I know nothing about server hardware but I'm curious how that works.

I have a decent PC (AMD 3990X 64-Core Processor with 256 GB of RAM), I'd have installed better/more components but that seemed to be the best you could do on the consumer market a few years ago when I was building it.

Are they using the same RAM I'm using with a different motherboard that just supports more of it? Or are they using different components entirely?

Apologies for what I'm sure is a very basic question but it would be interesting to learn about.