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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.

The Thermalright Assassin X 120R offers superior cooling performance and features, making it the better choice for high-performance builds, while the Assassin King is a more budget-friendly option.

Why Thermalright Assassin King 120 SE White ARGB CPU is better

Price

Assassin King is $19.82, cheaper than Assassin X at $24.90.

Noise Level

Assassin King operates at 25.6 dB(A), quieter than Assassin X at 29.8 dB(A).

Weight

Assassin King weighs 0.64kg, lighter than Assassin X at 0.75kg.

Why Thermalright Assassin X 120R Digital ARGB Black is better

Cooling Efficiency

Assassin X has a fan speed of 2000 RPM, higher than Assassin King's 1550 RPM.

Airflow

Assassin X provides 70.84 CFM, more than Assassin King's 66.17 CFM.

Digital Display

Assassin X features a digital screen for real-time monitoring, unlike Assassin King.

Overall score

Thermalright Assassin King 120 SE White ARGB CPU
75
Thermalright Assassin X 120R Digital ARGB Black
85

Specifications

SpecThermalright Assassin King 120 SE White ARGB CPUThermalright Assassin X 120R Digital ARGB Black
Price$19.82$24.90
Airflow66.17 CFM70.84 CFM
Noise Level25.6 dB(A)29.8 dB(A)
CompatibilityLGA 115X/1200/1700, AM4LGA 1851/1700/115X/1200, AM4/AM5
Fan TypePWMPWM

Dimension comparison

Thermalright Assassin King 120 SE White ARGB CPUThermalright Assassin X 120R Digital ARGB Black

Price Comparison

When it comes to price, the Thermalright Assassin King 120 SE White ARGB CPU Air Cooler is priced at $19.82, making it about 17% cheaper than the Thermalright Assassin X 120R Digital ARGB Black CPU Cooler, which retails for $24.90. This price difference may make the Assassin King a more appealing option for budget-conscious consumers or those looking to invest in a good cooling solution without breaking the bank.

The lower price of the Assassin King could attract users who need reliable cooling performance for their builds without requiring advanced features like digital displays or enhanced aesthetics.

Design and Aesthetics

The Thermalright Assassin King 120 SE boasts a sleek white design with ARGB lighting, providing a visually appealing addition to any build. In contrast, the Thermalright Assassin X 120R features a black finish and a digital screen top cover that displays real-time CPU and GPU temperatures, adding a modern touch.

While both products support ARGB lighting, the Assassin X's digital screen offers a functional aesthetic that provides useful information at a glance. This might appeal to users who value both performance and visual feedback in their cooling solutions.

Performance and Cooling Efficiency

In terms of performance, the Assassin King features a fan speed of 1550 RPM with a maximum airflow of 66.17 CFM, while the Assassin X offers a higher fan speed of 2000 RPM and a maximum airflow of 70.84 CFM. This means that the Assassin X is designed to provide better cooling efficiency, which is particularly beneficial for users with high-performance CPUs or those who plan to overclock.

The increased airflow and fan speed of the Assassin X could translate to lower temperatures under load, making it a more suitable option for gamers and professionals who need optimal cooling performance.

Compatibility

Both coolers have broad compatibility with various CPU sockets. The Assassin King supports Intel LGA 115X/1200/1700 and AMD AM4, while the Assassin X expands compatibility to include additional Intel sockets such as LGA 1851 and AMD AM5.

The Assassin X's wider compatibility may be a deciding factor for users with newer CPUs or those looking to upgrade in the near future. This flexibility can make the Assassin X a more future-proof choice compared to the Assassin King.

Noise Levels

Noise levels are an important consideration for many PC builders, particularly for those who prioritize quiet operation. The Thermalright Assassin King operates at a noise level of 25.6 dB(A), which is relatively quiet. Meanwhile, the Assassin X has a slightly higher operational noise level of 29.8 dB(A).

For users who are sensitive to noise, the Assassin King may be the better option, providing effective cooling while minimizing sound output. However, the difference in noise levels might not be significant enough to deter users focused more on performance.

Installation and User Experience

Both products are designed for easy installation, with the Assassin King coming with mounting hardware for both Intel and AMD platforms. The Assassin X also includes installation accessories and notes that users might need to utilize the motherboard's original backplate for AMD installations.

The added digital screen on the Assassin X enhances user experience by providing real-time temperature data, which can be particularly helpful for monitoring system performance. This feature can significantly benefit users who are keen on maintaining optimal operating conditions.

Customer Support and Brand Reputation

Thermalright has built a solid reputation over its 20 years in the industry, known for producing reliable cooling solutions. Both products come with customer support, ensuring that users can seek assistance if needed. The brand's longevity and experience in the market provide confidence for consumers in their purchasing decisions.

The positive reputation of Thermalright can be a significant factor for those who prioritize brand reliability and customer service when choosing between these two coolers.

Which should you buy?

Choosing between the Thermalright Assassin King 120 SE White ARGB CPU Air Cooler and the Thermalright Assassin X 120R Digital ARGB Black CPU Cooler ultimately comes down to your specific needs and preferences. The Assassin King is a more budget-friendly option, offering solid performance and quieter operation, making it ideal for users seeking an efficient and cost-effective cooler.

On the other hand, the Assassin X, while at a higher price point, brings enhanced cooling capabilities, a modern digital display, and broader compatibility, making it more suitable for high-performance builds or users looking for advanced features. If you prioritize aesthetics and performance, the Assassin X is the way to go, but for those looking to save money while still getting good performance, the Assassin King is an excellent choice.