• XP has a memory max of 4GB. Anything beyond that and XP won't/can't address the memory, even with 4GB XP might only address like 3GB and reserve the rest for various hardware devices. To use more than 4GB you need 64-bit XP or any 64 bit operating system (there aren't many). So yes, there is a point of dimishing return or actually zero return when adding RAM. The big thing is are you really currently using a large percentage of your current available RAM. Check Task Mnager and see if just how much you are using now. If you have less than 50% free memory while your most used programs are open you will probably see a performance boost with more memory. Generally speaking there are so many variations in system configurations, (some PCs actually use part of RAM for video)... there is no one answer that applies to everyone's PC.

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