Thermalright Peerless Assassin 120 Mini Black CPU Air Cooler - Compact

In this review of the Peerless Assassin 120 Mini Black, the bottom line is simple: it is a compact, high-performance air cooler best suited to small-form-factor builds and mainstream desktop CPUs that need serious cooling without a tall tower. The reviewer found its combination of a dual-tower layout, six fully plated 6mm heatpipes using AGHP technology, and a 120mm TL-D12B PWM fan delivers strong thermal performance in a surprisingly small 135mm height. For anyone fitting cooling into tighter cases or a tidy build, the Peerless Assassin 120 Mini Black is worth considering.

Key Features

• AGHP 4th generation heatpipes: Six 6mm heatpipes reduce anti-gravity flow effects and maintain consistent heat transfer regardless of cooler orientation.
• Dual tower fin stacks: Two symmetrical mech-type aluminium fin towers expand surface area with 48 fins per tower to improve sustained heat dissipation under load.
• 120mm TL-D12B PWM fan: A performance PWM fan with S-FDB bearing and shock-absorbing silicone feet keeps airflow steady while minimizing jitter and noise.
• All-black finish: Fully blackened aluminium body with antioxidant coating and a CNC micro-engraved copper base offers a durable look and efficient contact with the CPU.
• Compact dimensions: At 125 x 110 x 135 mm it fits many mid- and small-sized cases while still providing multi-heatpipe cooling power.

Who It's For

The Peerless Assassin 120 Mini Black is ideal for PC builders who need strong cooling in constrained spaces - small-form-factor gamers, compact workstation builders, and anyone replacing low-profile coolers in tighter chassis. Its smaller height and dual-tower layout make it a practical upgrade when case clearance prevents larger coolers, and customers noted it handles CPUs like the 5700X3D-style chips well.

It is less appropriate for extreme overclockers or users seeking the absolute lowest temperatures possible from a large tower or custom water loop; those users should look at larger air towers or liquid cooling. Also, builders who require RGB lighting or visual flair should look elsewhere since this model emphasizes a stealthy all-black aesthetic and performance.

Pros & Cons

Pros

• Strong cooling from six heatpipes and dual towers while remaining compact enough for many small cases.
• Quiet operation thanks to the S-FDB bearing, anti-touch fan blades, and silicone vibration mounts.
• Solid build quality with a CNC-engraved copper base and antioxidant black coating for durability and thermal contact.
• Compatible with a wide range of Intel and AMD sockets for easy cross-platform use.

Cons

• Not the tallest or most extreme cooler for hardcore overclocking; larger towers will still outperform it in absolute thermal headroom.
• All-black, performance-first design may disappoint users wanting RGB or showy styling.

Specifications

Model	PA120 MINI BLACK
Dimensions	125 x 110 x 135 mm (L x W x H)
Heatpipes	6 x 6 mm, fully plated black
Fan	120 mm TL-D12B PWM with S-FDB bearing
Fin material	Aluminium dual tower, 48 fins per tower
Base	CNC precision micro-engraved copper base
Compatibility	Intel LGA1150/1151/1155/1156/1200/1700/1851 and AMD AM4/AM5

Our Verdict

The Peerless Assassin 120 Mini Black is a strong pick for builders who need efficient cooling in a compact package; it balances a dual-tower, six-heatpipe design with a quiet 120mm PWM fan and durable black finish. For mainstream gamers and compact workstation users it offers very good value and reliable performance, though those chasing absolute overclocking headroom or RGB flair should consider larger or different models.

Frequently Asked Questions

Will this cooler fit in small cases?
At 135 mm tall it is designed to fit many mid-tower and small-form-factor cases, but measure your case clearance before buying.

Which CPU sockets are supported?
The cooler ships with mounting hardware for Intel LGA115x/1200/1700/1851 and AMD AM4/AM5 platforms.

Is the fan quiet under load?
Customers report the TL-D12B PWM fan runs quietly thanks to the S-FDB bearing and silicone vibration mounts while providing steady airflow.