---
title: "Raspberry Pi CM5 RAM Upgrade Failure | Hacker News"
description: "Via Hacker News: A Raspberry Pi enthusiast encountered a persistent issue when attempting to upgrade a Compute Module 5 from 2GB to 4GB of RAM. Despite solde..."
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### Raspberry Pi CM5 RAM Upgrade Failure

Hacker News • September 21, 2026 at 8:54 AM ET

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A Raspberry Pi enthusiast encountered a persistent issue when attempting to upgrade a Compute Module 5 from 2GB to 4GB of RAM. Despite soldering a new 4GB chip and sourcing a known-good donor module, the system continued to detect only 2GB. The user confirmed resistor modifications and SPI chip swaps were correctly implemented, ruling out common hardware errors.

The user noted previous success upgrading Pi 4 and Pi 5 generations, suggesting the problem may relate to factory bootloader settings or module-specific detection logic. The community is invited to share insights on why the operating system and hardware monitoring tools fail to recognize the physical RAM increase.

[Read original article](https://forums.raspberrypi.com/viewtopic.php?p=2380887#p2380888)

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