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Although memory and CPUs are linked together very closely, a CPU is only important to memory when the memory is active. It is the CPU that writes to and reads from memory (or other devices that are under the control of the CPU). When the memory is idle, its only function is to retain data ready for it to be written over or read. In almost all cases. memory can do this without any intervention by a CPU. In volatile memory, a power supply needs to be provided to retain the data. Non-volatile memory on the other hand will stored data without power. An example of this kind of memory is a USB drive that can be unplugged from a USB port and retain all data without needing either a power supply or a CPU.

Memory in fact is rather more important to the CPU than the other way round. The CPU operates as directed by a program that is stored in memory. Without memory, a CPU will not have a program to run so will not be able to fucntion.

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