That's the best feeling -- idly clicking through looking for that one rabbit hole to fall down then stumbling upon a gem like this. I noticed this the first time on copetti.org articles about game console architectures: know nothing, look every jargon or acronym up as you read along, end up with 42 tabs and a basic high-level understanding of the topic by the end.

That’s somebody’s highlighted copy of the PDF.

Here’s a clean version: https://people.freebsd.org/~lstewart/articles/cpumemory.pdf

This is talking about HBM/GDDR