ARCTIC Liquid Freezer III Pro 240 A-RGB - vs Thermalright Peerless Assassin 120 SE CPU Cooler,
Updated August 2026 — ARCTIC Liquid Freezer III Pro 240 A-RGB - leads on aesthetics and build quality.
The ARCTIC Liquid Freezer III Pro offers superior cooling performance and aesthetics, while the Thermalright Peerless Assassin is a budget-friendly option. Overall, the ARCTIC cooler is the better choice for high-performance needs.
Why ARCTIC Liquid Freezer III Pro 240 A-RGB - is better
Cooling Performance
Liquid cooling generally outperforms air cooling in high-demand scenarios.
Design
Sleek design with RGB lighting appeals to modern builds.
Noise Levels
Operates quieter under load compared to air coolers.
Why Thermalright Peerless Assassin 120 SE CPU Cooler, is better
Price
More affordable option at $49.99.
Installation
Easier installation for users familiar with air coolers.
Brand Reputation
Well-regarded in the air cooling market.
Overall score
Specifications
| Spec | ARCTIC Liquid Freezer III Pro 240 A-RGB - | Thermalright Peerless Assassin 120 SE CPU Cooler, |
|---|---|---|
| Cooling Type | Liquid | Air |
| Fan Speed | PWM | 1550 RPM |
| Socket Support | LGA1851/AM5 | LGA1700/AM4 |
| Noise Level | Quiet | 25.6 dB(A) |
| RGB Lighting | Yes | No |
Dimension comparison
Overview of the ARCTIC Liquid Freezer III Pro 240 A-RGB and Thermalright Peerless Assassin 120 SE
The ARCTIC Liquid Freezer III Pro 240 A-RGB is a 240 mm AIO CPU cooler, while the Thermalright Peerless Assassin 120 SE is a robust air cooler equipped with 6 heat pipes. Priced at $80.00, the ARCTIC cooler offers advanced water cooling features, whereas the Thermalright model costs $49.99, making it about 37% cheaper than its counterpart. Both products target users seeking efficient cooling solutions for their CPUs, yet they employ different cooling technologies that may appeal to various user preferences.
Cooling Performance
The ARCTIC Liquid Freezer III Pro 240 A-RGB features a PWM pump and integrated VRM fan that actively cools voltage converters, contributing to its superior cooling performance under high load. This model is designed for optimized contact pressure distribution, which enhances heat dissipation and prolongs CPU lifespan. In contrast, the Thermalright Peerless Assassin 120 SE employs 6 heat pipes and dual 120mm PWM fans, achieving a maximum speed of 1550 RPM and an airflow of 66.17 CFM. While both coolers aim for effective thermal management, the ARCTIC's liquid cooling technology generally provides better performance in more demanding scenarios.
Installation and Compatibility
The ARCTIC Liquid Freezer III Pro 240 A-RGB is designed for compatibility with a wide range of Intel and AMD sockets, including LGA1851 and AM5/AM4. Its native offset mounting ensures efficient heat transfer to the CPU hotspot. Conversely, the Thermalright Peerless Assassin 120 SE also supports multiple sockets, including Intel LGA 1700 and AMD AM4/AM5, but it requires the original motherboard's backplane for installation, which may complicate setup for some users. The ease of installation could be a deciding factor, as the ARCTIC cooler’s design allows for a cleaner build with integrated cable management.
Noise Levels
In terms of noise output, the ARCTIC Liquid Freezer III Pro 240 A-RGB is designed to operate quietly, particularly at low speeds, thanks to its P12 Pro fans. This cooler is optimized for performance without the excessive noise that can accompany high cooling demand. The Thermalright Peerless Assassin 120 SE boasts a noise level of 25.6 dB(A), which is relatively quiet for an air cooler. However, the liquid cooling solution of the ARCTIC unit generally tends to run quieter under similar loads, making it potentially more suitable for users who prioritize a silent PC experience.
Aesthetics and Design
The ARCTIC Liquid Freezer III Pro 240 A-RGB features a sleek black design with RGB lighting, appealing to gamers and builders looking to enhance the visual aesthetics of their rigs. Its modern look can complement various build styles while providing functional cooling. On the other hand, the Thermalright Peerless Assassin 120 SE has a more traditional design that may appeal to users who prefer a classic look. While both coolers offer solid performance, the visual appeal of the ARCTIC cooler might attract users interested in RGB lighting and modern aesthetics.
Brand Reputation
ARCTIC has built a reputation for quality cooling solutions, particularly in the water cooling segment. The Liquid Freezer III Pro has garnered positive feedback for its performance and innovative features. Thermalright, with over 20 years of experience, is well-regarded in the air cooling market, especially in regions where it has a strong following. Both brands are known for their reliability, but ARCTIC's focus on advanced cooling technologies may give it an edge in performance-oriented communities.
Price Comparison
At $80.00, the ARCTIC Liquid Freezer III Pro 240 A-RGB is positioned as a premium product in the CPU cooler market. In contrast, the Thermalright Peerless Assassin 120 SE is available for $49.99, making it a more budget-friendly option. This price difference of about $30 could be significant for users on a tighter budget. However, potential buyers should consider whether the additional features and performance of the ARCTIC cooler justify the higher cost in their specific use case.
Which should you buy?
Choosing between the ARCTIC Liquid Freezer III Pro 240 A-RGB and the Thermalright Peerless Assassin 120 SE ultimately depends on your individual needs and preferences. If you prioritize high-performance cooling, a sleek design, and are willing to invest more for a premium liquid cooling solution, the ARCTIC cooler is an excellent choice. However, if you are looking for a more affordable, reliable air cooler that still offers solid performance, the Thermalright model is a compelling option. Consider your budget, aesthetic preferences, and cooling demands to make the best decision for your setup.

