ARCTIC P12 Pro PST - Powerful Premium Fan, 120 mm PWM Fan with Y-Cable Splitter, 600-3000 RPM, 0 RPM <5% PWM, Fluid Dynamic Bearing, 4-Pin - Black vs Thermalright Peerless Assassin 120 SE V2 CPU Cooler, Dual Tower, 6 Heat Pipes, Dual 120mm PWM Fans, 1850RPM, for AMD AM4/AM5 and Intel LGA1851/1700

Price and Value Comparison

The ARCTIC P12 Pro PST is significantly more affordable than the Thermalright Peerless Assassin 120 SE V2, priced at $9.49 compared to $38.99 — a difference of $29.50, or about 75% cheaper. While the Thermalright cooler offers a dual-tower heatsink with six heat pipes and two PWM fans, it comes at a premium price point that reflects its complex design and broader compatibility. The ARCTIC fan, by contrast, is a single-purpose component focused solely on airflow performance. For users seeking a budget-friendly upgrade to their case’s cooling system, the ARCTIC P12 Pro PST delivers strong value per dollar spent. However, if you're investing in a full CPU cooling solution, the higher cost of the Thermalright model is justified by its integrated cooling hardware.

Cooling Performance and Design

The Thermalright Peerless Assassin 120 SE V2 is engineered for high-performance CPU cooling with a dual tower heatsink and six heat pipes, designed to handle intense workloads like gaming and multitasking. Its dual 120mm PWM fans operate up to 1850 RPM, generating 88.89 CFM of airflow and 2.21 mm H₂O of static pressure, which indicates strong thermal dissipation capability. In contrast, the ARCTIC P12 Pro PST is a standalone fan without a heatsink, relying on its fluid dynamic bearing and optimized blade design to deliver high static pressure even through dense obstructions. While it lacks the integrated cooling structure of the Thermalright, its ability to maintain airflow under resistance makes it ideal for use in radiators or tight-case environments where pressure matters more than raw volume.

Fan Technology and Noise Efficiency

Both coolers utilize advanced fan technology, but they serve different roles. The ARCTIC P12 Pro PST features a Fluid Dynamic Bearing (FDB) and a redesigned rotor blade profile that reduces noise while maintaining efficiency, especially at low speeds. It can stop completely when PWM signal drops below 5%, ensuring silent operation during light loads. The Thermalright Peerless Assassin 120 SE V2 uses S-FDB bearings in its dual 120mm fans, rated at 29.5 dBA noise level at maximum speed. This suggests a balance between performance and acoustic output, though it operates at a fixed 1850 RPM max, limiting fine-tuned control compared to the ARCTIC’s wide 600–3000 RPM range. The ARCTIC fan’s ability to ramp down to near-zero RPM gives it an edge in quietness during idle or low-load scenarios.

Compatibility and Installation

The Thermalright Peerless Assassin 120 SE V2 supports both AMD AM4/AM5 and Intel LGA1851/LGA1700 sockets, making it compatible with current mainstream desktop platforms. Its dimensions are 125 mm (L) x 110 mm (W) x 155 mm (H) without fans, indicating it requires sufficient case clearance. The ARCTIC P12 Pro PST, being a standalone fan, has no socket-specific compatibility issues — it simply plugs into any 4-pin PWM header on a motherboard. Its Y-cable splitter allows one fan to be controlled via a single PWM signal, simplifying wiring. This flexibility makes the ARCTIC fan easier to integrate into existing builds, especially for users upgrading case ventilation rather than replacing a CPU cooler.

Build Quality and Longevity

Both products emphasize durability through precision engineering. The ARCTIC P12 Pro PST features minimal gaps, automatic balancing, and high-precision manufacturing to reduce vibrations and ensure long-term reliability. Its FDB minimizes wear over time, contributing to a longer service life. The Thermalright Peerless Assassin 120 SE V2 uses a copper base with nickel plating and six heat pipes, materials known for excellent thermal conductivity and longevity. The S-FDB bearings in its fans also support sustained performance under load. While both are built for endurance, the ARCTIC fan’s focus on vibration reduction and smooth running aligns with quieter, maintenance-free operation, whereas the Thermalright’s construction prioritizes heat transfer efficiency across extended use.

Use Case Suitability

The Thermalright Peerless Assassin 120 SE V2 is best suited as a complete CPU cooling solution for high-end systems requiring robust thermal management. Its dual-tower design and dual-fan setup make it ideal for overclocking or sustained heavy workloads. The ARCTIC P12 Pro PST, however, functions as a supplemental or primary case fan, not a CPU cooler. It excels in improving airflow through radiators, mesh panels, or narrow chassis spaces due to its high static pressure. Users needing better case ventilation without replacing their CPU cooler will find the ARCTIC fan highly effective. It’s not intended to replace a full cooler but to enhance overall system thermals.

Which should you buy?

Choose the ARCTIC P12 Pro PST if you need a high-performance, quiet, and affordable case fan with exceptional static pressure and PWM control — especially for radiator setups or tight enclosures. At just $9.49, it’s about 75% cheaper than the Thermalright Peerless Assassin 120 SE V2 and offers precise speed control down to 0 RPM. Opt for the Thermalright Peerless Assassin 120 SE V2 only if you’re building or upgrading a high-performance desktop and require a full dual-tower CPU cooler with broad socket support and proven thermal handling for demanding tasks. The $38.99 price reflects its comprehensive cooling system, but it’s not a fan replacement. The choice hinges on whether you need a CPU cooler or just a superior fan.