Thermalright Peerless Assassin 120 SE CPU Air Cooler vs Noctua NH-U12S redux
Updated August 2026 — The Thermalright Peerless Assassin 120 SE offers excellent value for budget-conscious users, while the Noctua NH-U12S redux excels in build quality and quiet operation.
The Thermalright Peerless Assassin 120 SE offers excellent value for budget-conscious users, while the Noctua NH-U12S redux excels in build quality and quiet operation.
Why Thermalright Peerless Assassin 120 SE CPU Air Cooler is better
affordable price
Thermalright is priced at £26.90.
cooling performance
Thermalright has a higher airflow of 66.17 CFM.
compatibility
Thermalright supports a wider range of Intel sockets.
Why Noctua NH-U12S redux is better
build quality
Noctua is known for its premium materials.
noise levels
Noctua operates near-silent at idle.
installation ease
Noctua includes the SecuFirm2 mounting system.
Overall score
Specifications
| Spec | Thermalright Peerless Assassin 120 SE CPU Air Cooler | Noctua NH-U12S redux |
|---|---|---|
| Price | £26.90 | £65.68 |
| Max RPM | 1550 | 1700 |
| Airflow | 66.17 CFM | Not specified |
| Noise Level | ≤25.6 dB(A) | Near-silent |
| Socket Types | LGA1150-1851, AM4/AM5 | LGA115x, AM4/AM5 |
Dimension comparison
Overview of Thermalright Peerless Assassin 120 SE and Noctua NH-U12S redux
When comparing the Thermalright Peerless Assassin 120 SE and the Noctua NH-U12S redux, two standout CPU air coolers, it's essential to consider their features, pricing, and brand reputation. The Thermalright model is priced at £26.90, making it significantly more affordable than the Noctua, which retails for £65.68. Both brands have established themselves in the cooling market, but they cater to slightly different user needs and preferences.
Design and Build Quality
The Thermalright Peerless Assassin 120 SE features a double tower cooling design, which allows for enhanced cooling performance. With dimensions of 125mm x 135mm x 155mm and a weight of 0.97kg, it is designed to fit various cases while leaving ample room for RAM. On the other hand, the Noctua NH-U12S redux stands at a slim 158mm tall, ensuring compatibility with most tower cases without overhanging RAM slots or blocking PCIe slots. Both coolers utilise high-quality materials, with Thermalright employing aluminium and copper, while Noctua is known for its robust build, enhancing durability.
Cooling Performance
In terms of cooling performance, the Thermalright Peerless Assassin 120 SE employs six heat pipes and two PWM fans that can spin at a maximum speed of 1550 RPM, delivering an airflow of 66.17 CFM while maintaining a noise level of ≤25.6 dB(A). This setup aims to provide excellent thermal dissipation and low noise levels, especially under load. Conversely, the Noctua NH-U12S redux also focuses on quiet operation, featuring an NF-P12 redux-1700 fan that adjusts its speed automatically. Although specific airflow numbers are not provided for the Noctua, its design has been acclaimed for maintaining performance while remaining near-silent at idle.
Compatibility and Installation
Both coolers boast broad compatibility with various CPU sockets. The Thermalright Peerless Assassin 120 SE supports Intel sockets LGA1150 through LGA1851 and AMD AM4 and AM5, making it versatile for different builds. In comparison, the Noctua NH-U12S redux is compatible with Intel LGA115x, LGA1200, LGA1700, and LGA1851, as well as AMD AM4 and AM5 sockets. This wide range of compatibility ensures that both coolers can serve a diverse audience. The Noctua cooler also includes the SecuFirm2 mounting system, which is noted for making installation straightforward.
Noise Levels
When it comes to noise levels, the Thermalright Peerless Assassin 120 SE operates at a maximum noise level of 25.6 dB(A), positioning it as a quiet option for users seeking peace during operation. The Noctua NH-U12S redux is reputed for its near-silent performance, particularly at idle. While specific decibel levels are not disclosed, Noctua's fan technology is designed to minimise noise while maintaining cooling efficiency. This aspect is crucial for users who prioritise a quiet computing environment, especially in home or office settings.
Cooling Technology
The Thermalright Peerless Assassin 120 SE employs advanced technologies such as the AGHP technique, which helps mitigate the inverse gravity effect during operation. This design feature, combined with its six heat pipes, aims to enhance heat dissipation effectively. In contrast, the Noctua NH-U12S redux leverages its award-winning design, which has been optimised for better airflow and cooling efficiency. While both coolers are effective, the specific technology behind their cooling performance varies and may appeal to different users based on their cooling needs.
Pricing
Pricing is a significant differentiator between these two coolers. The Thermalright Peerless Assassin 120 SE is priced at £26.90, making it an attractive option for budget-conscious consumers looking for solid cooling performance without breaking the bank. On the other hand, the Noctua NH-U12S redux comes at a higher price point of £65.68, reflecting its premium build quality and brand reputation. This difference in pricing may influence buyers, particularly those who are willing to invest more for perceived quality and performance.
Which should you buy?
In summary, the choice between the Thermalright Peerless Assassin 120 SE and the Noctua NH-U12S redux largely depends on your specific needs and budget. If you're looking for an affordable solution with robust cooling performance and broad compatibility, the Thermalright Peerless Assassin 120 SE is an excellent choice. However, if you prioritise premium build quality, advanced cooling technology, and ultra-quiet operation, the Noctua NH-U12S redux may justify its higher price. Ultimately, both coolers offer unique advantages that cater to different user preferences in the CPU cooling market.
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