | not specified | 6 years |
| Socket Support | LGA1150/1200/AM4/AM5 | LGA1851/1700/AM4/AM5 |
Dimension comparison
Introduction to CPU Coolers
When it comes to CPU coolers, choosing the right one can significantly impact your computer's performance and longevity. In this comparison, we will examine the Thermalright Assassin X 120R SE V2 and the Noctua NH-U9S. Both coolers are designed to provide efficient cooling but differ substantially in design, pricing, and features.
Design and Build Quality
The Thermalright Assassin X 120R SE V2 features a compact design with a height of 148mm, making it suitable for medium-sized cases without obstructing memory installation. Its construction includes industrial-grade materials that ensure durability and longevity. On the other hand, the Noctua NH-U9S is designed with a single-tower structure that stands at only 125mm tall. This compact design is particularly advantageous for HTPC and ITX builds, ensuring compatibility with RAM and PCIe slots on most current motherboards.
Cooling Performance
In terms of cooling performance, the Thermalright Assassin X 120R SE V2 employs a PWM fan with a maximum airflow of 66.17 CFM and operates at a noise level of 25.6 dB(A). Its advanced AGHP technology allows for effective heat dissipation, making it a strong contender for high-performance cooling. Conversely, the Noctua NH-U9S is equipped with a highly optimised NF-A9 92mm fan, known for its ultra-quiet operation and efficient cooling performance. While specific airflow figures are not provided for the NH-U9S, its design is aimed at delivering strong cooling while maintaining a low noise profile, making it a reliable choice for performance-oriented users.
Compatibility
The Thermalright Assassin X 120R SE V2 boasts broad compatibility with various Intel and AMD sockets, including LGA1150, LGA1200, AM4, and AM5, ensuring it can fit into a wide range of builds. It comes with the necessary mounting plates and fasteners for easy installation. In contrast, the Noctua NH-U9S also offers excellent compatibility, supporting Intel LGA1851, LGA1700, LGA1200, LGA115x, and AMD AM4 & AM5. It includes the SecuFirm2 mounting system, which simplifies installation and enhances efficiency, particularly with offset mounting options.
Noise Levels
Noise levels play a crucial role in user experience, especially for those building quiet systems. The Thermalright Assassin X 120R SE V2 operates at a noise level of 25.6 dB(A), which is relatively quiet and suitable for environments where noise is a concern. The Noctua NH-U9S is designed specifically for quiet operation, incorporating a Low-Noise Adaptor that regulates fan speed for optimal performance without generating excessive noise. While specific dB levels are not disclosed, Noctua is renowned for producing some of the quietest fans on the market.
Price Comparison
In terms of pricing, the Thermalright Assassin X 120R SE V2 is significantly more affordable at C$23.59. This budget-friendly option allows users to achieve decent cooling performance without breaking the bank. In contrast, the Noctua NH-U9S comes with a price tag of C$74.95. While it is more expensive, this price reflects its premium build quality and brand reputation, as Noctua is often regarded as a top choice among enthusiasts for reliability and performance.
Brand Reputation
Thermalright has a solid reputation built over more than 20 years in the industry, focusing on R&D for computer accessories. Their products are well-regarded among gamers and builders alike. Noctua, on the other hand, is synonymous with quality in the cooling industry, known for their attention to detail and long-lasting products, often backed by a six-year warranty. This reputation can be a deciding factor for users prioritising reliability and customer service.
User Experience
User experience can heavily influence purchasing decisions. The Thermalright Assassin X 120R SE V2 is designed for straightforward installation, with instructions and mounting hardware included. This accessibility is a significant advantage for novice builders. The Noctua NH-U9S also emphasises ease of use with its SecuFirm2 mounting system. Additionally, it comes with high-end NT-H1 thermal paste, enhancing the overall user experience by eliminating the need for additional purchases.
Which should you buy?
Ultimately, your choice between the Thermalright Assassin X 120R SE V2 and the Noctua NH-U9S will depend on your specific needs and budget. If you are looking for a cost-effective solution that offers decent cooling performance in a compact size, the Thermalright model is an excellent choice at C$23.59. However, if you prefer premium quality, exceptional noise performance, and are willing to invest more for long-term reliability, the Noctua NH-U9S at C$74.95 stands out as a superior option. Each cooler has its strengths, making them suitable for different users and builds.
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