Linux memory spd information

Linux Check Ram Speed and Type Commands

H ow do I check RAM speed and type (line DDR or DDR2 or DDR3 or DDR4) without opening my computer? I need to purchase RAM and I need to know the exact speed and type installed. How do I find out ram information from a shell prompt? How can I check ram speed in Linux?

You need to use biosdecode command line utility. Dmidecode is a tool or dumping a computer’s DMI (some say SMBIOS) table contents in a human-readable format.

Tutorial details
Difficulty level	Easy
Root privileges	Yes
Requirements	None
Est. reading time	1m

The output contains a description of the system’s hardware components, as well as other useful pieces of information such as serial numbers and BIOS revision. This command works on Linux, UNIX and *BSD based computers.

Linux check ram speed and type commands

The procedure is as follows:

1. Open the terminal application or log in using ssh command.
2. Type the “ sudo dmidecode —type 17 ” command.
3. Look out for “Type:” line in the output for ram type and “Speed:” for ram speed.

Installation

Use the apt command/apt-get command to install dmidecode on a Debian or Ubuntu Linux:
sudo apt install dmidecode
Fedora Linux user, type the following dnf command:
sudo dnf install dmidecode
CentOS/RHEL/Oracle Linux user, run the following yum command:
sudo yum install dmidecode
SUSE/OpenSUSE user, run the following zypper command:
sudo zypper install dmidecode

How to check ram speed and type on Linux or Unix-like system

Open a shell prompt and type the following command as root user:
$ sudo dmidecode —type 17
OR
$ sudo dmidecode —type 17 | more
Sample output:

You can just grep speed (see grep command) and skip all other the details using the following syntax:

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Say hello to lshw

You can use the following command too:
$ sudo lshw -short -C memory
Sample outputs:

Another outputs from my work laptop:

Finding the frequency and type of my current RAM in Linux

Conclusion

You learned how to find out ram speed and other information using Linux and Unix terminal commands.

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Comments on this entry are closed.

lol; i like you’re site and your howto’s very very much. However, now I know I have to follow your stuff with an unknown type of ram, at an unknown speed. lol

seriously, keep up the good work! 😀

If only there was a way to see what rank it is too :(.

I’m using Ubuntu 8.10 alpha 3 32bits.
Using dmidecode I get the following results:
jp@jp-desktop810:

$ sudo dmidecode –type 17
[sudo] password for jp:
# dmidecode 2.9
SMBIOS 2.2 present.

Invalid entry length (0). DMI table is broken! Stop.

$ sudo dmidecode –type 17 | more
# dmidecode 2.9
SMBIOS 2.2 present.

Invalid entry length (0). DMI table is broken! Stop.

So, dmidecode is same version, SMBIOS is 2.2 instead of 2.4. And I didn’t get the information from dmidecode.

You may need to report bug to Ubuntu team. There is not much we can do to fix this issue.

I get only this:

# dmidecode 2.9
SMBIOS 2.3 present.

and no more info!
Tried both commands.
How can i get info like size, speed, type etc. ?

dmidecode –type memory

This should work as well 🙂

You can try using the following command combination and see if that works:

dmidecode |grep -A20 ^Memory

Gagan Brahmi,
Thanks, works well. 😛

I am using Fedora 9. 2.6.25.14-108.fc9.i686
Intel(R) Pentium(R) 4 CPU 3.00GHz
Here is the dmidecode –type 17 output.
No type and speed info.

# dmidecode 2.9
SMBIOS 2.3 present.

Handle 0x0028, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0027
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: A0
Bank Locator: Bank0/1
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: None
Serial Number: None
Asset Tag: None
Part Number: None

Handle 0x0029, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0027
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: A1
Bank Locator: Bank2/3
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: None
Serial Number: None
Asset Tag: None
Part Number: None

Handle 0x002A, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0027
Error Information Handle: Not Provided
Total Width: 64 bits
Data Width: 64 bits
Size: 1024 MB
Form Factor: DIMM
Set: None
Locator: A2
Bank Locator: Bank4/5
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: None
Serial Number: None
Asset Tag: None
Part Number: None

Handle 0x002B, DMI type 17, 27 bytes
Memory Device
Array Handle: 0x0027
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: A3
Bank Locator: Bank6/7
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: None
Serial Number: None
Asset Tag: None
Part Number: None

What will be the problem?

Is this a white box?? That is what I can make out. Just try the following command to see the server model:

dmidecode –type system
or
dmidecode –type 1

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5 commands to check memory usage on Linux

Memory Usage

On linux, there are commands for almost everything, because the gui might not be always available. When working on servers only shell access is available and everything has to be done from these commands. So today we shall be checking the commands that can be used to check memory usage on a linux system. Memory include RAM and swap.

It is often important to check memory usage and memory used per process on servers so that resources do not fall short and users are able to access the server. For example a website. If you are running a webserver, then the server must have enough memory to serve the visitors to the site. If not, the site would become very slow or even go down when there is a traffic spike, simply because memory would fall short. Its just like what happens on your desktop PC.

1. free command

The free command is the most simple and easy to use command to check memory usage on linux. Here is a quick example

The m option displays all data in MBs. The total os 7976 MB is the total amount of RAM installed on the system, that is 8GB. The used column shows the amount of RAM that has been used by linux, in this case around 6.4 GB. The output is pretty self explanatory. The catch over here is the cached and buffers column. The second line tells that 4.6 GB is free. This is the free memory in first line added with the buffers and cached amount of memory.

Linux has the habit of caching lots of things for faster performance, so that memory can be freed and used if needed.
The last line is the swap memory, which in this case is lying entirely free.

2. /proc/meminfo

The next way to check memory usage is to read the /proc/meminfo file. Know that the /proc file system does not contain real files. They are rather virtual files that contain dynamic information about the kernel and the system.

Check the values of MemTotal, MemFree, Buffers, Cached, SwapTotal, SwapFree.
They indicate same values of memory usage as the free command.

3. vmstat

The vmstat command with the s option, lays out the memory usage statistics much like the proc command. Here is an example

The top few lines indicate total memory, free memory etc and so on.

4. top command

The top command is generally used to check memory and cpu usage per process. However it also reports total memory usage and can be used to monitor the total RAM usage. The header on output has the required information. Here is a sample output

Check the KiB Mem and KiB Swap lines on the header. They indicate total, used and free amounts of the memory. The buffer and cache information is present here too, like the free command.

5. htop

Similar to the top command, the htop command also shows memory usage along with various other details.

The header on top shows cpu usage along with RAM and swap usage with the corresponding figures.

RAM Information

To find out hardware information about the installed RAM, use the demidecode command. It reports lots of information about the installed RAM memory.

Provided information includes the size (2048MB), type (DDR2) , speed(667 Mhz) etc.

Summary

All the above mentioned commands work from the terminal and do not have a gui. When working on a desktop with a gui, it is much easier to use a GUI tool with graphical output. The most common tools are gnome-system-monitor on gnome and
ksysguard on KDE. Both provide resource usage information about cpu, ram, swap and network bandwidth in a graphical and easy to understand visual output.

A Tech Enthusiast, Blogger, Linux Fan and a Software Developer. Writes about Computer hardware, Linux and Open Source software and coding in Python, Php and Javascript. He can be reached at [email protected] .

66 thoughts on “ 5 commands to check memory usage on Linux ”

You have explained the topic very well. Thanks for sharing a nice article.

Thanks for these commands. It saved a lots of time.

How about explaining what we are looking for? Most people would know these commands. Waste of time.

Please correct the typo in “RAM Information” section. The command for viewing hardware info about RAM is “dmidecode” and not “demidecode”.
And it also requires root privileges.

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Есть ли в этом нашем линуксе такая простая фича, как узнать частоту памяти?

Я создавал похожий тред раньше, там megabaks советовал грепать /dev/mem, но у меня это не сработало.
В общем, я хочу программу, суть такова: у меня сейчас dmidecode, lshw и т.д. показывают Current speed: 1333MHz, при том, что спеки на процессор указывают максимум в 1066MHz, производитель указывает тоже 1066MHz как максимальные, но установил ппочему-то 1333-модули.
Я, конечно, понимаю, что маркетологи таких крупных корпораций, как dell, лезут не в свои дела, но какого хрена пихать память, которая не будет работать на нужной частоте? Конечно, понятно, какого хрена, но все равно.
А может, все-таки 1333 и есть? Как узнать достоверно? Что, гуглить какой-то ассемблерный говнокод и тратить все выходные на правку@компиляние в надежде, что получится? Я же всего-навсего хочу памяти докупить!11

Ну вот например.

Я же всего-навсего хочу памяти докупить

ээ. открыть и посмотреть какая память стоит не?

Это ты свои три звезды таким тупняком нафлудил? Я же написал, что у меня показывает lshw. У меня в спеках на процессор написано, что максимальная частота памяти — 1066 МГц, а lshw выдает 1333. КАКТАК??777

Лол, еще один. Я знаю, какая стоит. Стоит на 1333МГц. Короче, я не буду третий раз писать, просто подумай головой, в чем дело.

У меня в спеках на процессор написано, что максимальная частота памяти — 1066 МГц, а lshw выдает 1333. КАКТАК??777

Ну и? Память быстрее проца. Что не так-то?

Очень просто. Инфа берется по id слота памяти, а для нее указано, что макс. частота 1366.

Поэтому тебе нужна тулза, которая смотрит данные с шины, а не из БД.

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