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[BUG] Memory size doesn't show the number I expect#2028

Unanswered
Tina-otoge asked this question inQ&A
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Read the FAQ first

  • I have checked the FAQ but the issue is not covered

Description

I have a machine with 64 GiB of RAM installed. Fastfetch displays it as 62.40 GiB.

I tried changing binaryPrefix, thinking it was just a matter of GiB vs GB, but withsi I get 67.00 GB, withjedec 62.40 GB.

--format json gives:

..."type":"Memory","result": {"total":67004215296,...

Which converted from B to GiB, indeed gives 62.40.

cat /proc/meminfo gives:MemTotal: 65433804 kB

For reference,htop also shows62.4G.

However, if I go in GNOME Settings, then System > System Details, it displays:

Memory
64.0 GiB

I have no idea why GNOME is the only one that gets it right, and would love for fastfetch to get it right too.

Version used

fastfetch 2.54.0 (x86_64)

Bug prevalence

Always

Regression

Not sure

Installation

GitHub Releases

Package manager

No response

Screenshots

No response

Configuration

System information

Details
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Features built-in

Details
threadsvulkanwaylandxcb-randrxrandrdrmdrm_amdgpugiodconfdbusimagemagick7imagemagick6zlibsqlite3rpmeglglxopencllibpulselibddcutillibelflibzfsDirectx Headerslinux/videodev2linux/wirelessEmbedded pciids
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Comment options

Both are correct. 62.4 GiB is the usable memory size (kernel reserves some memory for internal use), and 64 GiB is the physically installed memory size.

To get the physical memory size, you should usesudo fastfetch -s physicalmemory (root permission is necessary)

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@Tina-otoge@CarterLi
Converted from issue

This discussion was converted from issue #2026 on October 27, 2025 02:19.


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