Problem:

I want to buy more RAM for installing in my computer. What kind of RAM I should buy?

Solution:

To solve it, you can determine the frequency and type of the current RAM installed in your computer.

Step by step:

  1. Open a Terminal.
  2. Type one of these commands: 
    sudo lshw -short -C memory

    You’ll get a table with the fields: H/W path, Device, Class, Description.

Source:

https://askubuntu.com/a/391178