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 V3 CPU Air Cooler, 6 Heat Pipes, Double Towers Double Fans, TL-P12 PWM Fan, Aluminium Heatsink Cover, for AM4/AM5/Intel LGA1851/1700/1150/1151/1200（PA120SE V3）

Performance and Cooling Design

The Thermalright Peerless Assassin 120 SE V3 delivers significantly higher cooling performance than the ARCTIC P12 Pro PST due to its dual-fan, double-tower design with six heat pipes. While the ARCTIC fan is optimized for airflow and static pressure in tight spaces, the Thermalright cooler uses a full dual-fan system with two TL-P12 PWM fans that operate at up to 2000 RPM, generating an air volume of 70.84 CFM and producing 2.63 MM H2O of air pressure—far exceeding typical single-fan capabilities. The ARCTIC P12 Pro PST, by contrast, operates as a standalone 120 mm PWM fan with a speed range of 600–3000 RPM but lacks the thermal mass and surface area needed for high-TDP CPU cooling. The Thermalright’s symmetrical all-aluminium fins combined with AGHP 5th generation heat pipe technology provide superior heat transfer across both vertical and horizontal orientations.

Fan Technology and Noise Efficiency

The ARCTIC P12 Pro PST features a fluid dynamic bearing (FDB) and a redesigned blade profile for smooth, quiet operation, stopping completely at less than 5% PWM input. This makes it ideal for low-noise environments where minimal fan activity is desired. However, the Thermalright Peerless Assassin 120 SE V3 uses two 120 mm PWM fans rated at up to 2000 RPM with an operating noise level of ≤29.8 dB(A), which is louder than the ARCTIC fan’s silent idle but still within acceptable limits for most gaming or workstation setups. The Thermalright fans are designed to automatically adjust speed based on motherboard temperature signals, eliminating manual tuning. While the ARCTIC fan offers quieter performance at low loads, the Thermalright’s dual-fan setup provides consistent cooling under sustained workloads, even if slightly noisier during peak operation.

Build Quality and Material Construction

The Thermalright Peerless Assassin 120 SE V3 boasts a robust construction with a blackened anodic matte top sheet, nickel-plated anti-oxidation heat pipes, and a Seiko micro-carved reflow soldering nickel-plated copper bottom. These materials enhance durability and heat conductivity, especially under prolonged use. The ARCTIC P12 Pro PST, while using a fluid dynamic bearing and precision-balanced blades, is a single fan without any heatsink integration—its build quality is focused on vibration reduction and long-term reliability rather than thermal capacity. The Thermalright cooler’s all-aluminium fin array and dual-fan configuration offer far greater thermal surface area and structural integrity compared to the ARCTIC fan’s standalone design, making it better suited for high-performance CPUs.

Compatibility and Installation

The Thermalright Peerless Assassin 120 SE V3 supports a wide range of platforms including Intel LGA 1851/1700/1150/1151/1200 and AMD AM4/AM5, with included mounting accessories and compatibility notes for both Intel and AMD motherboards. It requires the original backplate for AMD installations, which adds complexity but ensures secure fitment. The ARCTIC P12 Pro PST has no platform-specific installation requirements—it’s simply a 120 mm PWM fan meant for case or radiator mounting. Its Y-cable splitter allows connection to multiple devices, offering flexibility in system airflow management. However, it does not function as a CPU cooler and cannot replace a full heatsink solution.

Price and Value Comparison

The ARCTIC P12 Pro PST is priced at $9.49, making it about 73% cheaper than the Thermalright Peerless Assassin 120 SE V3, which costs $35.90. This price difference reflects their fundamentally different roles: the ARCTIC fan is a component for improving case or radiator airflow, while the Thermalright cooler is a complete CPU cooling solution. For users seeking a budget-friendly upgrade to case ventilation, the ARCTIC fan offers excellent value. However, those needing effective CPU cooling for high-end processors will find the Thermalright’s higher cost justified by its integrated cooling performance, heat dissipation efficiency, and multi-platform support.

Real-World Use Cases

The ARCTIC P12 Pro PST excels as a supplemental fan in systems with limited space or dense radiators, where high static pressure and quiet operation are critical. Its ability to stop at less than 5% PWM makes it ideal for passive cooling scenarios or low-power builds. In contrast, the Thermalright Peerless Assassin 120 SE V3 is engineered for high-TDP CPUs, particularly in gaming or content creation rigs where sustained thermal performance matters. Its dual-fan setup and large heatsink ensure stable temperatures under load, making it suitable for overclocked processors. Users prioritizing silent operation may prefer the ARCTIC fan, but those needing reliable CPU cooling should opt for the Thermalright.

Which should you buy?

Choose the ARCTIC P12 Pro PST if you need a quiet, high-static-pressure 120 mm PWM fan for case or radiator use—especially at just $9.49, it’s about 73% cheaper than the Thermalright Peerless Assassin 120 SE V3. It’s ideal for improving airflow in tight spaces or reducing noise in low-load scenarios. However, if you’re building or upgrading a high-performance PC with a demanding CPU, the Thermalright Peerless Assassin 120 SE V3 is the only viable choice: its dual-fan, double-tower design with six heat pipes and 2000 RPM fans delivers superior cooling capacity, wide platform compatibility, and robust construction—justifying its $35.90 price tag. For CPU cooling, the Thermalright is essential; for case airflow, the ARCTIC is more than sufficient.