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be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 vs Thermalright Peerless Assassin 120 SE V3 CPU Air

Updated August 2026 — be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 leads on build quality and design.

The be quiet! Pure Rock Pro 3 offers superior performance and design, while the Thermalright Peerless Assassin 120 SE V3 is a budget-friendly alternative. Choose based on your performance needs and budget.

Why be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6 is better

Cooling Performance

Superior heat dissipation with advanced design

Design

Sleek and compact aesthetic

Installation

User-friendly mounting kit

Why Thermalright Peerless Assassin 120 SE V3 CPU Air is better

Price

More affordable option

Airflow

Dual fans provide substantial airflow

Noise Levels

Operational noise is specified and low

Overall score

be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6
85
Thermalright Peerless Assassin 120 SE V3 CPU Air
75

Specifications

Specbe quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6Thermalright Peerless Assassin 120 SE V3 CPU Air
Heat Pipes6mm6mm
Fan Speed1500 RPM2000 RPM
Air Volume62 CFM70.84 CFM
Noise Level≤25 dB(A)≤29.8 dB(A)
CompatibilityAM4/AM5, LGA 1700AM4/AM5, LGA 1851

Dimension comparison

be quiet! Pure Rock Pro 3 Black CPU Air Cooler | 6Thermalright Peerless Assassin 120 SE V3 CPU Air

Overview of the Coolers

The be quiet! Pure Rock Pro 3 Black CPU Air Cooler and the Thermalright Peerless Assassin 120 SE V3 CPU Air Cooler offer competitive features for users seeking efficient cooling solutions. Priced at $54.90, the Pure Rock Pro 3 is positioned as a high-performance option for demanding systems. In contrast, the Peerless Assassin 120 SE V3 is more budget-friendly at $35.90, making it about 35% cheaper. Both coolers feature advanced heat pipe technologies aimed at enhancing thermal management in various CPU setups.

Cooling Performance

When it comes to cooling performance, the be quiet! Pure Rock Pro 3 is equipped with six high-performance 6mm heat pipes and a 120mm PWM fan designed for optimal airflow. The cooler's innovative design ensures that it can maintain CPU temperatures even during overclocked scenarios. On the other hand, the Thermalright Peerless Assassin 120 SE V3 also utilizes six heat pipes along with dual 120mm PWM fans that can reach speeds of up to 2000 RPM. This dual-fan configuration allows it to deliver substantial airflow, with an air volume rating of 70.84 CFM. Both coolers excel in heat dissipation, but the dual-fan setup of the Peerless Assassin may offer a slight edge in airflow efficiency.

Design and Aesthetics

The aesthetic appeal of a CPU cooler can influence a user's choice, and both the be quiet! Pure Rock Pro 3 and the Thermalright Peerless Assassin 120 SE V3 have distinctive designs. The Pure Rock Pro 3 features a sleek, black finish with a compact offset design that enhances RAM and VRM compatibility. Its elegant lines combine power with a discreet look, making it suitable for various builds. Conversely, the Peerless Assassin 120 SE V3 boasts a striking double-tower design with an aluminium heatsink cover, giving it a more robust appearance. While both coolers are visually appealing, the choice largely depends on personal preference regarding aesthetics.

Installation Process

Ease of installation is critical for many users, and both coolers have features that simplify this process. The be quiet! Pure Rock Pro 3 is noted for its user-friendly mounting kit, which makes attachment straightforward. Additionally, it caters to users with AM5 CPUs by allowing an offset mounting to optimize the cooler's position over the CPU's hot spots. Meanwhile, the Thermalright Peerless Assassin 120 SE V3 also emphasizes ease of installation, providing detailed instructions and requiring the use of the motherboard's original backplate for AMD platforms. Both coolers are designed to facilitate a hassle-free setup, ensuring that users can get their systems running quickly.

Noise Levels

Noise output is an essential factor for users concerned about maintaining a quiet computing environment. The be quiet! Pure Rock Pro 3 is designed with a focus on silent operation, featuring a PWM fan that allows for optimized performance without generating excessive noise. Although specific noise levels are not stated for the Pure Rock Pro 3, its branding suggests a commitment to quiet performance. In contrast, the Thermalright Peerless Assassin 120 SE V3 has an operational noise level of ≤29.8 dB(A), which is relatively quiet for a cooler of its type. Users looking for a cooler that minimizes sound while providing effective cooling should consider these aspects carefully.

Compatibility

Both coolers offer wide compatibility with various CPU sockets, catering to a range of setups. The be quiet! Pure Rock Pro 3 is compatible with AMD AM4 and AM5 sockets as well as Intel LGA 1700, 1150, 1151, and 1200. This extensive compatibility ensures that it can be used across multiple platforms. Similarly, the Thermalright Peerless Assassin 120 SE V3 supports both Intel and AMD sockets, including LGA 1851, 1700, 1150, 1151, and AM4/AM5. This versatility makes both coolers suitable for users looking to upgrade or build new systems without worrying about compatibility issues.

Price Considerations

Pricing is a significant factor when deciding between the two coolers. The be quiet! Pure Rock Pro 3 is priced at $54.90, while the Thermalright Peerless Assassin 120 SE V3 is available for $35.90. This price difference of $19 means that the Peerless Assassin is about 35% less expensive than the Pure Rock Pro 3. For budget-conscious users or those who do not require the highest-end performance, the Peerless Assassin presents a compelling option without sacrificing essential cooling capabilities.

Which should you buy?

Ultimately, the choice between the be quiet! Pure Rock Pro 3 and the Thermalright Peerless Assassin 120 SE V3 will depend on your specific needs and budget. If you prioritize high performance in overclocked systems and value a sleek design, the Pure Rock Pro 3 is a solid choice. However, if you are looking for a more economical option that still offers robust cooling capabilities, the Peerless Assassin 120 SE V3 is an excellent alternative. Both coolers excel in their own right, making either a great addition to your PC build.