How To Find Out Maximum Supported RAM In Linux

Find Out Maximum Supported RAM In Linux
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You want to upgrade the Memory to your newly purchased Computer or old system, and you have no idea about the maximum supported RAM by your system, what will you do? Of course, you can get the specifications from the system catalog, manuals, and system vendor’s website. But, it is not necessary. Here is two effective methods to find out maximum supported RAM in Linux.

1. Find Out Maximum Supported RAM In Linux using Dmidecode

From the man pages, Dmidecode is a tool for dumping a computer’s DMI (some say SMBIOS) table contents in a human-readable format. This table contains a description of the system’s hardware components, as well as other useful pieces of information such as serial numbers and BIOS revision. Using Dmidecode, you can retrieve this information without having to probe for the actual hardware.

Dmidecode is available in most Linux distribution’s default repositories.

To install it in Arch Linux and its derivatives, run:

sudo pacman -S dmidecode

On Debian/Ubuntu/Linux Mint:

sudo apt-get install dmidecode

On RHEL/CentOS/Scientific Linux/Fedora:

sudo yum install dmidecode

Or,

sudo dnf install dmidecode

On SUSE/openSUSE:

sudo zypper in dmidecode

Once Dmicode installed, run the following command to find out maximum supported RAM by your system:

sudo dmidecode -t 16

Sample output:

# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 2.6 present.

Handle 0x0014, DMI type 16, 15 bytes
Physical Memory Array
 Location: System Board Or Motherboard
 Use: System Memory
 Error Correction Type: None
 Maximum Capacity: 16 GB
 Error Information Handle: Not Provided
 Number Of Devices: 2

sksk_001

As you see in the above output, the maximum supported RAM size is 16 GB, and the number of available RAM slots (DIMM) are 2.

You might want to the currently installed RAM size. To do so, run:

sudo dmidecode -t 17

Sample output:

Getting SMBIOS data from sysfs.
SMBIOS 2.6 present.

Handle 0x0017, DMI type 17, 28 bytes
Memory Device
 Array Handle: 0x0014
 Error Information Handle: 0x0000
 Total Width: Unknown
 Data Width: Unknown
 Size: No Module Installed
 Form Factor: DIMM
 Set: None
 Locator: DIMM_B
 Bank Locator: BANK 2
 Type: Unknown
 Type Detail: None
 Speed: Unknown
 Manufacturer: Not Specified
 Serial Number: Not Specified
 Asset Tag: Not Specified
 Part Number: Not Specified
 Rank: Unknown

Handle 0x0015, DMI type 17, 28 bytes
Memory Device
 Array Handle: 0x0014
 Error Information Handle: 0x0000
 Total Width: 64 bits
 Data Width: 64 bits
 Size: 4096 MB
 Form Factor: SODIMM
 Set: None
 Locator: DIMM_A
 Bank Locator: BANK 0
 Type: DDR3
 Type Detail: Synchronous
 Speed: 1067 MHz
 Manufacturer: 014F
 Serial Number: 00092AF2
 Asset Tag: 54114000 
 Part Number: JM1066KSN-4G 
 Rank: Unknown

sksk_002

As you see in the output, my system has two DIMM slots and 4 GB RAM is installed in one slot. My RAM type is DDR3 and speed is 1067 MHz. The other one is empty.

Alternatively, run any one of the following command to display your system’s Memory details.

sudo dmidecode -t memory

Sample output:

# dmidecode 3.0
Getting SMBIOS data from sysfs.
SMBIOS 2.6 present.

Handle 0x0014, DMI type 16, 15 bytes
Physical Memory Array
 Location: System Board Or Motherboard
 Use: System Memory
 Error Correction Type: None
 Maximum Capacity: 16 GB
 Error Information Handle: Not Provided
 Number Of Devices: 2

Handle 0x0017, DMI type 17, 28 bytes
Memory Device
 Array Handle: 0x0014
 Error Information Handle: 0x0000
 Total Width: Unknown
 Data Width: Unknown
 Size: No Module Installed
 Form Factor: DIMM
 Set: None
 Locator: DIMM_B
 Bank Locator: BANK 2
 Type: Unknown
 Type Detail: None
 Speed: Unknown
 Manufacturer: Not Specified
 Serial Number: Not Specified
 Asset Tag: Not Specified
 Part Number: Not Specified
 Rank: Unknown

Handle 0x0015, DMI type 17, 28 bytes
Memory Device
 Array Handle: 0x0014
 Error Information Handle: 0x0000
 Total Width: 64 bits
 Data Width: 64 bits
 Size: 4096 MB
 Form Factor: SODIMM
 Set: None
 Locator: DIMM_A
 Bank Locator: BANK 0
 Type: DDR3
 Type Detail: Synchronous
 Speed: 1067 MHz
 Manufacturer: 014F
 Serial Number: 00092AF2
 Asset Tag: 54114000 
 Part Number: JM1066KSN-4G 
 Rank: Unknown

dmidecode-memory

To view the complete system hardware details, just run:

sudo dmidecode

Please note that some chipset and BIOS may not provide accurate information. However, you might get quite accurate details from server grade hardware.

For more details, refer man pages.

man dmidecode

2. Find Out Maximum Supported RAM In Linux using memconf

memconf is a simple perl script that displays memory modules installed in a Linux, Unix, Sun/Oracle Solaris, and HP-UX system.

Make sure you have installed perl before using this script.

To install perl on Arch Linux and its derivatives, run:

sudo pacman -S perl

On Debian / Ubuntu / Linux Mint:

sudo apt-get install perl

On RHEL / Fedora / CentOS / Scientific Linux:

sudo yum install perl

Or,

sudo dnf install perl

After installing perl, download memconf script using command:

wget https://sourceforge.net/projects/memconf/files/V3.12/memconf-v3.12.pl.gz

Extract the zip using command:

gunzip memconf-v3.12.pl.gz

Finally, run memconf script as shown below.

sudo perl memconf-v3.12.pl

Sample output:

 memconf: V3.12 07-Oct-2016 http://sourceforge.net/projects/memconf/
 hostname: sk
 Dell Inc. Inspiron N5050 (Dual-Core Hyper-Threaded Intel(R) Core(TM) i3-2350M @ 2.30GHz)
 Memory Error Correction: None
 Maximum Memory: 16384MB (16GB)
 DIMM_A BANK 0: 4096MB 1067MHz Synchronous DDR3 SODIMM, AMD JM1066KSN-4G
 empty memory sockets: DIMM_B BANK 2
 total memory = 4096MB (4GB)

sksk_005

As you see above, the maximum supported memory is 16 GB.

For more details, refer memconf homepage.

That’s all for now guys. If you find this guide helpful, share it on your social networks, so others can also benefit.

Cheers!

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