I have a 1999 Powerbook G3 333 mhz. It currently has 360 mbs of ram. I have heard that a computer can only use so much RAM so if you put in more than it is rated for it would just be a waste. I'm not sure if this is true or not. I was wondering if this is true and if it is how much can it acctually use. One guy on this board said I should put in 2 512mb SO-DIMMs and I was wondering if this would be too much or not. That would be great if I could. Also where is the cheapest place to get RAM? I would appreciate any help I could get. Thanks in advance.