Von Neumann Architecture	Harvard Computer Architecture
The same physical memory is used to store instructions and data.	Separate physical memory is provided to store instructions and data.
It is based on the stored-program concept.	It is based on relay-based computer models.
Common bus for transferring instructions and data.	Separate buses are used to transfer instructions and data.
Two clock cycles are used to execute a single instruction.	A single clock cycle is used to execute a single instruction.
It is cheaper in comparison to Harvard architecture.	It is more expensive than Von Neumann’s architecture.
CPU can not access instructions and read/write at the same time.	CPU can access instructions and read/write at the same time.
It is used in personal computers and small computers.	It is used in micro controllers and signal processing