Tepid and BigDav are spot-on
You only need however much ram is necessary to "hold" whatever applications and documents you have working. That may be 1 GB or it may be 12 GB. (Well, 1 GB may be skimping even for someone like me who doesn't "tab"and doesn't "multitask") The amount of RAM that one needs depends on whether they have multiple applications open and have many documents open or "working" at any given time. If your RAM capacity is not exceeded such that it is frequently swapping files back and forth between RAM and swap files it has had to place on the harddrive, you would not benefit from additional RAM. If one wishes to make a significant increase in computer speed in this situation, their money would be better spent on...