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Noctua NH-U9S vs Thermalright Peerless Assassin 120 Mini Black CPU

Updated August 2026 — Noctua NH-U9S wins on warranty and cooling perf, Thermalright Peerless Assassin 120 Mini Black CPU wins on compatibility.

The Noctua NH-U9S offers superior build quality and quieter operation, while the Thermalright Peerless Assassin 120 Mini is a budget-friendly option with solid performance.

Why Noctua NH-U9S is better

Build Quality

Noctua's 6-year warranty indicates superior durability.

Noise Levels

Noctua operates quieter than Thermalright.

Fan Optimization

Noctua's fan is optimized for low noise and high performance.

Why Thermalright Peerless Assassin 120 Mini Black CPU is better

Price

Thermalright is approximately 50% cheaper.

Cooling Technology

Thermalright features advanced AGHP technology.

Airflow

Thermalright's fan provides higher airflow.

Overall score

Noctua NH-U9S
85
Thermalright Peerless Assassin 120 Mini Black CPU
70

Specifications

SpecNoctua NH-U9SThermalright Peerless Assassin 120 Mini Black CPU
Fan SpeedPWM1500 RPM
Noise LevelUltra-quiet25.6 dB(A)
Warranty6 years1 year
CompatibilityLGA1700, AM5LGA1700, AM5
Cooling TypeAirAir

Dimension comparison

Noctua NH-U9SThermalright Peerless Assassin 120 Mini Black CPU

Overview

In this comparison, we will look at two CPU coolers: the Noctua NH-U9S and the Thermalright Peerless Assassin 120 Mini. The Noctua NH-U9S is priced at $69.95, while the Thermalright Peerless Assassin 120 Mini is significantly cheaper at $34.39, making it about 50% less expensive. Both coolers are designed for compact builds but cater to slightly different needs.

Design and Build Quality

The Noctua NH-U9S boasts a compact single-tower design that stands only 125mm tall, making it ideal for small form factor builds. It is specifically designed to avoid overhanging RAM or PCIe slots on most motherboards. In contrast, the Thermalright Peerless Assassin 120 Mini also maintains a small footprint at 125mm x 110mm x 135mm, featuring a fully blackened body with an antioxidant coating. Both coolers emphasize compatibility with various CPU sockets, but Noctua's reputation for quality and durability is backed by a 6-year manufacturer’s warranty.

Cooling Performance

When it comes to cooling performance, the Noctua NH-U9S is equipped with a highly optimized NF-A9 92mm fan, which offers PWM support for automatic speed control and ultra-quiet operation. This cooler is particularly suited for users who prioritize noise levels alongside performance. On the other hand, the Thermalright Peerless Assassin 120 Mini features AGHP technology and six 6mm heat pipes to enhance heat dissipation. Its 120mm PWM fan operates at a speed of 1500 RPM, generating an airflow of 66.87 CFM with a noise level of only 25.6 dB(A). Both coolers promise effective thermal management, but the choice may depend on your preference for fan size and noise levels.

Installation Process

The installation process for both coolers is streamlined, but they employ different mounting systems. The Noctua NH-U9S includes the SecuFirm2 mounting system, which allows for easy installation on various Intel and AMD sockets. This attention to user experience is a hallmark of Noctua's products. The Thermalright Peerless Assassin 120 Mini also provides a user-friendly installation experience with an appropriate mounting kit for different CPU platforms. However, specifics regarding the ease of installation are not highlighted, making Noctua's offering stand out in this category.

Noise Levels

Noise levels are a critical consideration for many users. The Noctua NH-U9S is renowned for its ultra-quiet operation, benefiting from its optimized fan and low-noise adaptor. This cooler is a great option for users who require a quiet computing environment, such as those working in audio production or other sensitive applications. Conversely, the Thermalright Peerless Assassin 120 Mini operates at a maximum noise level of 25.6 dB(A), which is still quite reasonable but may not match the ultra-quiet performance of the Noctua.

Compatibility

Compatibility is an essential factor for CPU coolers. The Noctua NH-U9S supports a wide range of Intel and AMD sockets, including the latest LGA1700 and AM5 platforms. This versatility makes it a solid choice for various builds. The Thermalright Peerless Assassin 120 Mini also supports a variety of Intel and AMD sockets, ensuring it can be used in numerous setups. While both coolers offer broad compatibility, Noctua's established reputation for quality and support may provide additional peace of mind for users.

Price Difference

There is a significant price difference between the two coolers, with the Noctua NH-U9S retailing at $69.95 and the Thermalright Peerless Assassin 120 Mini at $34.39. This difference of about $35.56 makes the Thermalright cooler approximately 50% less expensive. For budget-conscious consumers, the Thermalright model presents an attractive option without sacrificing essential features, though it may lack some premium elements found in the Noctua cooler.

Which should you buy?

Ultimately, the choice between the Noctua NH-U9S and the Thermalright Peerless Assassin 120 Mini boils down to your specific needs and budget. The Noctua NH-U9S offers superior build quality, quieter operation, and a longer warranty, making it an excellent investment for those prioritizing performance and durability. However, if you're looking for a more budget-friendly option that still provides solid cooling performance, the Thermalright Peerless Assassin 120 Mini is a commendable choice. If price is your main concern, the Thermalright cooler at $34.39 represents a significantly lower investment while still delivering essential cooling capabilities.