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A software which need 2GB RAM will may run with 512MB RAM [Not in a perfect way]. Today computers use virtual memory for multitasking [for running more programs at the same time]. An over-reliance upon virtual-memory can slow overall system performance. By enabling the virtual memory feature, you are asking the computer to use a part of the Hard Disk as Physical Memory [RAM]. Always remember that the Hard Disk is much slower than the original RAM. In this case, you are asking the computer to find the remaining 1.5 GB of RAM which is required to run the software from virtual memory and this will result in constant disk swapping or thrashing which will slow down your computer considerably. So, it is clear that 2GB of RAM is required to run that software in a smooth way and that is what the software developer want to see. That is why the minimum RAM required to run the software is set to 2GB.

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Q: A software of 2GB can run over a 512 MB of primary RAM available with the help of virtual memory.Then why is it written on the software that minimum RAM required for it is so and so?
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