Noctua NH-U9S chromax.Black, vs Thermalright Assassin X 120R Digital ARGB Black
Updated August 2026 — Noctua NH-U9S chromax.Black, leads on warranty and build quality.
The Noctua NH-U9S chromax.Black excels in quiet operation and compact design, while the Thermalright Assassin X 120R offers budget-friendly performance with striking aesthetics. Choose based on your priorities.
Why Noctua NH-U9S chromax.Black, is better
Quiet Operation
Noctua is designed for whisper-quiet performance.
Compact Size
Noctua fits in smaller cases without blocking components.
Build Quality
Noctua has a premium build and a longer warranty.
Why Thermalright Assassin X 120R Digital ARGB Black is better
Price
Thermalright is significantly cheaper.
Aesthetics
Thermalright features ARGB lighting for visual appeal.
Cooling Performance
Thermalright has a higher RPM fan for better cooling.
Overall score
Specifications
| Spec | Noctua NH-U9S chromax.Black, | Thermalright Assassin X 120R Digital ARGB Black |
|---|---|---|
| Current Price | $74.95 | $22.90 |
| Fan Speed | N/A | 2000RPM |
| Warranty | 6 years | N/A |
| Installation | Easy | Easy |
| ARGB Lighting | No | Yes |
Dimension comparison
Overview of the Noctua NH-U9S chromax.Black and Thermalright Assassin X 120R
The Noctua NH-U9S chromax.Black is a premium CPU cooler priced at $74.95, while the Thermalright Assassin X 120R is significantly more affordable at $22.90, making it about 69% cheaper. Both coolers offer distinct advantages tailored to different user needs. The Noctua is renowned for its compact design and quiet operation, while the Thermalright provides a striking aesthetic with its ARGB lighting and effective cooling performance at a budget-friendly price.
Design and Aesthetics
In terms of design, the Noctua NH-U9S chromax.Black features a sleek all-black finish that seamlessly integrates into various builds, making it a visually appealing choice for users looking for a subtle yet elegant cooler. On the other hand, the Thermalright Assassin X 120R features a digital screen top cover and ARGB lighting, offering a striking visual impact that can enhance the overall aesthetics of a gaming setup. Users who prioritize aesthetics may find the Thermalright's vibrant lighting and modern design more appealing compared to the understated elegance of Noctua.
Cooling Performance
Cooling performance is a crucial factor when choosing a CPU cooler, and both products excel in this regard. The Noctua NH-U9S chromax.Black utilizes an award-winning NF-A9 92mm fan that operates quietly under load while delivering excellent cooling performance. Conversely, the Thermalright Assassin X 120R features a powerful 2000RPM PWM fan, which can adjust its speed according to the motherboard's temperature, ensuring optimal cooling efficiency. Both coolers are designed to handle high-performance CPUs, but the Thermalright's higher RPM may provide an edge in cooling under heavy loads.
Size and Compatibility
The Noctua NH-U9S chromax.Black is compact, measuring 125mm in height, making it compatible with most tower cases without blocking RAM slots or PCIe slots, even in ITX motherboards. This size advantage is critical for users with limited space. The Thermalright Assassin X 120R, slightly taller at 151mm, still fits most cases but may require more consideration for compatibility. Those with smaller cases might prefer the Noctua for its smaller footprint, while users with more space can take advantage of the Thermalright's larger cooling capacity.
Noise Levels
Noise levels can significantly impact user experience, especially in quiet environments. The Noctua NH-U9S chromax.Black is designed for whisper-quiet operation, making it ideal for users who prioritize low noise. The NF-A9 fan incorporates a Low-Noise Adaptor and PWM functionality to maintain optimal performance without excessive noise. The Thermalright Assassin X 120R, while equipped with noise-reducing features such as silicone corner pads, may not be as quiet as the Noctua due to its higher RPM. Users sensitive to noise may find the Noctua a more suitable choice.
Installation and Ease of Use
Installation is an essential consideration for many users, and both coolers offer straightforward mounting systems. The Noctua NH-U9S chromax.Black comes with a SecuFirm2 mounting system that simplifies installation on various Intel and AMD sockets, ensuring a secure fit. The Thermalright Assassin X 120R also features an easy installation process, accommodating multiple Intel and AMD platforms. However, users may find Noctua's reputation for quality and attention to detail in installation features reassuring, making it a reliable option for those less experienced with cooler installations.
Price Comparison
The price difference between these two coolers is notable, with the Thermalright Assassin X 120R priced at $22.90, which is about 69% less than the Noctua NH-U9S chromax.Black at $74.95. This significant price gap makes the Thermalright an attractive option for budget-conscious users who still want effective cooling performance. However, the Noctua's higher price is justified by its premium build quality, quieter operation, and compact design, appealing to users willing to invest more for superior performance and aesthetics.
Which should you buy?
Choosing between the Noctua NH-U9S chromax.Black and the Thermalright Assassin X 120R ultimately depends on your specific needs and preferences. If you prioritize quiet operation, compact size, and premium quality, the Noctua is the better option despite its higher price. On the other hand, if you are looking for an affordable cooler with good performance and eye-catching aesthetics, the Thermalright Assassin X 120R is an excellent choice. Both coolers have their unique strengths, so consider your priorities before making a decision.

