Thermalright Assassin X 120R SE V2 CPU Air Cooler vs Noctua NH-L9x65 chromax.Black
Updated August 2026 — The Thermalright Assassin X 120R SE V2 offers excellent performance at a budget-friendly price, while the Noctua NH-L9x65 chromax.Black excels in compact builds with ultra-quiet operation. Choose based on your specific needs.
The Thermalright Assassin X 120R SE V2 offers excellent performance at a budget-friendly price, while the Noctua NH-L9x65 chromax.Black excels in compact builds with ultra-quiet operation. Choose based on your specific needs.
Why Thermalright Assassin X 120R SE V2 CPU Air Cooler is better
price
Thermalright is significantly cheaper at C$23.59
airflow
Thermalright has a maximum airflow of 66.17 CFM
height
Thermalright is suitable for medium-sized cases
Why Noctua NH-L9x65 chromax.Black is better
compact design
Noctua is only 65mm tall, ideal for small builds
noise performance
Noctua is engineered for ultra-quiet operation
build quality
Noctua uses high-end NT-H1 thermal paste
Overall score
Specifications
| Spec | Thermalright Assassin X 120R SE V2 CPU Air Cooler | Noctua NH-L9x65 chromax.Black |
|---|---|---|
| Brand | Thermalright | Noctua |
| Price | C$23.59 | C$101.95 |
| Noise Level | 25.6 dB(A) | Not specified |
| Socket Support | Intel LGA1150/1151/1155/1156/1200/1700; AMD AM4/AM5 | Intel LGA1851/1700/1200/115x; AMD AM4/AM5 |
| Fan Type | PWM | PWM with Low-Noise Adaptor |
Dimension comparison
Overview of the Thermalright Assassin X 120R SE V2 and Noctua NH-L9x65 chromax.Black
When comparing the Thermalright Assassin X 120R SE V2 and the Noctua NH-L9x65 chromax.Black, it's essential to look at their design, performance, and target audience. The Thermalright model is designed for users seeking efficient cooling with a focus on quiet operation, while the Noctua cooler is built for compact systems, especially in small form factors. Priced at C$23.59, the Thermalright is significantly more affordable than the Noctua, which retails for C$101.95.
Design and Build Quality
The Thermalright Assassin X 120R SE V2 features a well-thought-out design that includes four 6mm heat pipes and a 120mm PWM fan, ensuring efficient heat dissipation. Its height of 148mm makes it suitable for medium-sized computer cases without obstructing RAM installation. In contrast, the Noctua NH-L9x65 chromax.Black is a compact cooler that measures only 65mm in height, making it ideal for HTPCs and ITX builds. This low-profile design allows it to avoid interference with RAM and PCIe slots, which is crucial for small form factor systems. Both coolers exhibit high build quality, with the Thermalright emphasizing longevity through its S-FDB bearings and the Noctua using a high-end NT-H1 thermal paste.
Cooling Performance
Cooling performance is a key factor when selecting a CPU cooler. The Thermalright Assassin X 120R SE V2 offers a maximum airflow of 66.17 CFM, with a noise level capped at 25.6 dB(A). This combination allows it to deliver efficient cooling while maintaining a quiet operation. On the other hand, the Noctua NH-L9x65 chromax.Black features a slim 92mm fan that operates with PWM support and includes a Low-Noise Adaptor for automatic speed control, ensuring ultra-quiet performance. While the exact airflow of the Noctua is not specified, it is designed for CPUs with low to moderate heat dissipation, making it suitable for less demanding applications.
Compatibility and Installation
Both coolers are designed for easy compatibility with various CPU sockets. The Thermalright Assassin X 120R SE V2 supports a wide range of Intel sockets including LGA1150, LGA1151, LGA1155, LGA1156, LGA1200, LGA1700, and AMD AM4/AM5. This extensive compatibility allows it to be used with a variety of builds. The Noctua NH-L9x65 chromax.Black, meanwhile, supports Intel's LGA1851, LGA1700, LGA1200, and LGA115x, along with AMD's AM4 and AM5 sockets. Noctua’s SecuFirm2 mounting system is noted for its ease of installation, making it user-friendly for those new to building PCs.
Target Audience
The Thermalright Assassin X 120R SE V2 is aimed at gamers or users who require effective cooling for high-performance CPUs without breaking the bank. Its affordability at C$23.59 makes it an attractive option for budget-conscious consumers. Conversely, the Noctua NH-L9x65 chromax.Black is tailored for enthusiasts looking for a compact solution in small form factor builds, with a price tag of C$101.95 reflecting its premium branding and reputation for performance. This positioning means that while the Thermalright caters to the masses, the Noctua appeals to a niche market of high-end users.
Noise Levels
When it comes to noise levels, the Thermalright Assassin X 120R SE V2 operates at a maximum of 25.6 dB(A), which is relatively quiet for a CPU cooler capable of high airflow. This makes it suitable for users who prioritize a peaceful working environment. The Noctua NH-L9x65 chromax.Black is specifically engineered for ultra-quiet operation, with its PWM fan and Low-Noise Adaptor ensuring that even under load, it remains as unobtrusive as possible. While specific decibel ratings for the Noctua are not provided, the brand is well-regarded for its noise performance, suggesting it could be quieter than the Thermalright at low speeds.
Aesthetics
In terms of aesthetics, the Thermalright Assassin X 120R SE V2 features a modern design with a self-luminous fan that adds a visual appeal to any build. The height and sleek design complement medium-sized cases. The Noctua NH-L9x65 chromax.Black sports an all-black design, which is visually striking and aligns well with many contemporary builds. Both coolers incorporate design elements that cater to users who appreciate a visually pleasing setup, though they target different styles depending on the user’s preference for colour and form factor.
Which should you buy?
Choosing between the Thermalright Assassin X 120R SE V2 and the Noctua NH-L9x65 chromax.Black ultimately depends on your specific needs and preferences. If you are looking for an affordable, high-performance cooler suitable for a variety of builds, the Thermalright at C$23.59 is an excellent choice. However, if you are working with a compact system and require a premium, ultra-quiet cooler, the Noctua at C$101.95 is worth the investment for its exceptional design and performance. Each cooler has its strengths, making them suited to different types of users and builds.
versusfinder.com is a participant in the Amazon.ca Associates Program. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.

