linux: dmidecode: find ram type

I've bought a thinkpad T14 as a birthday gift for myself.

Later, I'd lite to add more RAM to it, but felt too lazy to disassembly the machine, and read the label on a memory bank.

Luckily, there is a dmidecode tool for this:

root@thinkpad# dmidecode --type memory
...
	Type: DDR4
	Speed: 3200 MT/s
	Manufacturer: SK Hynix
...

Then simply go google "hynix ddr4 16gb 3200 laptop", and throw some money into amazon.