Geekworm 8mm Thickness Embedded Aluminum Alloy Heatsink (P165-A) for Raspberry Pi 4

Update: The P165-A heatsink was updated from 7 mm to 8 mm thickness on January 21, 2026.

Note:

• Geekworm is the original designer and manufactuer of P165-A, P165-B, C235 & C296 heatsink.
• Support customize the different specifications of standoff spacers for the heatsink! Please email us!!!
• If you are buying in bulk, please contact us to confirm the shipping cost!

Overview

Geekworm designed this embedded aluminum alloy armor heatsink specifically for the Raspberry Pi 4 Model B to address excessive heat generation when used with expansion boards. The heatsink also supports the installation of an additional cooling fan on top for enhanced heat dissipation. Now the heatsink thickness is 8mm.

User Manual: https://wiki.geekworm.com/P165

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Why design this product?

1. After the Raspberry Pi 4 was released, we found that the heat generation of Pi 4 also increased greatly with its performance. We have encountered many times that Pi 4 crashed due to excessive heat generation. This problem can be satisfactorily solved by use the Raspberry Pi 4 armor case: if not use other Pi 4 external expansion board.
2. At the same time, we found that various types of Raspberry Pi 4 expansion boards such as DAC+, UPS HAT, or various LCDs on the market also encountered excessive heat generation when used on Pi 4. So we try to solve this problem.
3. We refer to the design of the Raspberry Pi 4 armor case and simplified the design , so there is the birth of this Embedded Armor Aluminum Alloy Heatsink Radiator.

Why is it compatible with the use of expansion boards?

• The Embedded Armor Aluminum Alloy Heatsink Radiator is 8mm high (designed with negative tolerance) and is equipped with M2.5*5+5 copper spacers; so the total height is 13mm, which can support most of Raspberry Pi 4 expansion boards; if you use expansion board with other height, you only need to replace the copper spacers with the right height. (If you need a special height copper spacers, please contact us.)
• The raspberry pi hat positioning hole has internal thread for easy fixing from above or below;
• Compared to the Raspberry Pi PCB, the entire heat sink shrinks inward by 0.5 mm.

Key Features

• Model: P165-A

• Compatible only with Raspberry Pi 4 Model B

• Effectively cools the Raspberry Pi 4 when used with expansion boards (PoE HAT not supported)

• Includes a complete set of mounting screws and copper spacers for easy installation

• Raspberry Pi HAT mounting holes feature M2.5 internal threads, allowing convenient and secure fixation

• Supports installation of 25 mm cooling fans; an optional fan can be added when passive cooling is insufficient, ensuring optimal heat dissipation

• Heatsink dimensions: 6.5 × 5.5 × 0.8 cm (2.55 × 2.16 × 0.31 inches)

Packing List

for P165-A:

for P165-A + 2507 fan: