How to Check RAM and SMBIOS information in Ubuntu

I wanted to see what RAM slots I had available to increase my RAM.  Instead of opening the box or relying on http://crucial.com to tell me I found this Linux command.

sudo dmidecode -t 17

The command is DMI decode and the first line in the man page says "tool for dumping a computer’s DMI (some say SMBIOS) table contents in a human-readable format."  Run dmidecode | pager to see BIOS information.