Thermalright Peerless Assassin 140 Black CPU Cooler vs Noctua NH-L12S
Updated August 2026 — The Thermalright Peerless Assassin 140 Black offers superior cooling performance at a lower price, while the Noctua NH-L12S excels in compactness and quiet operation.
The Thermalright Peerless Assassin 140 Black offers superior cooling performance at a lower price, while the Noctua NH-L12S excels in compactness and quiet operation.
Why Thermalright Peerless Assassin 140 Black CPU Cooler is better
price
C$54.90 vs C$87.95
cooling performance
dual fans with 66.17 CFM airflow
height
158mm suitable for larger cases
Why Noctua NH-L12S is better
compact design
70mm height ideal for small builds
thermal paste included
comes with NT-H1 thermal paste
quiet operation
designed for ultra-quiet performance
Overall score
Specifications
| Spec | Thermalright Peerless Assassin 140 Black CPU Cooler | Noctua NH-L12S |
|---|---|---|
| Price (CAD) | C$54.90 | C$87.95 |
| Fan Speed (RPM) | 1500 | 1200 |
| Noise Level (dB) | ≤25.6 | not specified |
| Socket Compatibility | LGA1150/1151/1155/1156/1200/1700/AM4/AM5 | LGA115x/1700/AM4/AM5 |
| Cooling Type | Air | Air |
Dimension comparison
Price Comparison
The Thermalright Peerless Assassin 140 Black is priced at C$54.90, making it significantly more affordable than the Noctua NH-L12S, which retails for C$87.95. This price difference of C$33.05 can be a deciding factor for budget-conscious consumers. While both coolers cater to different needs, the cost-effectiveness of the Peerless Assassin might appeal to those looking for a solid cooling solution without breaking the bank.
Design and Build Quality
The Thermalright Peerless Assassin 140 Black features a twin-tower design with a height of 158mm, suitable for large and medium-sized chassis. In contrast, the Noctua NH-L12S is a low-profile cooler with a total height of only 70mm, making it ideal for compact ITX and HTPC systems. Each cooler's design caters to specific user needs; the Peerless Assassin offers a robust cooling solution for larger builds, while the NH-L12S excels in space-constrained environments.
Cooling Performance
Cooling performance is critical for CPU coolers, and the Thermalright Peerless Assassin boasts dual fans with a maximum speed of 1500 RPM, providing an air volume of 66.17 CFM. This dual-fan setup is designed for improved heat dissipation, making it highly effective for CPUs under heavy loads. On the other hand, the Noctua NH-L12S utilises a highly optimised NF-A12x15 120mm fan, which also supports PWM for automatic speed control. While both coolers aim to provide efficient cooling, the Peerless Assassin's dual fans may offer superior airflow for high-performance CPUs.
Noise Levels
When it comes to noise levels, the Thermalright Peerless Assassin has a noise rating of ≤25.6 dB(A), which is relatively quiet for a cooler of its capacity. The Noctua NH-L12S is designed for ultra-quiet operation, leveraging its Low-Noise Adaptor for additional sound control. Although specific decibel ratings for the NH-L12S are not provided, Noctua's reputation for quiet operation suggests that it may perform exceptionally well in this regard. Users sensitive to noise will want to consider how each cooler's design influences acoustics.
Installation and Compatibility
The installation process for both coolers is straightforward, but they cater to different setups. The Thermalright Peerless Assassin comes with a comprehensive mounting kit compatible with various CPU sockets, including Intel LGA1700 and AMD AM4/AM5. This makes it versatile for a broad range of builds. Similarly, the Noctua NH-L12S includes the SecuFirm2 mounting system, which facilitates easy installation on Intel and AMD platforms. However, the NH-L12S also provides an offset mounting option for optimal efficiency, which could be beneficial for specific CPU installations.
Thermal Paste and Accessories
The Thermalright Peerless Assassin does not specify the inclusion of thermal paste, while the Noctua NH-L12S comes with high-end NT-H1 thermal paste. This inclusion adds value to the Noctua cooler, as users won’t have to purchase thermal paste separately, which can be an additional cost and hassle. For those who prioritize comprehensive packages, the NH-L12S may represent a better value despite its higher price.
Target Audience
The Thermalright Peerless Assassin 140 Black is targeted at users who require powerful cooling performance at an attractive price point. Its larger size and dual fans make it ideal for gamers and professionals using high-performance CPUs. On the other hand, the Noctua NH-L12S is aimed at users with compact builds who need efficient cooling in tight spaces. Its low-profile design and quiet operation make it a strong candidate for HTPCs and office environments.
Which should you buy?
Choosing between the Thermalright Peerless Assassin 140 Black and the Noctua NH-L12S depends largely on your specific needs and build requirements. If you are looking for an economical option with superior cooling performance and compatibility with larger builds, the Peerless Assassin at C$54.90 is a compelling choice. Conversely, if you need a compact cooler that excels in quiet operation and comes with high-quality thermal paste, the Noctua NH-L12S at C$87.95 might be worth the extra investment. Ultimately, consider your case size, cooling demands, and budget to make the best choice for your setup.
versusfinder.com is a participant in the Amazon.ca Associates Program. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.

