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I added more memory to the system but I didn't see any improvement in performance
Explanation: Additional system memory was added to the PC, but performance did not improve.
Diagnosis: Depending on the circumstances, this may be true and may not indicate any sort of a system problem. Assuming that the memory is configured properly and is recognized by the system, it may just be that you have reached the point of "diminishing returns" if the PC already has a fair bit of memory in it. Most people who have 8 MB of RAM and add another 8 MB, will experience a much greater relative performance improvement than if they have 48 MB and add another 48 MB. How much performance is affected by memory total depends to a large extent on what operating system and software you are using, and also how tight your memory total was before you upgraded. Recognize that small changes in performance, less than 10%, are generally not noticeable to most users. This is discussed in more detail here.