Find out what RAM type you have in Linux

To check what RAM memory type yo have installed (and also see other useful information about your system), do a
sudo dmidecode
Depending on the version of dmidecode you have installed and the hardware configuration you have, each hardware device will have a certain type number assigned t it. On my machine, the RAM has type 6. So to see what RAM type and speed you have, do a

sudo dmidecode --type 6

and the output will be something like
# dmidecode 2.9
SMBIOS 2.3 present.
Handle 0×0008, DMI type 6, 12 bytes
Memory Module Information
Socket Designation: ROW-0
Bank Connections: 1 0
Current Speed: 800
Type: DIMM SDRAM
Installed Size: 256 MB (Double-bank Connection)
Enabled Size: 256 MB (Double-bank Connection)
Error Status: OK

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