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Noctua NH-L9x65 vs Thermalright Peerless Assassin 120 Vision MAX ARGB

Updated August 2026 — Noctua NH-L9x65 wins on size and installation, Thermalright Peerless Assassin 120 Vision MAX ARGB wins on design and cooling.

The Noctua NH-L9x65 excels in compactness and quiet operation, while the Thermalright Peerless Assassin 120 offers superior cooling performance and features at a lower price.

Why Noctua NH-L9x65 is better

Compact Design

Ideal for small form factor builds.

Silent Operation

Optimized for ultra-quiet performance.

Easy Installation

Simpler mounting system.

Why Thermalright Peerless Assassin 120 Vision MAX ARGB is better

Cooling Performance

Higher fan speed and airflow.

Price

More budget-friendly option.

Aesthetic Features

Includes a built-in LCD display.

Overall score

Noctua NH-L9x65
78
Thermalright Peerless Assassin 120 Vision MAX ARGB
85

Specifications

SpecNoctua NH-L9x65Thermalright Peerless Assassin 120 Vision MAX ARGB
Max RPM15002150
Noise Level≤23 dB(A)≤27 dB(A)
Heat Pipes16
Socket SupportIntel/AMDIntel/AMD
Thermal PasteNT-H1Included

Dimension comparison

Noctua NH-L9x65Thermalright Peerless Assassin 120 Vision MAX ARGB

Overview of the Noctua NH-L9x65 and Thermalright Peerless Assassin 120 Vision MAX

The Noctua NH-L9x65 is a premium low-profile CPU cooler priced at $69.95, while the Thermalright Peerless Assassin 120 Vision MAX is a more robust twin-tower cooler available for $57.69. The price difference of about 17% makes the Thermalright a more budget-friendly option. Both coolers target different user needs, with Noctua focusing on compact builds and Thermalright catering to users seeking enhanced cooling performance.

Design and Build Quality

The Noctua NH-L9x65 features a compact design with a total height of only 65mm, making it ideal for small form factor builds, such as HTPCs and ITX systems. The cooler does not overhang RAM or PCIe slots, providing compatibility with a wide range of motherboards. In contrast, the Thermalright Peerless Assassin stands at 164mm, incorporating a twin-tower design that enhances its cooling capacity. Its matte black coating and a magnetic top cover with a built-in 5-inch IPS LCD display not only enhance aesthetics but also functionality. Each cooler has its strengths, with Noctua excelling in space-saving designs and Thermalright offering advanced visual monitoring.

Cooling Performance

The Thermalright Peerless Assassin outshines the Noctua NH-L9x65 in cooling performance with a maximum fan speed of 2150 RPM, delivering superior airflow of 69 CFM. It features six pure copper heat pipes and a nickel-plated copper base, ensuring optimal contact with the CPU while maintaining a noise level of ≤27 dB(A). On the other hand, the Noctua NH-L9x65 is designed for CPUs with low to moderate heat dissipation, making it suitable for processors like the AMD Ryzen 7950X3D. While it is optimized for quiet operation with a PWM-supported NF-A9x14 slim fan, it may not provide the same level of cooling efficiency under heavy workloads as the Thermalright.

Installation Process

Both coolers come with user-friendly installation systems. The Noctua NH-L9x65 includes the SecuFirm2 mounting system, ensuring easy installation on various Intel and AMD sockets, including LGA1700 and AM4. It also comes pre-applied with high-end NT-H1 thermal paste. The Thermalright Peerless Assassin also supports multiple Intel and AMD socket types and includes an easy-to-follow installation guide. However, the added complexity of dual towers and fans may require a bit more attention during setup compared to the more straightforward Noctua design.

Noise Levels

If noise levels are a concern, the Noctua NH-L9x65 is the quieter option, with its optimized fan and low-noise adaptor ensuring ultra-quiet operation. While the Thermalright Peerless Assassin operates at a noise level of ≤27 dB(A), it may generate more sound due to its higher RPM and dual-fan configuration. For users prioritizing silent operation, particularly in home theater setups, the Noctua cooler stands out, whereas those looking for performance might accept a little extra noise from the Thermalright.

Aesthetics and Features

The aesthetics of the Thermalright Peerless Assassin are significantly enhanced by its 5-inch IPS LCD screen, which provides real-time system monitoring and customizable backgrounds via TRCC control software. This feature is not present in the Noctua NH-L9x65, which opts for a more utilitarian brown and beige color scheme. The visual flair of the Thermalright cooler could be a deciding factor for gamers and PC builders looking for a visually striking component, while the Noctua’s functional design appeals to minimalists and users focused on performance over aesthetics.

Price Comparison

The Noctua NH-L9x65 is priced at $69.95, while the Thermalright Peerless Assassin is available for $57.69, marking a price difference of about $12.26. This makes the Thermalright about 17% cheaper than Noctua. For budget-conscious consumers, the lower price of the Thermalright is appealing, especially considering its advanced features and superior cooling performance. However, the Noctua may justify its higher price through its compact design and silent operation, which could be worth the investment for specific use cases.

Which should you buy?

Choosing between the Noctua NH-L9x65 and the Thermalright Peerless Assassin 120 Vision MAX ultimately depends on your specific needs. If you require a low-profile cooler for a compact build and prioritize silent operation, the Noctua NH-L9x65 is the better choice despite its higher price. Conversely, if you are looking for enhanced cooling performance, aesthetic features, and a lower price point, the Thermalright Peerless Assassin is the clear winner. Each cooler excels in different areas, making your choice contingent on your build requirements and personal preference.