# Computing - Harvard vs Von Neumann Architecture

> Source: https://ollybritton.com/notes/a-level/computing/topics/havard-vs-von-neumann/ · Updated: 2020-09-30 · Tags: computing, school, safe-to-post-online

##### What are the two types of architecture in computers??
* von Neumann
* Havard

##### Which computer architecture in the most common??
von Neumann architecture.

##### What is the von Neumann architecture?
Where instructions and data are stored in a common main memory and transferred using a single shared bus.

##### What is the Havard architecture??
Where instructions and data are stored in two seperate memories and each has a bus.

##### What is the main issue with von Neumann architecture??
Instructions and data are constantly competeting for use of the bus.

##### What consequence does Havard architechture have on the sizes of data and instructions??
Different sized memory spaces and word lengths can be used for data and instructions.

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