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Installation Guide for Thermalright Peerless Assassin 120 CPU Cooler

Step-by-step installation guide for the Thermalright Peerless Assassin 120 CPU cooler. Includes mounting instructions for AMD AM4 and Intel LGA115X, 1200, 20XX, and 1700 sockets, along with fan wiring diagrams.

Table of contents

Quick Installation Guide

This guide provides the necessary steps to install the Thermalright Peerless Assassin 120 CPU cooler on various AMD and Intel platforms. Ensure you have identified your specific CPU socket type before beginning the installation.

Parts List

  • A: Heatsink
  • B: Fan
  • C: Fan Y-cable
  • D: Intel Bracket
  • E: AMD Bracket
  • F: Fan Clip
  • G: 115X Screw bolt
  • H: LGA20XX Screw bolt
  • I: Tightening Nut
  • J: Standoff
  • K: AM4 Screw
  • L: Thermal Grease
  • M: 1700 Screw bolt
  • N: LGA115X/1700 Backplate
  • O: Plastic pad
  • P: Screw bolt

AMD AM4 Installation

  1. Remove the original AMD plastic support, but keep the backplate.
  2. Lock the original motherboard backplate with the AM4 rubber column.
  3. Apply thermal grease to the CPU.
  4. Install the AMD brackets.
  5. Mount the main body of the cooler and secure it with a screwdriver.
  6. Attach the fans using the fan clips.

Intel LGA115X/1200 Installation

  1. Install the Intel backplate from the back of the motherboard.
  2. Place plastic standoffs from the front side of the motherboard.
  3. Install the Intel metal brackets with screws.
  4. Apply thermal grease to the CPU.
  5. Mount the main body of the cooler and secure it with a screwdriver.
  6. Attach the fans using the fan clips.

Intel LGA20XX Installation

Intel LGA20XX installation steps
Intel LGA20XX installation steps
  1. Thread the LGA20XX screw bolts onto the brackets.
  2. Tighten the screws.
  3. Apply thermal grease to the CPU.
  4. Mount the main body of the cooler and secure it with a screwdriver.
  5. Attach the fans using the fan clips.

Intel LGA1700 Installation

  1. Install the Intel backplate from the back of the motherboard.
  2. Place plastic standoffs from the front side of the motherboard.
  3. Install the Intel metal brackets with screws.
  4. Apply thermal grease to the CPU.
  5. Mount the main body of the cooler and secure it with a screwdriver.
  6. Attach the fans using the fan clips.

Fan Wiring

For optimal performance, connect the PWM fan cable to the CPU_FAN header on the motherboard. If using dual fans, use the provided Y-cable to connect both fans to the same header. For ARGB lighting, connect the ARGB cable to a 5V 3-pin ARGB header on the motherboard or an ARGB lighting controller.

Practical help

Common problems

ARGB lighting is not working

Ensure the ARGB cable is connected to a 5V 3-pin ARGB header on the motherboard. Do not connect to a 12V RGB header as this may damage the LEDs.

Fan speed is not being controlled

Ensure the PWM fan cable is connected to the CPU_FAN header on the motherboard, not a standard system fan header.

Before use

  • Verify all parts (A-P) are present in the box.
  • Identify your CPU socket type (AMD AM4, Intel LGA115X/1200/20XX/1700).
  • Ensure the CPU surface is clean before applying thermal grease.
  • Check for clearance issues with RAM modules before final mounting.

Images and diagrams

  • The manual provides distinct installation steps for each supported socket type.
  • The fan wiring diagram illustrates the use of the Y-splitter cable for dual-fan configurations.

Model compatibility

  • Supports AMD AM4 socket.
  • Supports Intel LGA115X, 1200, 20XX, and 1700 sockets.

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Manual page author

David Miller

Documentation analyst

Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.