Harvard - Data and instructions are stored in separate memory units. There are distinct memory spaces for instructions (Program Memory) and data (Data Memory). This means that data and instructions are physically separated., Von Neumann  - Uses a single memory space for both instructions and data ,this means that instructions and data are stored together in the same memory unit (usually RAM). , HARVARD - Data and instructions are transported using separate buses, this separation allows for concurrent fetching of instructions and data, enabling higher throughput separation allows for concurrent fetching of instructions and data, enabling higher throughput. , VON NEUMANN - Data and instructions are transported over a single bus, so the same bus is used for fetching both instructions and data from memory. Fetching of instructions and data cannot occur simultaneously, which may introduce delays and decrease overall performance. ,

Computer Systems Architecture

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