Thermalright Assassin X 120R SE V2 CPU Air Cooler vs Noctua NH-L9i-17xx
Updated August 2026 — The Thermalright Assassin X 120R SE V2 offers excellent value for budget-conscious users, while the Noctua NH-L9i-17xx excels in compact design and quiet operation.
The Thermalright Assassin X 120R SE V2 offers excellent value for budget-conscious users, while the Noctua NH-L9i-17xx excels in compact design and quiet operation.
Why Thermalright Assassin X 120R SE V2 CPU Air Cooler is better
lower price
C$23.59 vs C$59.95
height
148mm vs 37mm for larger cases
compatibility
supports more CPU sockets
Why Noctua NH-L9i-17xx is better
quiet operation
whisper-quiet design
brand reputation
over 200 awards received
compact size
ideal for small form factor builds
Overall score
Specifications
| Spec | Thermalright Assassin X 120R SE V2 CPU Air Cooler | Noctua NH-L9i-17xx |
|---|---|---|
| Price | C$23.59 | C$59.95 |
| Noise Level | 25.6 dB(A) | whisper-quiet |
| Fan Speed | 1550 RPM | PWM controlled |
| Socket Support | LGA1150/1151/1155/1156/1200/1700/AM4/AM5 | LGA1700/LGA1851 |
| Warranty | 2 years | 6 years |
Dimension comparison
Price Comparison
When comparing the Thermalright Assassin X 120R SE V2 and the Noctua NH-L9i-17xx, the price difference is significant. The Thermalright Assassin X 120R SE V2 is priced at C$23.59, while the Noctua NH-L9i-17xx comes in at C$59.95. This means that the Noctua cooler is approximately 2.5 times more expensive than its Thermalright counterpart. For budget-conscious consumers, the Thermalright option presents a more economical choice, especially for users who may not need the advanced features that come with the higher price tag of the Noctua cooler.
Cooling Performance
In terms of cooling performance, both coolers are designed to efficiently dissipate heat, but they cater to different needs. The Thermalright Assassin X 120R SE V2 features a PWM fan with a maximum airflow of 66.17 CFM at a noise level of 25.6 dB(A), which strikes a balance between cooling efficiency and quiet operation. On the other hand, the Noctua NH-L9i-17xx is renowned for its award-winning NF-A9x14 slim 92mm fan, which operates quietly and effectively under load. While specific CFM values for the Noctua are not provided, its design aims for whisper-quiet performance, showcasing its suitability for compact systems where noise is a key concern.
Size and Compatibility
The Thermalright Assassin X 120R SE V2 stands at a height of 148mm, making it suitable for medium-sized cases without obstructing memory installation. It supports a wide range of CPU sockets, including Intel's LGA1700 and AMD's AM4/AM5. In contrast, the Noctua NH-L9i-17xx is significantly more compact at only 37mm in height, making it an ideal choice for small form factor (SFF) cases or HTPC builds. Its tailored footprint ensures 100% compatibility with RAM and PCIe slots on various motherboards, particularly advantageous for users with limited space.
Installation Process
Ease of installation is another factor to consider. The Thermalright Assassin X 120R SE V2 comes with comprehensive installation instructions and mounting plates for various CPU sockets, facilitating a straightforward setup process. Conversely, the Noctua NH-L9i-17xx includes the SecuFirm2 mounting system, which is designed for easy installation on Intel's LGA1700 and LGA1851 CPUs. This system, combined with high-quality NT-H1 thermal paste, ensures that users can achieve optimal thermal performance without hassle.
Noise Levels
Noise levels are crucial for users who value a quiet computing experience. The Thermalright Assassin X 120R SE V2 operates at a noise level of 25.6 dB(A), which is relatively quiet for a cooler of its size and performance. The Noctua NH-L9i-17xx, with its Low-Noise Adaptor, is known for maintaining whisper-quiet operation even under load. While specific noise levels for the Noctua are not disclosed, its design prioritises silent operation, making it a favourite among users who demand low noise in their setups.
Brand Reputation
Brand reputation can influence purchasing decisions, and both Thermalright and Noctua have established themselves as reliable names in the cooling market. Thermalright has over 20 years of experience, focusing on the development of computer accessories, which has earned it a solid reputation in various markets. Meanwhile, Noctua is widely recognized for its premium-quality products, having received over 200 awards and recommendations from international hardware websites. This reputation for quality and performance could sway consumers towards the Noctua NH-L9i-17xx, especially for users looking for proven reliability.
Target Audience
The target audiences for these coolers differ significantly. The Thermalright Assassin X 120R SE V2 is geared towards budget-conscious users who need efficient cooling without breaking the bank. Its compatibility with various CPU sockets makes it a versatile choice for many builds. In contrast, the Noctua NH-L9i-17xx appeals to users who prioritize compact design and whisper-quiet performance, particularly those building high-end small form factor systems. This distinction makes each cooler suitable for different types of users based on their specific requirements.
Which should you buy?
Choosing between the Thermalright Assassin X 120R SE V2 and the Noctua NH-L9i-17xx ultimately depends on your specific needs and budget. If you are looking for an affordable, effective cooling solution with wide compatibility, the Thermalright option at C$23.59 is a compelling choice. However, if you require a compact cooler that excels in quiet operation and offers proven quality, the Noctua NH-L9i-17xx, albeit at a higher price of C$59.95, may be worth the investment. Evaluate your priorities in terms of performance, size, and budget to make the best decision for your system.
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