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 Assassin X120 Refined SE CPU Air Cooler, 4 Heat Pipes, TL-C12C PWM Fan, Aluminium Heatsink Cover, AGHP Technology, for AMD AM4/AM5/Intel LGA 1150/1151/1155/1200/1700/1851(AX120 R SE)

Performance and Cooling Efficiency

The Thermalright Assassin X120 Refined SE delivers significantly higher cooling performance than the ARCTIC P12 Pro PST. While the ARCTIC fan is designed for high static pressure and efficient airflow through dense structures, it lacks a specified CFM (cubic feet per minute) rating. In contrast, the Thermalright’s TL-C12C PWM fan produces up to 66.17 CFM at maximum speed, a measurable benchmark for airflow capacity. This makes the Thermalright cooler better suited for high-heat CPUs, especially under sustained loads. The ARCTIC fan’s 3000 RPM max speed offers strong dynamic range, but without a defined airflow figure, its real-world cooling impact remains less quantifiable. For users prioritizing raw thermal performance over quiet operation, the Thermalright’s documented airflow output gives it a clear edge.

Noise Levels and Operational Quietness

The Thermalright Assassin X120 Refined SE operates more quietly than the ARCTIC P12 Pro PST under load. The Thermalright’s TL-C12C fan has a noise level capped at ≤25.6 dB(A), which is well within the range of near-silent operation. The ARCTIC fan, while featuring a Fluid Dynamic Bearing (FDB) for reduced vibration and noise, does not provide a maximum decibel rating. Instead, it emphasizes smooth running and low noise via precision manufacturing and FDB technology. However, without a specific dB(A) value, direct comparison is limited. Given that the Thermalright explicitly states its noise ceiling, it offers a more transparent and verifiable quietness profile. For users seeking predictable, ultra-quiet performance, the Thermalright’s stated noise level provides greater assurance.

Build Quality and Durability

Both coolers emphasize long-term reliability, but the Thermalright Assassin X120 Refined SE includes more detailed durability claims. It features S-FDB bearings, which are specifically noted for ensuring long service life in air-cooler radiators. Additionally, the cooler uses industrial-grade PBT + PC material with UL class A safety insulation, indicating robust construction standards. The ARCTIC P12 Pro PST also uses a Fluid Dynamic Bearing, which minimizes noise and supports longevity, but no specific lifespan or material certifications are mentioned. The Thermalright’s AGHP technology is said to solve inverse gravity effects from vertical/horizontal orientation, suggesting enhanced stability across mounting positions. These added engineering details give the Thermalright an advantage in perceived build quality and resilience.

Fan Control and Smart Features

The ARCTIC P12 Pro PST offers more granular control over fan speed due to its PWM capability with a wide 600–3000 RPM range. It can stop completely at less than 5% PWM, enabling silent operation during light workloads. The Thermalright’s TL-C12C fan runs at 1550 RPM ±10%, meaning it operates at a fixed mid-range speed with less flexibility. While both use 4-pin PWM connectors, the ARCTIC’s broader RPM range allows for finer tuning across varying system loads. This makes the ARCTIC fan better suited for users who want precise, adaptive cooling based on temperature. The Thermalright’s fan, though efficient, lacks this fine-tuned responsiveness, limiting its adaptability in systems where minimal noise is critical during idle periods.

Price and Value for Money

The ARCTIC P12 Pro PST is about 47% cheaper than the Thermalright Assassin X120 Refined SE. At $9.49, it costs just under half of the $17.90 Thermalright cooler. This price difference reflects their distinct roles: the ARCTIC is a standalone fan, while the Thermalright is a complete CPU air cooler with heat pipes, mounting hardware, and a heatsink. For users needing only a high-performance case fan, the ARCTIC offers exceptional value. However, for those requiring a full cooling solution, the Thermalright’s higher price is justified by its integrated design and superior airflow output. The ARCTIC’s lower cost makes it ideal as a supplemental or replacement fan, while the Thermalright’s premium pricing aligns with its comprehensive cooling package.

Compatibility and Installation

The Thermalright Assassin X120 Refined SE supports a broad range of CPU sockets, including Intel LGA 1150/1151/1155/1200/1700/1851 and AMD AM4/AM5. It comes with mounting plates and fasteners for each platform, ensuring compatibility out of the box. The ARCTIC P12 Pro PST, being a standalone fan, has no socket-specific compatibility—it simply fits into any standard 120mm fan mount. Its lack of installation complexity means it can be used in various configurations, such as intake, exhaust, or radiator fans. However, it doesn’t include mounting hardware beyond the fan itself. Users installing the Thermalright will benefit from pre-configured support for multiple platforms, reducing setup time and potential errors.

Which should you buy?

Choose the ARCTIC P12 Pro PST if you need a high-static-pressure, quiet, and affordable 120mm PWM fan for case ventilation or radiator use—especially at $9.49, it’s about 47% cheaper than the Thermalright. Opt for the Thermalright Assassin X120 Refined SE if you’re building a new system and require a full CPU air cooler with proven airflow (66.17 CFM), low noise (≤25.6 dB(A)), and support for modern AMD and Intel sockets—all for $17.90. The Thermalright offers superior cooling performance and built-in compatibility, making it the better choice for a complete cooling solution, while the ARCTIC excels as a cost-effective, high-performance fan upgrade.