Any CS/CEE program worth its salt uses the Computer Architecture book from Hennessy and Patterson. Besides the operating system chapter, the chapter on memory was one of my favorites. Enter Branch Education that created this really excellent video on how computer memory works.
Definitely worth the 35 minutes. It starts slow, but around section 8 it starts going fast and furiously through a lot of different concepts. Each builds on the previous, so you may need to pause and really make sure you grock what they said.