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Thermalright AXP90 X36 Low Profile ITX CPU Cooler, vs Thermalright Peerless Assassin 120 SE V3 CPU Air

Updated August 2026 — Thermalright AXP90 X36 Low Profile ITX CPU Cooler, wins on size compatibili and noise level, Thermalright Peerless Assassin 120 SE V3 CPU Air wins on cooling efficien and build quality.

The Thermalright AXP90 X36 is ideal for compact builds, while the Peerless Assassin 120 SE V3 excels in cooling performance for larger setups.

Why Thermalright AXP90 X36 Low Profile ITX CPU Cooler, is better

Price

AXP90 X36 is significantly cheaper at $20.39

Size

AXP90 X36 is more compact at 36mm height

Noise Level

AXP90 X36 operates quieter at 22.4 DBA

Why Thermalright Peerless Assassin 120 SE V3 CPU Air is better

Cooling Performance

Peerless Assassin 120 SE V3 has dual fans for better cooling

Airflow

Peerless Assassin 120 SE V3 provides 70.84 CFM airflow

Heat Pipes

Peerless Assassin 120 SE V3 features 6 heat pipes for improved heat dissipation

Overall score

Thermalright AXP90 X36 Low Profile ITX CPU Cooler,
75
Thermalright Peerless Assassin 120 SE V3 CPU Air
85

Specifications

SpecThermalright AXP90 X36 Low Profile ITX CPU Cooler,Thermalright Peerless Assassin 120 SE V3 CPU Air
Price$20.39$35.90
Noise Level22.4 DBA29.8 DBA
Fan SpeedMax 1500 RPMUp to 2000 RPM
Air Volume50 CFM70.84 CFM
CompatibilityIntel LGA 115X/1200, AMD AM4/AM5Intel LGA 1851/1700/1150/1151/1200, AMD AM4/AM5

Dimension comparison

Thermalright AXP90 X36 Low Profile ITX CPU Cooler,Thermalright Peerless Assassin 120 SE V3 CPU Air

Overview of the Thermalright AXP90 X36 and Peerless Assassin 120 SE V3

When considering CPU coolers, the Thermalright AXP90 X36 and the Thermalright Peerless Assassin 120 SE V3 present two distinct options catering to different needs. The AXP90 X36 is designed for compact builds, offering a low-profile solution for ITX cases. In contrast, the Peerless Assassin 120 SE V3 is aimed at users seeking superior cooling performance, making it suitable for more expansive setups.

The AXP90 X36 is priced at $20.39, while the Peerless Assassin 120 SE V3 is $35.90. This positions the Peerless Assassin at about 76% higher in price, reflecting its advanced cooling capabilities and dual-fan design.

Design and Build Quality

The design and build quality of the AXP90 X36 emphasizes compactness and efficiency. With a total height of only 36mm, it fits snugly in smaller cases without sacrificing performance. The all-metal platform and nickel plating enhance durability, providing corrosion resistance and low thermal resistance.

In contrast, the Peerless Assassin 120 SE V3 features a robust double-tower design with dual fans, measuring 125x135x155mm. This larger footprint allows for improved airflow and heat dissipation. The use of six heat pipes and an aluminium heatsink cover highlights its capability for high-performance cooling, catering to more demanding setups.

Cooling Performance

Cooling performance is a crucial aspect of any CPU cooler, and both the AXP90 X36 and Peerless Assassin 120 SE V3 excel in their own right. The AXP90 X36 employs four 6mm AGHP heat pipes and operates at a noise level of only 22.4 DBA. This makes it a quiet yet effective solution for low-profile builds, particularly in noise-sensitive environments.

On the other hand, the Peerless Assassin 120 SE V3 offers a more aggressive cooling approach with its dual PWM fans capable of reaching up to 2000 RPM. With an air volume of 70.84 CFM and an operating noise level of 29.8 DBA, it can handle higher thermal loads, making it ideal for overclocking and intensive tasks.

Compatibility

Compatibility is another critical factor when choosing a CPU cooler. The AXP90 X36 supports a wide range of sockets, including Intel LGA 115X/1200 and AMD AM4/AM5. This versatility makes it suitable for various builds, especially in compact systems where space is limited.

Conversely, the Peerless Assassin 120 SE V3 also boasts broad compatibility, supporting Intel LGA 1851/1700/1150/1151/1200 and AMD AM4/AM5. This ensures that it can accommodate a wide variety of modern processors, making it a great choice for those building high-performance systems.

Noise Levels

Noise levels can significantly impact the user experience, especially in quieter environments. The AXP90 X36 operates at a maximum noise level of 22.4 DBA, making it one of the quieter options on the market. This is particularly advantageous for users looking to minimize noise in home theaters or office setups.

In comparison, the Peerless Assassin 120 SE V3, while still relatively quiet, operates at a higher noise level of 29.8 DBA at full speed. This is due to its dual fans working harder to provide optimal cooling. Users prioritizing maximum performance over minimal noise may find this acceptable, but it is a consideration for those seeking a silent operation.

Installation Process

The installation process can vary between CPU coolers, and both the AXP90 X36 and Peerless Assassin 120 SE V3 are designed to be user-friendly. The AXP90 X36 includes a back plate fastener, which simplifies the installation in tight ITX cases. Its compact design may also ease the installation process in cases where space is at a premium.

The Peerless Assassin 120 SE V3 comes with mounting accessories that facilitate installation on both Intel and AMD platforms. However, it is noted that installing it on AMD systems requires using the motherboard's original backplate. This could potentially add complexity for some users, but the thorough instructions provided help to mitigate any concerns.

Price Comparison

Price is a significant factor in any purchasing decision. The Thermalright AXP90 X36 is priced at $20.39, making it an economical choice for budget-conscious consumers or those with compact builds. In contrast, the Peerless Assassin 120 SE V3 is priced at $35.90, which is about 76% more expensive. This price difference reflects the advanced cooling technology and design features that the Peerless Assassin offers.

When considering the overall value, the AXP90 X36 is an excellent choice for those who prioritize cost-effectiveness and space savings. However, the Peerless Assassin provides superior cooling capabilities, which may justify the higher price for users with demanding performance needs.

Which should you buy?

Choosing between the Thermalright AXP90 X36 and the Peerless Assassin 120 SE V3 ultimately depends on your specific needs and build requirements. If you're looking for a compact, efficient, and quieter option for small form factor builds, the AXP90 X36 is the clear choice at $20.39. On the other hand, if you require exceptional cooling performance for high-end CPUs and are willing to invest $35.90, the Peerless Assassin 120 SE V3 is a powerful solution with excellent heat dissipation capabilities. Assess your priorities, and choose accordingly!