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

Updated August 2026 — ID-COOLING IS-55 Black CPU Cooler Low Profile wins on noise level and build quality, Thermalright Assassin X 120R Digital ARGB Black wins on aesthetics.

The ID-COOLING IS-55 Black excels in compact builds and quiet operation, while the Thermalright Assassin X 120R offers better performance at a lower price. Choose based on your specific needs.

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

Cooling Performance

ID-COOLING has 5 heat pipes for better heat dissipation.

Noise Levels

ID-COOLING operates quieter at lower RPMs.

Size

ID-COOLING's low-profile design is ideal for compact builds.

Why Thermalright Assassin X 120R Digital ARGB Black is better

Price

Thermalright is significantly cheaper.

Aesthetics

Thermalright features a digital screen for added appeal.

Fan Speed

Thermalright has a higher RPM for potentially better airflow.

Overall score

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

Specifications

SpecID-COOLING IS-55 Black CPU Cooler Low ProfileThermalright Assassin X 120R Digital ARGB Black
CompatibilityIntel LGA 1851/1700/1200/1151/1150/1155/1156, AMD AM5/AM4Intel LGA 1700/1851/1150/1151/1200, AMD AM4/AM5
Fan TypePWM FanPWM Fan
Max RPMN/A2000
Max Airflow54.6 CFMN/A
Noise Range13.8-31.2 dB(A)N/A

Dimension comparison

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

Overview of ID-COOLING IS-55 Black vs. Thermalright Assassin X 120R

In the world of CPU coolers, the ID-COOLING IS-55 Black and the Thermalright Assassin X 120R are two compelling options. With prices of $39.99 and $22.90 respectively, the Thermalright model is about 43% cheaper than the ID-COOLING cooler. Both coolers promise effective thermal management, but they cater to different needs and preferences, making a direct comparison essential for potential buyers.

Design and Aesthetics

The design of a CPU cooler plays a significant role in both functionality and appearance. The ID-COOLING IS-55 Black features a low-profile design with a total height of just 57mm, making it ideal for compact builds such as HTPCs and Mini-ITX systems. In contrast, the Thermalright Assassin X 120R stands taller at 151mm, which may limit its compatibility with smaller cases but allows for more substantial cooling performance. The Assassin X also boasts a digital screen on its top cover, enhancing its aesthetic appeal while providing useful information, unlike the more utilitarian look of the ID-COOLING.

Cooling Performance

When it comes to cooling performance, the ID-COOLING IS-55 Black utilizes five heat pipes and a 120mm PWM fan, ensuring efficient heat dissipation. It claims a maximum airflow of 54.6 CFM with noise levels ranging from 13.8 to 31.2 dB(A), facilitating quiet operation even under load. On the other hand, the Thermalright Assassin X 120R features four heat pipes and a 2000 RPM fan speed, which is optimized for performance. While the specifics on airflow are not provided for this model, the higher RPM suggests it can potentially move more air, making it a strong contender for those needing aggressive cooling.

Compatibility

Compatibility is a crucial factor when choosing a CPU cooler. The ID-COOLING IS-55 Black supports a wide range of Intel and AMD sockets, including Intel LGA 1851/1700/1200/1151/1150/1155/1156 and AMD AM5/AM4. Similarly, the Thermalright Assassin X 120R is compatible with Intel LGA 1700/1851/1150/1151/1200 and AMD AM4/AM5 sockets. Both coolers provide excellent memory compatibility, but the lower profile of the IS-55 may be more appealing to users with limited space, such as those using Mini-ITX motherboards.

Noise Levels

Noise levels can significantly affect the user experience, especially in quiet computing environments. The ID-COOLING IS-55 Black operates at noise levels ranging from 13.8 to 31.2 dB(A), ensuring a relatively quiet operation, particularly at lower RPMs. The Thermalright Assassin X 120R's 2000 RPM fan may produce more noise when running at maximum speed, but its PWM functionality allows for automatic speed adjustments based on temperature, which can help mitigate excessive noise during lighter tasks. Therefore, while the ID-COOLING may have a quieter baseline, the Thermalright offers flexibility based on workload.

Installation Process

Installation can often be a determining factor for buyers assessing CPU coolers. The ID-COOLING IS-55 Black, with its compact size, is designed to be user-friendly, particularly for those building smaller systems. In contrast, the Thermalright Assassin X 120R, while larger, also aims for straightforward installation with its digital screen and software integration for monitoring performance. However, the additional height of the Thermalright model may require more careful consideration of case compatibility and airflow patterns, which could complicate the installation process for some users.

Price Comparison

Price can heavily influence a buyer's decision, and the Thermalright Assassin X 120R offers a significant cost advantage at $22.90, making it about 43% cheaper than the ID-COOLING IS-55 Black, priced at $39.99. For budget-conscious consumers or those looking for a solid performance at a lower price point, the Thermalright model is a compelling choice. On the other hand, the ID-COOLING may justify its price with its superior build quality, additional heat pipes, and lower profile, appealing to users with specific cooling needs or space constraints.

Which should you buy?

Choosing between the ID-COOLING IS-55 Black and the Thermalright Assassin X 120R ultimately depends on your specific needs and preferences. If you're looking for a low-profile cooler that excels in compact builds and operates quietly, the ID-COOLING IS-55 Black is the way to go. However, if you prioritize cost-effectiveness and are okay with a larger cooler that offers robust performance and aesthetic appeal, the Thermalright Assassin X 120R is a strong contender. In the end, both coolers have their merits, and your choice will hinge on your system requirements and budget considerations.