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Thermalright Peerless Assassin 120 SE CPU Cooler vs Noctua NH-L12S

Updated August 2026The Thermalright Peerless Assassin 120 SE offers better performance at a lower price, while the Noctua NH-L12S excels in compactness and quiet operation.

The Thermalright Peerless Assassin 120 SE offers better performance at a lower price, while the Noctua NH-L12S excels in compactness and quiet operation.

Why Thermalright Peerless Assassin 120 SE CPU Cooler is better

price

C$48.90 vs C$87.95

performance

higher airflow of 66.17 CFM

features

dual high-performance ARGB fans

Why Noctua NH-L12S is better

size

compact 70mm height

noise

quieter operation with Low-Noise Adaptor

installation

SecuFirm2 mounting system for ease

Overall score

Thermalright Peerless Assassin 120 SE CPU Cooler
85
Noctua NH-L12S
78

Specifications

SpecThermalright Peerless Assassin 120 SE CPU CoolerNoctua NH-L12S
PriceC$48.90C$87.95
Airflow66.17 CFMnot specified
Noise Level≤25.6 dB(A)quieter with Low-Noise Adaptor
Socket SupportIntel LGA1150/1151/1155/1156/1200/1700/1851, AMD AM4/AM5Intel LGA1851/1700/1200/115x, AMD AM5/AM4
Fan Speed1550 RPMnot specified

Dimension comparison

Thermalright Peerless Assassin 120 SE CPU CoolerNoctua NH-L12S

Overview of Thermalright Peerless Assassin 120 SE CPU Cooler and Noctua NH-L12S

The Thermalright Peerless Assassin 120 SE and Noctua NH-L12S are two prominent CPU coolers, each catering to different user needs. The Peerless Assassin is priced at C$48.90, while the NH-L12S is a premium option at C$87.95, reflecting their distinct market positions and target users.

The Thermalright model boasts dual high-performance ARGB fans and a dual tower heatsink configuration, making it an attractive option for those seeking enhanced cooling performance and aesthetic appeal. In contrast, the Noctua NH-L12S is a low-profile cooler, ideal for compact ITX and HTPC systems, offering a more subdued approach to cooling while maintaining efficiency.

Design and Build Quality

In terms of design, the Thermalright Peerless Assassin features a robust dual tower heatsink made from aluminum and copper, measuring 125mm x 135mm x 155mm. This design ensures a large surface area for heat dissipation, aided by its six copper heat pipes. The NH-L12S, however, stands out with its compact profile, measuring only 70mm in height, making it easier to fit in tighter spaces without compromising on cooling performance.

Both coolers showcase quality construction, but the Thermalright’s larger dimensions suggest it is geared towards users prioritizing maximum airflow, while the Noctua’s low-profile design appeals to users with space constraints, such as those building small form-factor PCs.

Cooling Performance

Cooling performance is a critical factor when selecting a CPU cooler, and both the Thermalright Peerless Assassin and Noctua NH-L12S deliver commendable results. The Peerless Assassin is equipped with two 120mm fans that can reach speeds of up to 1550 RPM, providing a maximum airflow of 66.17 CFM. This configuration is particularly beneficial for users with high-performance CPUs requiring effective heat dissipation.

On the other hand, the NH-L12S features a highly optimised 120mm fan designed for low noise operation, along with PWM support and a Low-Noise Adaptor. While specific airflow ratings are not provided, its design is aimed at delivering quiet yet effective cooling for CPUs with moderate heat loads. Users looking for a balance between performance and noise levels may find the Noctua to be a more suitable choice.

Noise Levels

Noise output is crucial for users seeking a quiet computing experience. The Thermalright Peerless Assassin operates at a rated noise level of ≤25.6 dB(A), making it relatively quiet, but it may not be as silent as the Noctua NH-L12S. The NH-L12S is engineered to operate quietly, especially with its Low-Noise Adaptor, which allows for automatic speed control that can further minimise noise during operation.

While both coolers aim to provide a quiet environment, enthusiasts prioritising silence will likely lean towards the NH-L12S, especially in compact systems where noise can be more pronounced.

Compatibility

Compatibility is another essential consideration when choosing a CPU cooler. The Thermalright Peerless Assassin supports a wide range of Intel and AMD sockets, including Intel LGA1150, LGA1151, LGA1155, LGA1156, LGA1200, LGA1700, and LGA1851, as well as AMD AM4 and AM5. Users should note that installation on AM4 and AM5 motherboards requires the original motherboard’s built-in backplate.

Conversely, the Noctua NH-L12S also supports a broad array of sockets, including Intel LGA1851, LGA1700, LGA1200, and LGA115x, along with AMD AM5 and AM4. This compatibility ensures that both coolers can cater to many users, though the Thermalright offers slightly broader socket support, which can be advantageous for those with varied system configurations.

Price Point

When it comes to pricing, the Thermalright Peerless Assassin is significantly more affordable at C$48.90 compared to the Noctua NH-L12S, which retails for C$87.95. This price difference of C$39.05 makes the Peerless Assassin an attractive option for budget-conscious consumers or those building entry-level to mid-range systems.

However, the higher price of the Noctua NH-L12S reflects its premium build quality, low-profile design, and focus on quiet operation. Users willing to invest more in their cooling solution may find the added benefits justify the price difference, especially if they require a cooler that excels in compact spaces.

Installation Process

Both the Thermalright Peerless Assassin and Noctua NH-L12S are designed for straightforward installation, though their methods differ slightly. The Peerless Assassin utilises a SS2 install system with a metal pressure plate to ensure optimal contact with the CPU, which should facilitate a smooth installation process for most users.

The Noctua NH-L12S includes the SecuFirm2 mounting system, known for its ease of use and secure fit. This system is particularly beneficial for users who may be less experienced with CPU cooler installations. Overall, while both products offer user-friendly installation, the Noctua might have a slight edge in terms of simplicity.

Which should you buy?

Deciding between the Thermalright Peerless Assassin 120 SE and the Noctua NH-L12S ultimately depends on your specific needs and preferences. If you're looking for a high-performance cooler with robust features at a lower price point, the Thermalright Peerless Assassin is an excellent choice. Its dual fans and larger design make it suitable for high-heat scenarios.

Conversely, if you need a low-profile solution that operates quietly and fits into compact builds, the Noctua NH-L12S is the superior option despite its higher price. It delivers efficient cooling while maintaining a low noise level, making it ideal for users prioritising silence and compactness. Ultimately, evaluate your system requirements, space considerations, and budget to make the best choice for your setup.

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Thermalright Peerless Assassin 120 SE CPU Cooler vs Noctua NH-L12S | versusfinder