I'm not the brightest person when it comes too a computer. I can run them okay, but I don't know chit about how they work. I can do basic things like install memory, but I really don't know what it does. Okay, my computer has 2 slots for memory. Today I took out a 128 stick and replaced it with a 256 stick. I now have 512mb of memory. What does that do for me ??? I really haven't seen any difference. I know more memory is a good thing, but what have I gained for the $90.00 + tax I spent on more memory ???