Want to see what memory is fitted to your laptop or PC? Or if your machine has any vacant memory slots? Or maybe just to see what the speed and type of memory you already have and where it is?
Open a console with ctrl-alt-t
sudo lshw -class memory
If it scrolls the page then pipe it through less and get a read-only display you can scrollup and down. Like this:
sudo lshw -class memory | less
You get an out put that looks a bit like this: (after scrolling down a bit)