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ID-COOLING IS-55 Black CPU Cooler Low Profile vs Thermalright Peerless Assassin 120 SE V3 CPU Air

Updated August 2026 — ID-COOLING IS-55 Black CPU Cooler Low Profile wins on size, Thermalright Peerless Assassin 120 SE V3 CPU Air wins on cooling performa and noise level.

The Thermalright Peerless Assassin 120 SE V3 offers superior cooling performance and broader compatibility at a lower price, making it the better choice overall.

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

Compact Design

Ideal for small builds

Quieter Operation

Lower noise levels

RAM Compatibility

Better fit for tight spaces

Why Thermalright Peerless Assassin 120 SE V3 CPU Air is better

Cooling Performance

Higher airflow and cooling capacity

Price

Lower cost for better performance

Dual Fans

Enhanced cooling efficiency

Overall score

ID-COOLING IS-55 Black CPU Cooler Low Profile
75
Thermalright Peerless Assassin 120 SE V3 CPU Air
85

Specifications

SpecID-COOLING IS-55 Black CPU Cooler Low ProfileThermalright Peerless Assassin 120 SE V3 CPU Air
Max Airflow54.6 CFM70.84 CFM
Max Noise31.2 dB(A)29.8 dB(A)
Fan RPMN/A2000 RPM
CompatibilityIntel LGA 1851/1700/1200; AMD AM4/AM5Intel LGA 1851/1700/1150/1151/1200; AMD AM4/AM5
Price$39.99$35.90

Dimension comparison

ID-COOLING IS-55 Black CPU Cooler Low ProfileThermalright Peerless Assassin 120 SE V3 CPU Air

Overview of the ID-COOLING IS-55 Black and Thermalright Peerless Assassin 120 SE V3

The ID-COOLING IS-55 Black CPU Cooler is priced at $39.99, while the Thermalright Peerless Assassin 120 SE V3 comes in slightly cheaper at $35.90, making it about 17% less expensive. These two coolers are designed for different types of builds and user needs, catering to both compact systems and high-performance setups. This comparison will delve into their features, performance, and overall value to help you decide which cooler is best for your needs.

Design and Build Quality

The ID-COOLING IS-55 Black features a low-profile design with a total height of 57mm, making it ideal for HTPCs and small form factor builds. Its compact size is complemented by a robust construction that includes five heat pipes to ensure effective heat dissipation. On the other hand, the Thermalright Peerless Assassin 120 SE V3 adopts a dual-tower design with two 120mm PWM fans. This setup not only enhances cooling efficiency but also adds a more sophisticated aesthetic to your build. Both coolers are well-constructed; however, the choice between them will depend on your case size and cooling requirements.

Cooling Performance

In terms of cooling performance, the ID-COOLING IS-55 Black employs a 120mm PWM fan that can deliver a maximum airflow of 54.6 CFM, operating at a noise level of 13.8-31.2 dB(A). This cooler is designed for quieter operation, which is beneficial for users who value low noise levels. Conversely, the Thermalright Peerless Assassin 120 SE V3 is equipped with dual 120mm fans capable of reaching up to 2000 RPM, resulting in a higher airflow of 70.84 CFM. It operates at a maximum noise level of 29.8 dB(A), which is slightly louder than the ID-COOLING cooler. If you are looking for superior cooling capacity, the Peerless Assassin may be the better choice.

Compatibility

Compatibility is a crucial factor when choosing a CPU cooler. The ID-COOLING IS-55 Black is compatible with Intel LGA 1851, 1700, 1200, and AMD AM4/AM5 sockets. Its low-profile design also allows it to fit into tight spaces without interfering with RAM clearance. In contrast, the Thermalright Peerless Assassin 120 SE V3 offers a broader compatibility range, supporting Intel's latest LGA 1851 and 1700 sockets as well as AMD's AM4 and AM5. This makes the Peerless Assassin a versatile option for users with newer hardware. Both coolers come with mounting accessories for easy installation.

Noise Levels

Noise levels can significantly impact the user experience in a PC build. The ID-COOLING IS-55 Black operates quite quietly, with a maximum noise level of 31.2 dB(A). This makes it suitable for users who prioritize a silent operation, such as those working in noise-sensitive environments. The Thermalright Peerless Assassin 120 SE V3, while louder at a maximum of 29.8 dB(A), compensates with its higher cooling performance. If noise is your primary concern, the ID-COOLING cooler will likely be more appealing.

Price and Value

The ID-COOLING IS-55 Black is priced at $39.99, while the Thermalright Peerless Assassin 120 SE V3 is available for $35.90. This price difference of $4.09 makes the Peerless Assassin about 10% cheaper. Given that both products offer excellent features, users might find the lower price of the Thermalright cooler provides better value, especially considering its higher performance metrics. However, the ID-COOLING cooler's design and quieter operation might justify its higher price for specific use cases.

User Experience and Installation

User experience can vary based on installation ease and overall satisfaction with the product. The ID-COOLING IS-55 Black's low-profile design and included mounting accessories make it relatively easy to install. It's particularly appealing for those building compact systems. The Thermalright Peerless Assassin 120 SE V3 also comes with mounting accessories but may require a bit more space due to its dual-tower design. Both coolers are designed to facilitate straightforward installation, but the ID-COOLING may win out in the ease-of-installation category for smaller builds.

Which should you buy?

Choosing between the ID-COOLING IS-55 Black and the Thermalright Peerless Assassin 120 SE V3 ultimately comes down to your specific needs. If you're working with a compact build and require a cooler that operates quietly, the ID-COOLING IS-55 Black is an excellent choice thanks to its low-profile design and efficient cooling capabilities. However, if you prioritize higher cooling performance and broader compatibility, the Thermalright Peerless Assassin 120 SE V3 stands out as the better value option, especially given its lower price point. Each cooler has its strengths, so consider your unique requirements before making a decision.