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ID-COOLING IS-55 Black CPU Cooler Low Profile vs Thermalright Assassin X 120R Digital ARGB Black

Updated August 2026 — Thermalright Assassin X 120R Digital ARGB Black leads on aesthetics and cooling performa.

The Thermalright Assassin X 120R offers better cooling performance and value for money, while the ID-COOLING IS-55 is ideal for compact builds. Choose based on your specific needs.

Why ID-COOLING IS-55 Black CPU Cooler Low Profile is better

Compact Size

Ideal for small form factor builds.

Low Noise

Operates quieter than Thermalright.

RAM Compatibility

Better compatibility with Mini-ITX motherboards.

Why Thermalright Assassin X 120R Digital ARGB Black is better

Cooling Performance

Higher airflow and heat dissipation.

Price

More budget-friendly option.

Aesthetics

Includes a digital screen for monitoring.

Overall score

ID-COOLING IS-55 Black CPU Cooler Low Profile
75
Thermalright Assassin X 120R Digital ARGB Black
85

Specifications

SpecID-COOLING IS-55 Black CPU Cooler Low ProfileThermalright Assassin X 120R Digital ARGB Black
Heat Pipes54
Max RPMN/A2000
Noise Level13.8-31.2 dB(A)≤ 29.8 dB(A)
CompatibilityIntel/AMDIntel/AMD
Price$39.99$24.90

Dimension comparison

ID-COOLING IS-55 Black CPU Cooler Low ProfileThermalright Assassin X 120R Digital ARGB Black

Introduction

When it comes to CPU coolers, two notable contenders are the ID-COOLING IS-55 Black and the Thermalright Assassin X 120R Digital. Each offers distinct features tailored for different user needs, making them worthy of comparison. The ID-COOLING IS-55 is currently priced at $39.99, while the Thermalright Assassin X 120R is available for $24.90, making it about 38% cheaper. This article will delve into their specifications, design, cooling performance, noise levels, compatibility, and aesthetics to help you decide which cooler is right for you.

Design and Build Quality

The ID-COOLING IS-55 features a low-profile design with a total height of 57mm, making it ideal for compact builds such as HTPCs and small form factors. Its slim profile allows for excellent RAM compatibility, particularly on Mini-ITX motherboards. In contrast, the Thermalright Assassin X 120R boasts a more traditional tower design with a height of 151mm, providing a larger surface area for heat dissipation. This makes it suitable for most cases without sacrificing performance. While the ID-COOLING is compact and discreet, the Thermalright includes a digital screen top cover, enhancing its aesthetic appeal and functionality.

Cooling Performance

In terms of cooling performance, the ID-COOLING IS-55 utilizes five heat pipes and a 120mm PWM fan that delivers a maximum air flow of 54.6 CFM, which is quite effective for its size. Its noise level ranges from 13.8 to 31.2 dB(A), ensuring a quiet operation. On the other hand, the Thermalright Assassin X 120R features a more powerful 120mm fan that can reach speeds of up to 2000 RPM, generating an air volume of 70.84 CFM. This cooler also offers a maximum noise level of 29.8 dB(A). Therefore, while both coolers excel in heat dissipation, the Thermalright has a clear edge in airflow and performance, especially in larger builds.

Noise Levels

Noise is a crucial factor for many PC builders. The ID-COOLING IS-55 operates quietly, with a noise level that varies between 13.8 and 31.2 dB(A), depending on the fan speed. This makes it an excellent choice for users who prioritize silence. Meanwhile, the Thermalright Assassin X 120R produces a maximum noise level of 29.8 dB(A) at full speed. Although it is slightly louder than the ID-COOLING, it still falls within an acceptable range for most users. If you are looking for a cooler that operates quietly under load, the ID-COOLING may be the better option.

Compatibility

Both coolers are designed to be compatible with a wide range of Intel and AMD sockets. The ID-COOLING IS-55 supports Intel LGA 1851/1700/1200/1151/1150/1155/1156 and AMD AM5/AM4 sockets, making it versatile for various builds. The Thermalright Assassin X 120R offers compatibility with Intel LGA 1851/1700/1150/1151/1155/1156/1200 and AMD AM4/AM5 sockets as well. However, the Thermalright also features an installation accessory that simplifies the setup process, which may be beneficial for users who are less experienced with hardware installation. Overall, both coolers provide excellent compatibility, but the Thermalright offers an additional edge in ease of installation.

Aesthetics and Additional Features

Aesthetics play a significant role in many builds, and the Thermalright Assassin X 120R shines with its digital screen top cover. This feature not only enhances the cooler's appearance but also allows users to monitor CPU temperature and usage. The ID-COOLING IS-55, while functional, lacks such aesthetic enhancements and focuses more on a minimalist design. If visual appeal and additional monitoring features are important to you, the Thermalright Assassin X 120R is the superior choice.

Price and Value

The ID-COOLING IS-55 is priced at $39.99, whereas the Thermalright Assassin X 120R comes in at a more budget-friendly $24.90. This price difference of about $15.09 means that the Thermalright is approximately 38% cheaper than the ID-COOLING. Given the features and performance of both coolers, the Thermalright offers excellent value for money, especially for users seeking a reliable cooler without breaking the bank.

User Experience and Feedback

While both products have not disclosed specific user feedback or sales rankings, it's essential to consider the overall user experience when selecting a CPU cooler. The ID-COOLING IS-55 is often praised for its compactness and low noise levels, making it a favorite among users with small form factor builds. Conversely, the Thermalright Assassin X 120R is recognized for its robust cooling capabilities and stylish design, appealing to those who want both performance and aesthetics. Ultimately, user preferences will play a significant role in determining which cooler resonates more with their needs.

Which should you buy?

In conclusion, both the ID-COOLING IS-55 Black CPU Cooler and the Thermalright Assassin X 120R Digital offer compelling features tailored to different user needs. The ID-COOLING is ideal for compact builds and those who prioritize low noise, while the Thermalright excels in cooling performance, aesthetics, and value for money. Ultimately, if budget is a significant concern, the Thermalright Assassin X 120R, priced at $24.90, stands out as the better choice, offering superior airflow and additional features. However, if you need a low-profile solution for tight spaces, the ID-COOLING IS-55 remains a solid option.