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Primary memory is that which is directly connected to the motherboard for the CPU to process, meaning your RAM modules. Secondary memory is located on the hard drive in a virtual memory (called a page file or swap file) when the RAM modules have no more room to store data that is still running, but still needs to recall some as soon as it can swap out what processes have the higher priority.

When the RAM and page file are full, you will notice a lag in computer performance as it struggles to process so much data at one time. If it exceeds the limits of your memory and processor, the system may crash. A fixed large swap file and more memory makes the CPU work less and a better, faster CPU will keep the memory demands lower. This is why more memory and a faster CPU is needed for more complex data processing. To reduce processing even further, a dedicated graphics card with it's own memory and built in CPU that handles the graphic processing allows for the RAM and CPU to work much less, making the computer much more faster.

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