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ARCTIC P12 Pro PST - Powerful Premium Fan, vs Thermalrlght Peerless Assassin 120 SE CPU Air

Updated July 2026 — ARCTIC P12 Pro PST - Powerful Premium Fan, wins on fan rpm, Thermalrlght Peerless Assassin 120 SE CPU Air wins on height and noise level.

The ARCTIC P12 Pro PST is an excellent choice for budget-conscious users seeking a powerful fan, while the Thermalrlght Peerless Assassin 120 SE offers advanced CPU cooling capabilities. Choose based on your specific cooling needs.

Why ARCTIC P12 Pro PST - Powerful Premium Fan, is better

Price

ARCTIC fan is significantly cheaper at $9.49.

Speed

ARCTIC fan can reach up to 3000 RPM.

Noise

ARCTIC fan operates quieter at lower PWM settings.

Why Thermalrlght Peerless Assassin 120 SE CPU Air is better

Cooling

Thermalrlght cooler has advanced dual-fan system.

Compatibility

Thermalrlght supports a wider range of CPU sockets.

Airflow

Thermalrlght delivers a rated airflow of 66.17 CFM.

Overall score

ARCTIC P12 Pro PST - Powerful Premium Fan,
75
Thermalrlght Peerless Assassin 120 SE CPU Air
85

Specifications

SpecARCTIC P12 Pro PST - Powerful Premium Fan,Thermalrlght Peerless Assassin 120 SE CPU Air
Price$9.49$32.90
AirflowN/A66.17 CFM
Fan TypePWM FanDual PWM Fans
BearingFluid DynamicCopper Heat Pipes
CompatibilityStandard 120mmIntel/AMD

Dimension comparison

ARCTIC P12 Pro PST - Powerful Premium Fan,Thermalrlght Peerless Assassin 120 SE CPU Air

Overview of the Products

The ARCTIC P12 Pro PST is a premium 120 mm PWM fan aimed at providing powerful cooling, while the Thermalrlght Peerless Assassin 120 SE CPU Air Cooler is designed specifically for CPU cooling with an advanced dual-fan system. Both products cater to different cooling needs, with the ARCTIC fan priced at $9.49 and the Thermalrlght cooler at $32.90. This price difference of about 247% highlights their distinct functionalities and target markets.

Design and Build Quality

The ARCTIC P12 Pro PST features a sleek black design, optimized for high static pressure, which allows it to effectively cool through dense radiators and mesh structures. Its fluid dynamic bearing design minimizes noise, making it ideal for quiet environments. In contrast, the Thermalrlght Peerless Assassin 120 SE boasts a more complex design with six heat pipes and dual 120 mm TL-C12C PWM fans. The aluminum heatsink cover and the anodized brushed black top provide not only aesthetic appeal but also efficient thermal performance. The contrasting designs cater to users' preferences for either a standalone fan or a comprehensive CPU cooling solution.

Cooling Performance

In terms of cooling performance, the ARCTIC P12 Pro PST can reach speeds of up to 3000 RPM, ensuring it can handle high airflow demands. Its ability to operate at less than 5% PWM means it can completely stop when not needed, enhancing energy efficiency. On the other hand, the Thermalrlght Peerless Assassin 120 SE, while having a lower fan speed of 1550 RPM, uses six heat pipes and an offset asymmetric layout for increased airflow and heat dissipation. This combination can deliver a rated airflow of 66.17 CFM and a noise level of up to 25.6 dB(A), making it suitable for those who prioritize quiet operation alongside effective cooling.

Compatibility

The ARCTIC P12 Pro PST is highly versatile, easily fitting into various setups due to its standard 120 mm size. It is suitable for dense radiators and can be used in both air and liquid cooling systems. The Thermalrlght Peerless Assassin 120 SE is compatible with a wide range of Intel and AMD sockets, including LGA 1700 and AM4/AM5. This makes it particularly appealing for users looking to upgrade their CPU cooling solution without changing their motherboard. Both products ensure broad compatibility, but the Peerless Assassin offers a more specialized application for CPU cooling.

Noise Levels

Noise levels are a significant consideration in cooling solutions. The ARCTIC P12 Pro PST is designed for minimal noise with its fluid dynamic bearing, providing a quieter operation even at higher RPMs. Conversely, the Thermalrlght Peerless Assassin 120 SE operates at a maximum noise level of 25.6 dB(A), which is relatively low for a dual-fan system. Users who are particularly sensitive to noise may prefer the ARCTIC fan for its quieter performance, especially when operating under lower PWM settings.

Price Consideration

At a price point of $9.49, the ARCTIC P12 Pro PST is significantly cheaper than the Thermalrlght Peerless Assassin 120 SE, which costs $32.90. This represents a substantial price difference of about 247%. For budget-conscious consumers or those looking for a simple fan replacement, the ARCTIC option is a clear winner. However, users investing in a more robust CPU cooling solution may find the higher price of the Thermalrlght cooler justifiable given its advanced features and performance capabilities.

Target Audience

The target audience for the ARCTIC P12 Pro PST includes gamers, PC builders, and anyone looking for efficient cooling solutions at an affordable price. Its features are designed to provide high performance in various setups. The Thermalrlght Peerless Assassin 120 SE, however, is targeted more towards enthusiasts and professionals who need high-performance CPU cooling. Its advanced design and compatibility with a variety of CPU sockets make it an excellent choice for those needing reliable and efficient cooling for demanding applications.

Which should you buy?

Ultimately, the choice between the ARCTIC P12 Pro PST and the Thermalrlght Peerless Assassin 120 SE hinges on your specific cooling needs and budget. If you are looking for a cost-effective fan that provides high airflow and operates quietly, the ARCTIC fan is a solid choice at just $9.49. However, if you need a dedicated CPU cooler with advanced technology for optimal performance, the Thermalrlght cooler is worth the investment at $32.90. Both products excel in their respective categories, making them suitable for different users based on their priorities in cooling performance, noise levels, and budget.