What is virtual memory and how is it different than RAM?
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Most of your computer is just different layers of data storage. These layers are physically further from your CPU, and thus slower. The RAM is relatively close to the CPU and thus is quite fast.
Your HD (or SSD) is not only much further physically from the CPU, but due to the technology behind the HD storage, it is orders of magnitude slower than RAM.
Virtual memory, is just a method of pushing system memory, from the very quick RAM to the slower HD, which has pros and cons, HDs are larger and cheaper, but you lose a lot of performance, to name a few.
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