Thermalright Assassin King 120 SE White ARGB CPU vs Thermalright Assassin X 120R Digital ARGB Black
Updated August 2026 — Thermalright Assassin King 120 SE White ARGB CPU wins on noise level, Thermalright Assassin X 120R Digital ARGB Black wins on aesthetics and cooling performa.
The Thermalright Assassin X 120R offers superior cooling performance and advanced features compared to the Assassin King 120 SE. However, the Assassin King is more budget-friendly.
Why Thermalright Assassin King 120 SE White ARGB CPU is better
Price
Assassin King is $19.82, cheaper than Assassin X at $22.90.
Noise Level
Assassin King operates at a lower noise level of ≤25.6 dB(A).
Weight
Assassin King weighs 0.64 kg, lighter than Assassin X.
Why Thermalright Assassin X 120R Digital ARGB Black is better
Cooling Performance
Assassin X has a higher fan speed of 2000 RPM.
Build Quality
Assassin X features nickel-plated anti-oxidation heat pipes.
Features
Assassin X includes a digital screen for enhanced user interaction.
Overall score
Specifications
| Spec | Thermalright Assassin King 120 SE White ARGB CPU | Thermalright Assassin X 120R Digital ARGB Black |
|---|---|---|
| Heat Pipes | 5 | 4 |
| Airflow | 66.17 CFM | N/A |
| Noise Level | ≤25.6 dB(A) | N/A |
| Socket Support | Intel 115X/1200/1700/17XX/1851, AMD AM4 | Intel LGA1700/1851/1150/1151/1200, AMD AM4/AM5 |
| ARGB Lighting | Yes | Yes |
Dimension comparison
Overview of the Products
The Thermalright Assassin King 120 SE White ARGB CPU Air Cooler is priced at $19.82, while the Thermalright Assassin X 120R Digital ARGB Black CPU Air Cooler costs $22.90. This makes the Assassin King about 17% cheaper than the Assassin X. Both products are designed to efficiently cool CPUs, but they come with different features and specifications that cater to varying user preferences.
Design and Aesthetics
The design of the Thermalright Assassin King 120 SE White ARGB features a sleek white finish with ARGB lighting effects that can enhance the look of any build. It measures 120mm in length, 73mm in width, and 148mm in height. On the other hand, the Thermalright Assassin X 120R Digital ARGB sports a black finish with a digital screen top cover, giving it a modern and sophisticated appearance. With an overall height of 151mm, it fits into most cases without compromising on performance. The visual appeal of both coolers is strong, but the digital display of the Assassin X adds a unique touch that may attract users looking for aesthetics beyond just cooling performance.
Cooling Performance
The cooling performance of the Thermalright Assassin King is supported by its 5 heat pipes, which utilize AGHP III technology. This cooler operates with a fan speed of 1550 RPM, providing a maximum airflow of 66.17 CFM while maintaining a noise level of ≤25.6 dB(A). Conversely, the Assassin X features a 2000 RPM fan speed, which delivers improved cooling efficiency, particularly under load. Although the Assassin King is effective, the higher RPM and advanced AGHP technology of the Assassin X suggest that it can handle more demanding thermal environments, making it potentially more suitable for overclocking scenarios.
Noise Levels
When it comes to noise levels, the Thermalright Assassin King is designed to operate quietly, with a maximum noise level of 25.6 dB(A). This low noise level is ideal for users who prioritize a silent computing environment. The Assassin X, while also designed to minimize noise, features a fan speed of 2000 RPM, which may lead to slightly increased noise during heavy usage. However, the use of silicone corner pads on the Assassin X helps mitigate vibrations and noise, ensuring that it remains a quiet option despite its higher RPM.
Compatibility
Both coolers boast broad compatibility with various CPU sockets. The Thermalright Assassin King supports Intel sockets 115X/1200/1700/17XX/1851 and AMD AM4. Similarly, the Assassin X is compatible with Intel LGA1700/1851/1150/1151/1200 and AMD AM4/AM5. This means users can easily install either cooler on a wide range of modern CPUs, making them versatile choices for many system builds. However, the inclusion of specific mounting hardware for each socket type is essential, and both products offer adequate solutions for installation.
Build Quality
The build quality of both coolers reflects Thermalright's commitment to durability and performance. The Assassin King utilizes aluminum for its heatsink and features S-FDB bearings in its fan for long-lasting performance. It weighs approximately 0.64 kg (1.4 lb), which indicates that it is robust yet lightweight. The Assassin X also employs high-quality materials, including PBT and PC for the fan's construction, which enhances its durability. The use of nickel-plated anti-oxidation heat pipes further improves the longevity of the Assassin X, suggesting a strong emphasis on build quality across both products.
Features and Technology
In terms of features, the Thermalright Assassin King is straightforward with its effective ARGB lighting and PWM fan technology, offering a good balance between cooling and aesthetics. The Assassin X, however, is equipped with a digital screen that displays relevant information, enhancing user interaction. Additionally, it features ARGB synchronization with the motherboard, allowing for customizable lighting options. These extra features on the Assassin X may appeal to users who enjoy more control over their cooling solutions and aesthetics.
Which should you buy?
Choosing between the Thermalright Assassin King 120 SE White ARGB and the Thermalright Assassin X 120R Digital ARGB ultimately depends on your specific needs. If you are looking for a more budget-friendly option that still provides solid cooling performance, the Assassin King is a great choice at $19.82. However, if you prioritize enhanced cooling efficiency, advanced features, and a modern aesthetic, the Assassin X at $22.90 may be worth the additional investment. Each cooler has its strengths, so consider your usage scenario and personal preferences when making a decision.

