Thermalright Assassin X 120R SE V2 CPU Cooler, 4× vs Thermalright Peerless Assassin 120 SE CPU Cooler,
Updated August 2026 — Thermalright Peerless Assassin 120 SE CPU Cooler, leads on cooling performa and build quality.
The Thermalright Peerless Assassin 120 SE offers superior cooling performance and advanced features, making it the better choice for high-demand users. However, the Assassin X 120R SE V2 is a more budget-friendly option.
Why Thermalright Assassin X 120R SE V2 CPU Cooler, 4× is better
Price
Assassin X is significantly cheaper at $16.59.
Size
Assassin X is more compact, fitting in smaller cases.
Noise
Both have similar noise levels, but Assassin X is quieter under standard loads.
Why Thermalright Peerless Assassin 120 SE CPU Cooler, is better
Cooling
Peerless has six heat pipes for better cooling performance.
Fans
Peerless features dual fans for enhanced airflow.
Build Quality
Peerless uses AGHP technology for improved thermal management.
Overall score
Specifications
| Spec | Thermalright Assassin X 120R SE V2 CPU Cooler, 4× | Thermalright Peerless Assassin 120 SE CPU Cooler, |
|---|---|---|
| Fan Speed | 1550 RPM | 1550 RPM |
| Airflow | 66.17 CFM | 66.17 CFM |
| Noise Level | 25.6 dB(A) | 25.6 dB(A) |
| Socket Support | LGA1150/1151/1155/1156/1200/1700/AM4/AM5 | LGA115X/1200/1700/AM4/AM5 |
| Cooling Tech | 4 Heat Pipes | 6 Heat Pipes AGHP |
Dimension comparison
Price Comparison
The Thermalright Assassin X 120R SE V2 CPU Cooler is priced at $16.59, while the Thermalright Peerless Assassin 120 SE CPU Cooler comes in at $49.99. This makes the Assassin X about 67% cheaper than its counterpart. For budget-conscious consumers, this significant price difference may be a deciding factor, especially for those looking for basic cooling performance without breaking the bank. However, as we’ll explore, this price gap may reflect differences in design and cooling capability that could justify the higher price of the Peerless Assassin.
Design and Build Quality
The design of the Thermalright Assassin X 120R SE V2 features dimensions of 120(L)x71(W)x148(H)mm, which makes it compact and compatible with various cases. It comes equipped with a pure copper base and four 6mm heat pipes, ensuring efficient thermal transfer. In contrast, the Thermalright Peerless Assassin 120 SE is larger, measuring 125(L)x135(W)x155(H)mm, and utilizes six heat pipes with AGHP technology for superior cooling performance. The additional heat pipes and slightly larger size suggest that the Peerless Assassin is designed for more demanding cooling needs, which could be beneficial for overclocking or high-performance setups.
Cooling Performance
In terms of cooling capabilities, the Thermalright Assassin X 120R SE V2 features a fan speed of 1550 RPM, paired with a maximum airflow of 66.17 CFM. Its design is optimized for noise levels of 25.6 dB(A), making it a quiet option for standard builds. On the other hand, the Thermalright Peerless Assassin 120 SE also boasts a fan speed of 1550 RPM and similar airflow, but the six heat pipes and dual fan configuration suggest a more robust cooling solution. This could lead to lower temperatures under load, making the Peerless model more suitable for high-performance CPUs or overclocking scenarios.
Noise Levels
Both models maintain a noise level of up to 25.6 dB(A), ensuring a quiet operation even under load. This is an important aspect for users who prioritize a silent PC environment. The Thermalright Assassin X 120R SE V2 provides efficient cooling while remaining quiet, appealing to casual users who may not push their systems to the limits. The Thermalright Peerless Assassin 120 SE, while also quiet, may excel in situations where enhanced cooling is required, potentially allowing for better thermal management without increasing noise levels.
Compatibility
The Thermalright Assassin X 120R SE V2 supports a wide range of sockets including Intel LGA 1150/1151/1155/1156/1200/1700 and AMD AM4/AM5, making it versatile for many builds. Similarly, the Thermalright Peerless Assassin 120 SE is compatible with Intel LGA 115X/1200/1700 and AMD AM4/AM5 sockets, ensuring it can fit into most modern systems. Both coolers offer corresponding mounting plates for easy installation, but users should verify compatibility with their specific cases and motherboards due to the Peerless’s larger dimensions.
Brand Reputation
Thermalright has established itself as a reputable brand in the CPU cooler market, with over 20 years of development and a strong following among PC enthusiasts. The Assassin X series is well-regarded for delivering value, while the Peerless series aims to provide enhanced performance for gamers and overclockers. While the Thermalright Assassin X 120R SE V2 is popular for its affordability, the Peerless Assassin 120 SE is positioned as a more premium option, appealing to users seeking to push their systems to the limit.
Installation Process
Both the Thermalright Assassin X 120R SE V2 and the Peerless Assassin 120 SE are designed for easy installation. The Assassin X features a straightforward mounting process with metal fasteners for Intel and AMD platforms. The Peerless model also provides the necessary mounting hardware, but users should be aware that it requires the use of the motherboard’s built-in backplane for installation on AMD platforms, which may slightly complicate the process. Nevertheless, both coolers come with instructions that aid in installation, making them accessible for users of varying skill levels.
Which should you buy?
Choosing between the Thermalright Assassin X 120R SE V2 and the Thermalright Peerless Assassin 120 SE ultimately depends on your specific needs and budget. If you are looking for an economical option that provides solid cooling for everyday use, the Assassin X at $16.59 is an excellent choice. However, if you require superior cooling performance for overclocking or high-demand applications, the Peerless Assassin at $49.99 offers advanced features like six heat pipes and a dual fan setup that can significantly enhance thermal management. Consider your usage patterns and whether the additional investment in the Peerless model aligns with your performance expectations.

