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This question already has an answer here:

I want to get more RAM for my computer, and I understand that to get the right type of RAM I have to know the memory type and speed (minimum and maximum as far as I understand). So how do I find these things out? And is there anything I need to know about the memory before I can get more RAM which will actually fit with the specifications of my computer? I am running Ubuntu GNOME 16.04 with GNOME 3.20.

Note: I know that there are Terminal commands to find out this information, I just can't remember what they are.

marked as duplicate by mikewhatever, Jacob Vlijm, TheWanderer, Byte Commander, heemayl command-line Jun 30 '16 at 18:51

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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You can use lshw to display memory information:

sudo lshw -c memory

It will display RAM as well as CPU caches, but you can quickly find the information you want.

One example memory module could look like this:

 *-bank:0
      description: SODIMM DDR3 Synchronous 1600 MHz (0,6 ns)
      product: ACR16D3LS1KNG/8G
      vendor: Kingston
      physical id: 0
      serial: 16392411
      slot: ChannelA-DIMM0
      size: 8GiB
      width: 64 bits
      clock: 1600MHz (0.6ns)