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

Updated August 2026The Thermalright Peerless Assassin 120 SE ARGB offers superior cooling performance at a lower price, while the Noctua NH-L12S excels in compactness and quiet operation. Choose based on your specific needs.

The Thermalright Peerless Assassin 120 SE ARGB offers superior cooling performance at a lower price, while the Noctua NH-L12S excels in compactness and quiet operation. Choose based on your specific needs.

Why Thermalright Peerless Assassin 120 SE ARGB CPU Air Cooler is better

Price

Thermalright is C$46.90 compared to Noctua's C$87.95.

Cooling Performance

Thermalright has a maximum airflow of 66.17 CFM.

Socket Compatibility

Thermalright supports more AMD socket options.

Why Noctua NH-L12S is better

Size

Noctua is a low-profile cooler at 70mm tall.

Noise Level

Noctua is designed for ultra-quiet operation.

Installation

Noctua features a user-friendly SecuFirm2 mounting system.

Overall score

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

Specifications

SpecThermalright Peerless Assassin 120 SE ARGB CPU Air CoolerNoctua NH-L12S
BrandThermalrightNoctua
Fan RPM1500Low-Noise
Noise Level≤25.6 dB(A)Ultra-quiet
ARGB LightingYesNo
Thermal PasteNot includedIncluded

Dimension comparison

Thermalright Peerless Assassin 120 SE ARGB CPU Air CoolerNoctua NH-L12S

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

When comparing the Thermalright Peerless Assassin 120 SE ARGB and the Noctua NH-L12S, the primary distinction lies in their design and intended use. The Thermalright cooler is priced at C$46.90, while the Noctua model commands a higher price of C$87.95. This price difference reflects their unique features and target audiences, with the Thermalright model aimed at gamers and high-performance enthusiasts, while the Noctua caters to those requiring compact solutions for systems with limited space.

Design and Build Quality

The Thermalright Peerless Assassin 120 SE ARGB features a dual-tower design measuring 125mm x 135mm x 155mm, which allows for robust cooling performance. Its aluminium heat sink and pure copper heat pipes enhance thermal conductivity, making it suitable for CPUs with a TDP of up to 245W. In contrast, the Noctua NH-L12S is a low-profile cooler, standing only 70mm tall, making it ideal for small form factor systems like ITX and HTPC setups. Both coolers are well-constructed but cater to different use cases depending on size and cooling requirements.

Cooling Performance

The Thermalright Peerless Assassin boasts impressive cooling capabilities, thanks to its 6 heat pipes and two PWM fans, which can reach a maximum airflow of 66.17 CFM. With a noise level of only 25.6 dB(A), it operates quietly while providing strong cooling performance. On the other hand, the Noctua NH-L12S, although smaller, utilises a highly optimised NF-A12x15 120mm fan for efficient cooling. It is designed for CPUs with moderate heat loads, making it suitable for a wide range of processors. Each cooler has its strengths, with the Thermalright excelling in raw performance and the Noctua prioritising quiet operation.

Compatibility

Compatibility is a crucial factor when choosing a CPU cooler. The Thermalright Peerless Assassin supports Intel sockets 115X, 1200, 1700, and AMD AM4, making it versatile for many systems. It comes with various mounting options to ensure a secure fit. The Noctua NH-L12S also offers broad compatibility, supporting Intel LGA1851, LGA1700, LGA1200, and LGA115x, as well as AMD AM5 and AM4 sockets. This extensive compatibility allows both coolers to cater to a range of CPUs, but the Thermalright has the edge with more socket options, particularly for AMD users.

Installation Ease

In terms of installation, the Thermalright Peerless Assassin includes metal fasteners and a straightforward mounting system, facilitating a hassle-free installation process. The cooler's design also leaves ample space for RAM, which is beneficial for users concerned about clearance. Conversely, the Noctua NH-L12S is equipped with the SecuFirm2 mounting system, which is known for its easy installation. The inclusion of high-end NT-H1 thermal paste further simplifies setup. While both coolers are designed for easy installation, the Noctua's mounting system is particularly user-friendly due to its offset mounting option, which enhances efficiency.

Aesthetics

Aesthetic appeal is another consideration for many users. The Thermalright Peerless Assassin features ARGB lighting that adds a vibrant look to gaming rigs, appealing to those who enjoy customisable RGB setups. Its dual-fan design not only enhances cooling performance but also elevates the visual appeal. In contrast, the Noctua NH-L12S opts for a more classic appearance with its neutral colour palette. While it may lack the flashy RGB elements, its sleek and professional design fits seamlessly into any build, especially in environments where aesthetics are more subdued.

Pricing

Price can heavily influence purchasing decisions. The Thermalright Peerless Assassin is priced at C$46.90, making it an attractive option for budget-conscious consumers seeking strong performance without breaking the bank. On the other hand, the Noctua NH-L12S comes in at C$87.95, a premium price that reflects its high-quality build and quiet operation. While both products are well-regarded, the price gap suggests that customers should carefully consider their specific needs and whether the additional features of the Noctua justify its higher cost.

Which should you buy?

In conclusion, choosing between the Thermalright Peerless Assassin 120 SE ARGB and the Noctua NH-L12S ultimately depends on your specific requirements. If you prioritise high cooling performance and a vibrant aesthetic at a lower price, the Thermalright cooler is an excellent choice. However, if you need a compact, quiet solution for a small form factor build and are willing to invest a bit more, the Noctua NH-L12S would be the ideal option. Both coolers excel in their respective domains, making either a solid choice based on your individual needs.

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