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 Black CPU Air Cooler, 6 Heat Pipes,TL-C12B PWM Fan, Aluminium Heatsink Cover, AGHP Technology, for AMD AM4/AM5/Intel LGA 1700/115X/1851/1200/2066/2011 PA120 Black

Price Comparison

The ARCTIC P12 Pro PST is significantly more affordable than the Thermalright Peerless Assassin 120 Black, priced at $9.49 compared to $38.90—about 75% cheaper. This price difference reflects a fundamental distinction in function: the P12 Pro is a single 120 mm PWM fan, while the Peerless Assassin 120 Black is a full CPU air cooler with dual fans, six heat pipes, and complex mounting hardware. The P12 Pro’s low cost makes it ideal for users seeking a quiet, efficient fan upgrade without investing in a complete cooling solution. In contrast, the Peerless Assassin 120 Black’s higher price aligns with its role as a high-performance cooling system designed for demanding CPUs.

Cooling Performance

The Thermalright Peerless Assassin 120 Black delivers superior cooling performance due to its dual TL-C12B PWM fans and six copper heat pipes using AGHP technology. It supports up to 245W TDP, making it suitable for high-end processors under sustained load. Its dual-fan design generates 66.17 CFM of airflow at maximum speed, enhancing thermal dissipation across a large aluminum heatsink. The ARCTIC P12 Pro PST, while effective, is limited to a single fan with no mention of heat pipe integration or TDP rating. It relies on high static pressure and fluid dynamic bearing efficiency but lacks the multi-fan architecture that enables the Peerless Assassin 120 Black to manage intense heat output from powerful CPUs.

Fan Technology and Noise Levels

Both coolers feature PWM-controlled fans with 4-pin connectors, allowing for variable speed control. The ARCTIC P12 Pro PST can operate between 600–3000 RPM and stops completely at less than 5% PWM, ensuring silent operation during low-load scenarios. Its fluid dynamic bearing (FDB) minimizes noise and vibration, contributing to long-term reliability. The Thermalright Peerless Assassin 120 Black uses two TL-C12B fans rated at 1500 RPM ±10%, producing a maximum noise level of ≤25.6 dB(A). While both are designed for quiet operation, the Peerless Assassin 120 Black’s dual-fan setup provides better airflow management, though it operates at a higher baseline RPM than the P12 Pro’s lower-speed range.

Build Quality and Design

The Thermalright Peerless Assassin 120 Black features a double-tower aluminum heatsink with a black nanoscale electroplated finish, offering a sleek, durable build. Its offset asymmetric layout allows installation even when a graphics card occupies the first PCIe slot, improving compatibility with modern motherboards. The unit includes metal fasteners for Intel and AMD platforms and comes with mounting hardware for multiple sockets. The ARCTIC P12 Pro PST has a simpler design focused solely on fan performance: it uses a fluid dynamic bearing and precision-balanced blades to reduce vibration. However, it lacks any heatsink or mounting components, meaning it’s not a standalone cooling solution.

Compatibility and Installation

The Thermalright Peerless Assassin 120 Black supports a wide range of sockets including Intel LGA 1150/1151/1155/1156/1200/1700/17XX/2066/2011 and AMD AM4/AM5, with dedicated mounting plates included for each platform. Its dimensions (125x135x157 mm) require sufficient case clearance, particularly for taller RAM modules. The ARCTIC P12 Pro PST has no socket-specific compatibility—it’s simply a fan meant for general use, such as case intake/exhaust or radiator mounting. It does not include mounting hardware, so it must be installed separately. Users needing a plug-and-play CPU cooler should choose the Peerless Assassin 120 Black; those upgrading case airflow may find the P12 Pro sufficient.

Value Proposition

The ARCTIC P12 Pro PST offers exceptional value as a standalone fan, costing just $9.49—under half the price of a typical mid-tier CPU cooler. It excels in quiet, reliable operation with minimal vibration and a wide PWM speed range. However, it cannot replace a full cooling system. The Thermalright Peerless Assassin 120 Black justifies its $38.90 price with a comprehensive cooling package: dual fans, six heat pipes, AGHP technology, and broad socket support. For users prioritizing cooling capacity and future-proofing, the higher cost is warranted by measurable performance gains. The P12 Pro is a budget-friendly add-on; the Peerless Assassin 120 Black is an investment in sustained thermal performance.

Which should you buy?

Choose the ARCTIC P12 Pro PST if you need a quiet, efficient 120 mm PWM fan for case ventilation or radiator use and want to save over $29. The $9.49 price point makes it one of the most cost-effective premium fans available. Opt for the Thermalright Peerless Assassin 120 Black only if you’re building or upgrading a high-performance desktop with a CPU that demands robust cooling—especially one exceeding 245W TDP. At $38.90, it delivers a complete cooling solution with dual fans, advanced heat pipe technology, and broad socket compatibility. If your goal is to maximize CPU temperature control and longevity, the Peerless Assassin 120 Black is the clear choice. But if you're simply replacing or adding a fan, the ARCTIC P12 Pro PST offers unmatched value.