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  • There are plenty of ways you can get the lowdown on memory usage within your Linux system. In this roundup, we’ll cover the most commonly used command-line methods: free, vmstat, and top. We’ll also look at reading /proc/meminfo directly. How Linux Uses RAM.
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If you need a quick way to find out how much RAM your Linux system supports or to determine the number of DIMM slots available, you can use a command line tool called 'dmidecode'.

To find out the maximum RAM capacity and the number of RAM slots available, use the following command:

The output should look something like this:
The 'Maximum Capacity' is the maximum RAM supported by your system, while 'Number of Devices' is the number of memory (DIMM) slots available on your computer.
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To see complete memory information, including the info above along with currently installed memory information (RAM speed, size, etc.), use:

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Here's an example output for the command above:
You can also use lshw (among others) for this (firstly, install it; in Ubuntu: 'sudo apt-get install lshw):

It's important to note that Dmidecode reports system hardware information as described in the BIOS and does not scan your hardware, so in some cases the output can be wrong. Running dmidecode on my Dell XPS L702X non-3D laptop, the output says my system should have 4 RAM slots but in fact there are only 2 and only the 3D version of my laptop can have 4 RAM slots (and by the way, there are some Windows applications reporting the same thing), however, the command is accurate about it supporting 16 GB of RAM.

Also see: How To Get Hardware Information In Linux

This is our sixth post on getting hardware information. In this post we will see how to get RAM details such as size, speed, make, maximum capacity allowed RAM etc. We already covered some hardware related stuff in this series so far as given below.
Get BIOS, Firmware, Hardware And Drivers Details in Linux/Unix

Example1: Find RAM size(Total, available, used) in Linux. We can use below five methods to get details.
free

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Want to understand free command output? check our post on free command.

Output:

top

Check our excelent post to understand Linux top command output.

Output:

Output:

Output:

dmidecode –type memory
or
dmidecode -t 17

Output:

Example 2: Get RAM information like location, Maximum capacity of RAM supported, number of RAM devices present and sa lot info.

Output:

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Example 3: Find RAM information like Type of RAM(SD RAM or DDR2/3), Speed, Manufacture etc

Output:

In our next post in this series we will see BIOS and Processer details.

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Mr Surendra Anne is from Vijayawada, Andhra Pradesh, India. He is a Linux/Open source supporter who believes in Hard work, A down to earth person, Likes to share knowledge with others, Loves dogs, Likes photography. He works as Devops Engineer with Taggle systems, an IOT automatic water metering company, Sydney . You can contact him at surendra (@) linuxnix dot com.
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