Noctua NH-L9x65 chromax.Black vs Thermalright Peerless Assassin 120 Digital ARGB
Updated August 2026 — Noctua NH-L9x65 chromax.Black wins on noise level and installation, Thermalright Peerless Assassin 120 Digital ARGB wins on cooling performa and design.
The Noctua NH-L9x65 excels in compactness and quiet operation, while the Thermalright Peerless Assassin 120 offers superior cooling performance at a lower price. Choose based on your specific needs.
Why Noctua NH-L9x65 chromax.Black is better
Compact Size
Ideal for small builds
Quiet Operation
Designed for ultra-quiet performance
Quality Materials
Includes high-end thermal paste
Why Thermalright Peerless Assassin 120 Digital ARGB is better
Cooling Performance
Higher airflow and heat dissipation
Price
More budget-friendly option
Versatile Compatibility
Supports more CPU sockets
Overall score
Specifications
| Spec | Noctua NH-L9x65 chromax.Black | Thermalright Peerless Assassin 120 Digital ARGB |
|---|---|---|
| Fan Speed | N/A | 1850 RPM |
| Heat Pipes | N/A | 6 |
| Socket Compatibility | LGA1851, LGA1700, LGA1200, LGA115x, AM5, AM4 | AM4, AM5, LGA1851, LGA1700, LGA1150, LGA1151, LGA1200 |
| Design | Low-profile | Dual-tower with RGB |
| Installation Ease | Easy | Moderate |
Dimension comparison
Overview of the Noctua NH-L9x65 chromax.Black and Thermalright Peerless Assassin 120 Digital ARGB Black
The Noctua NH-L9x65 chromax.Black is a compact and premium low-profile CPU cooler, while the Thermalright Peerless Assassin 120 Digital ARGB Black is a more traditional air cooler with enhanced features. The Noctua is priced at $79.95, whereas the Thermalright comes in at a more budget-friendly $45.90, making it about 43% cheaper. Both coolers target different user needs, particularly in terms of size and performance.
Design and Build Quality
The Noctua NH-L9x65 chromax.Black boasts a sleek, all-black design that is ideal for home theater PCs and compact builds. With a total height of only 65mm, it fits comfortably in smaller cases without obstructing RAM or PCIe slots. On the other hand, the Thermalright Peerless Assassin 120 is a bulkier cooler, standing at 162mm tall, suitable for mainstream ATX chassis. While the Noctua prioritizes compactness, the Thermalright offers a dual-tower design that enhances heat dissipation through its six heat pipes.
Cooling Performance
When it comes to cooling efficiency, the Noctua NH-L9x65 features a highly optimized NF-A9x14 slim fan, designed for ultra-quiet operation and effective cooling. It is recommended for CPUs with low to moderate heat dissipation, making it a good fit for low-power setups. In contrast, the Thermalright Peerless Assassin 120, with its dual fans and six heat pipes, is engineered for superior heat dissipation, boasting an impressive airflow of 88.89 CFM and a fan speed of up to 1850 RPM. This makes the Thermalright more suitable for high-performance CPUs that produce significantly more heat.
Compatibility
The Noctua NH-L9x65 chromax.Black is compatible with Intel LGA1851, LGA1700, LGA1200, LGA115x, and AMD AM5 & AM4 sockets. Its versatility is impressive for a low-profile cooler, providing solid options for various builds. Meanwhile, the Thermalright Peerless Assassin 120 supports a broader range of CPU sockets, including AM4, AM5, and multiple Intel LGA variants. This extensive compatibility makes the Thermalright a more versatile choice for users with different motherboard setups.
Installation Process
Installation is a breeze with the Noctua NH-L9x65, thanks to its SecuFirm2 mounting system, which ensures a straightforward setup across compatible sockets. The inclusion of high-end NT-H1 thermal paste further enhances the user experience by providing optimal thermal conductivity right out of the box. Conversely, the Thermalright Peerless Assassin 120 also offers a user-friendly installation process, complete with dual-platform mounting clips. However, its larger size may require more careful consideration during installation, particularly in compact cases.
Noise Levels
The Noctua NH-L9x65 is designed for ultra-quiet operation, making it an excellent choice for users who prioritize a silent computing environment. Its low-noise adaptor allows for automatic speed control, keeping noise levels minimal even under load. The Thermalright Peerless Assassin 120, while still relatively quiet, operates at a maximum noise level of 25.6 dB(A), which may be noticeable in quieter environments. Users who value silence may find the Noctua cooler to be the better option.
Aesthetic Appeal
In terms of aesthetics, the Noctua NH-L9x65 chromax.Black offers a sleek and understated look that blends well into most builds, especially those focusing on a minimalist design. Its all-black finish is particularly appealing for modern setups. The Thermalright Peerless Assassin 120, on the other hand, features a more aggressive design with a digital screen top cover and RGB lighting, catering to gamers and those looking to add flair to their builds. The choice here ultimately depends on whether the user prefers a subtle or a more striking visual presence.
Which should you buy?
The decision between the Noctua NH-L9x65 chromax.Black and the Thermalright Peerless Assassin 120 Digital ARGB Black boils down to your specific cooling needs and build constraints. If you're building a compact system or require a cooler that operates quietly, the Noctua may be the ideal choice despite its higher price of $79.95. However, if you need a cooler that can handle more demanding CPUs while staying budget-friendly at $45.90, the Thermalright offers superior cooling performance and versatility. Ultimately, both coolers have unique strengths, and your choice should reflect your priorities in terms of size, noise, and cooling efficiency.

