Great post called "Achieving 11M IOPS & 66 GB/s IO on a Single ThreadRipper Workstation" [1, 2] that basically walks through step-by-step that your computer is just a bunch of interconnected networks.

Highly recommend the post if you're into this and also sort of amazing how far single systems have come. You can basically do "big data" type things on this single box.

[1] https://tanelpoder.com/posts/11m-iops-with-10-ssds-on-amd-th...

[2] https://news.ycombinator.com/item?id=25956670