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Computer Organization & Architecture

Foundations of Computing7

Instruction Set Architecture5

Datapath & Control Unit4

Instruction Pipelining4

Memory Hierarchy7

Why can't we just build one giant, fast memory?
How cache actually works: blocks, tags and the address split
What happens when you write to cache, and what gets evicted?
Main memory: how RAM stores a bit as a leaking bucket of charge
Memory interleaving, and the read-only memory your computer boots from
Secondary storage: why your files survive being turned off
Virtual memory: giving every program its own private, pretend address space

I/O Interfaces & Interrupts5

Boot to Execution: The Full System Trace5

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Computer Organization & Architecture

Foundations of Computing7

Instruction Set Architecture5

Datapath & Control Unit4

Instruction Pipelining4

Memory Hierarchy7

Why can't we just build one giant, fast memory?
How cache actually works: blocks, tags and the address split
What happens when you write to cache, and what gets evicted?
Main memory: how RAM stores a bit as a leaking bucket of charge
Memory interleaving, and the read-only memory your computer boots from
Secondary storage: why your files survive being turned off
Virtual memory: giving every program its own private, pretend address space

I/O Interfaces & Interrupts5

Boot to Execution: The Full System Trace5

Learn Computer Organization & Architecture Memory Hierarchy

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Why can't we just build one giant, fast memory?

Fast memory is expensive and small. Cheap memory is huge and slow. The memory hierarchy is the compromise every computer makes, and locality is the reason the compromise works.

10 min readUpdated 2026-09-03computer-architecturememory-hierarchylocality