How to check memory type and speed? [duplicate]
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)