Heatsink Thermalright Peerless Assassin 140 — 120/140 mm fans, FDB, max 1500 RPM, 132×140×158 mm, black

Thermalright Peerless Assassin 140 is a CPU heatsink/radiator compatible with both 120 mm and 140 mm fans. The compact black cooler measures 132 × 140 × 158 mm and is designed to provide effective heat dissipation for desktop processors. It includes a C1100 pure copper nickel-plated heatsink and a fan with fluid dynamic bearing (FDB) that reaches up to 1500 RPM and delivers up to 66.17 CFM with a maximum static pressure of 1.53 mmH2O.

Advantages

The cooler combines a nickel-plated C1100 pure copper heatsink for efficient thermal conduction with a quiet S-FDB fan for stable long-term operation. Its support for a wide range of CPU sockets and compatibility with both 120 mm and 140 mm fan sizes make it versatile for different builds. Compact dimensions and black finish allow installation in common PC cases without dominating interior space.

Suitable for

• Air cooling of desktop CPUs in mid-tower and compact cases
• Systems requiring compatibility with LGA 1200 / 1700 / 1800 / 2011 / 2066 and AM4 / AM5 sockets
• Builds where moderate fan speed (up to 1500 RPM) and low noise are desired

Key specifications

• Product type: Processor heatsink/radiator for 120/140 mm fans
• Dimensions: 132 × 140 × 158 mm
• Fan size: 120 × 120 × 25 mm (supports 120/140 mm configuration)
• Fan bearing: Fluid Dynamic Bearing (S-FDB)
• Max fan speed: 1500 RPM
• Airflow / noise / pressure: 66.17 CFM, 25.6 dB, 1.53 mmH2O
• Heatsink material: C1100 pure copper, nickel plated
• Connector: 4-pin PWM
• Color: Black

How to use

Install the heatsink according to the motherboard and socket-specific mounting hardware included with the product. Mount a compatible 120 mm or 140 mm fan (the unit is supplied with an FDB fan) and connect the 4-pin PWM connector to the CPU fan header on the motherboard to allow speed control. Apply an appropriate amount of thermal paste between the CPU heatspreader and the heatsink base before fastening the cooler to ensure optimal thermal contact.

Usage recommendations

Use the 4-pin PWM header to enable automatic fan control; set BIOS or fan-control software curves to balance temperature and noise. Ensure sufficient case airflow and confirm clearance for RAM and other components before final installation.