Why do CPUs Need Caches? – Computerphile

We’ve all heard of web browser caches, but why does a super fast modern CPU need a cache? Because it’s too fast. Dr Steve “Heartbleed” Bagley explains.

Professor Steve Furber on Building the BBC Micro:
How Computer Memory Works:
Why Asimov’s Laws Don’t Work:
The Problem with JPEG:

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham:

Computerphile is a sister project to Brady Haran’s Numberphile. More at

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