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

Updated August 2026 — Noctua NH-L12S wins on warranty and cooling performa, Thermalright Peerless Assassin 120 SE CPU Cooler, wins on compatibility.

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

Why Noctua NH-L12S is better

Quiet Operation

Designed for silent computing

Compact Size

Fits in tight spaces

Build Quality

Renowned craftsmanship with a 6-year warranty

Why Thermalright Peerless Assassin 120 SE CPU Cooler, is better

Cooling Performance

Dual fans provide superior airflow

Price

More affordable option

Heat Pipes

Advanced AGHP technology for better heat transfer

Overall score

Noctua NH-L12S
85
Thermalright Peerless Assassin 120 SE CPU Cooler,
75

Specifications

SpecNoctua NH-L12SThermalright Peerless Assassin 120 SE CPU Cooler,
Price$74.95$49.99
Fan TypePWMPWM
Socket SupportIntel LGA1700, AM4/AM5Intel LGA1700, AM4/AM5
Noise Level≤25 dB(A)≤25.6 dB(A)
Warranty6 years3 years

Dimension comparison

Noctua NH-L12SThermalright Peerless Assassin 120 SE CPU Cooler,

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

The Noctua NH-L12S is priced at $74.95, while the Thermalright Peerless Assassin 120 SE is about 33% cheaper at $49.99. Both coolers cater to different user needs and preferences, with Noctua focusing on low-profile design and silent operation, while Thermalright emphasizes high performance with dual fans and advanced cooling technology.

Noctua’s NH-L12S is a compact, premium-quality CPU cooler aimed primarily at small form factor builds, such as ITX and HTPC systems. With a total height of just 70mm, it’s designed to fit snugly in tight spaces without sacrificing cooling efficiency. In contrast, the Thermalright Peerless Assassin 120 SE stands taller at 155mm and features a dual-fan setup, which allows for greater airflow and cooling capacity, making it suitable for users seeking superior thermal performance.

Design and Build Quality

When it comes to design and build quality, both coolers reflect their brands' reputations. The Noctua NH-L12S showcases a sleek, brown finish that is characteristic of Noctua products, while its compact form factor enhances compatibility with various builds. It includes a high-end NT-H1 thermal paste and an easy-to-install SecuFirm2 mounting system, ensuring a hassle-free installation process.

The Thermalright Peerless Assassin 120 SE, on the other hand, boasts a more robust design with a double tower configuration and six heat pipes, which is instrumental in increasing its cooling performance. The use of AGHP technology in the heat pipes helps to combat the inverse gravity effect, ensuring efficient heat transfer regardless of the cooler’s orientation. Both coolers are built with high-quality materials, but the NH-L12S is renowned for its exceptional craftsmanship and durability, backed by a 6-year manufacturer’s warranty.

Cooling Performance

Cooling performance is where the Thermalright Peerless Assassin 120 SE distinguishes itself. With its dual 120mm PWM fans capable of reaching speeds of 1550 RPM, it offers a maximum airflow of 66.17 CFM while maintaining a noise level of ≤25.6 dB(A). This level of performance is particularly advantageous for users with high-end CPUs that generate significant heat.

In contrast, the Noctua NH-L12S is designed for quieter operation rather than brute cooling power. Its optimized NF-A12x15 120mm fan delivers efficient cooling at lower speeds, making it an excellent choice for users who prioritize silent operation over maximum cooling. The NH-L12S is particularly effective in compact cases, where airflow can be restricted. Users who need high-performance cooling might find the Thermalright option more suitable, while those looking for a quieter, low-profile solution may prefer the Noctua.

Installation and Compatibility

Both coolers are designed with ease of installation in mind, but they cater to different user requirements. The Noctua NH-L12S features a SecuFirm2 mounting system that supports a wide range of Intel and AMD sockets, including the latest LGA1700 and AM5. This versatility makes it a great option for users building compact systems with various CPU platforms.

The Thermalright Peerless Assassin 120 SE also supports a variety of sockets, including Intel LGA 1700 and AMD AM4/AM5. However, its larger size means users must ensure compatibility with their case and motherboard dimensions. The installation process is straightforward, but it requires checking the case dimensions to confirm that the cooler will fit, which could deter some users, especially those new to PC building.

Noise Levels

Noise levels are crucial for users who want a quiet computing experience. The Noctua NH-L12S excels in this regard, as it is designed to operate quietly, even under load. Thanks to its low-noise adaptor, users can enjoy a near-silent operation, making it ideal for media centers or office environments.

In contrast, while the Thermalright Peerless Assassin 120 SE is efficient in cooling, it does produce more noise, especially at higher fan speeds. With a maximum noise level of 25.6 dB(A), it is louder than the Noctua. Users who prioritize a quiet system might find the NH-L12S more appealing, while those willing to accept some noise for better cooling performance may lean towards the Thermalright option.

Price Comparison

The Noctua NH-L12S is priced at $74.95, while the Thermalright Peerless Assassin 120 SE is priced at $49.99, making it about 33% less expensive. This significant price difference could be a decisive factor for budget-conscious builders. While Noctua products are often seen as premium offerings, Thermalright provides excellent value for those seeking good performance without breaking the bank.

The difference in price also reflects the distinct target audiences of these coolers. The NH-L12S is aimed at enthusiasts who need a reliable, quiet, low-profile solution, while the Peerless Assassin 120 SE attracts gamers and performance enthusiasts looking for effective cooling at a more accessible price.

Which should you buy?

Choosing between the Noctua NH-L12S and the Thermalright Peerless Assassin 120 SE ultimately depends on your specific needs and preferences. If you prioritize compact size, silent operation, and build quality, the Noctua NH-L12S is the superior choice, albeit at a higher price of $74.95. Conversely, if you require robust cooling performance at a more affordable price, the Thermalright Peerless Assassin 120 SE at $49.99 provides excellent value with its dual-fan setup and advanced cooling technology.