Why did slot CPUs exist?

Why did slot-based Pentium II, Pentium III, and Athlon CPUs exist? Why did they disappear? It all has to do with the importance of cache performance and what was possible with the technology of the day. I'll dive really, really deep into many aspect of CPU and cache performance to make a case for why they existed and why they vanished.

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00:00 Intro
00:30 Data transmission performance
00:54 Bandwidth and latency
03:32 The Pentiums
05:22 The memory speed problem
10:34 Bus speed matters
12:23 P55C L1 cache advantage
13:10 How do we (not actually) go faster?
18:29 Direct mapped cache
24:11 Set associative cache
28:46 Lookin' at you, L2
32:50 CPU and cache on a board, take 1
35:33 Pentium Pro
43:30 CPU and cache on a board, take 2
45:23 But why vertical?
47:09 Slot B Xeon
49:22 A is for Athlon
51:03 On-die cache
53:43 Off-die cache?
55:25 On-die cache!!!
57:48 Closing words

Computer Architecture: A Quantitative Approach (these are Amazon affiliate links)

https://amzn.to/3SePOE9 or https://amzn.to/3OgYJnn

Image and video credits:

Drinking glass being filled:

   • Glass of water being filled up  

Worst fireman ever:

   • The Worst Fireman Ever | Ross Smith #...  

Flight of Apollo Saturn V:

   • Flight of Apollo Saturn V (archival f...  

Intel Coffee Lake die photo:

https://commons.wikimedia.org/wiki/Fi...

Pentium Pro "de-lidded" CPU:

https://commons.wikimedia.org/wiki/Fi...

Sequent computer room:

https://commons.wikimedia.org/wiki/Fi...

Sequent TPC benchmark submission info:

https://www.tpc.org/results/individua...

Crying face emoji:

https://commons.wikimedia.org/wiki/Fi...

Pentium II Xeon 450MHz:

https://commons.wikimedia.org/wiki/Fi...

Pentium II Overdrive "de-lidded" CPU:

https://commons.wikimedia.org/wiki/Fi...