Ask HN: What should every programmer know about memory nowadays?

[Elzair]

Ulrich Drepper's 2007 series of articles, What Every Programmer Should Know About Memory, is widely considered a must read. However, it was written 8 years ago (a lifetime in the tech world). What changes should the modern programmer be aware of?

[arisAlexis]

Programmers need to stress more about their own brain's memory speed and optimization that the pc's..