I'm going to upgrade my imac G5 to 1GB of ram. I upgraded to a single stick of 512 when i bought it but i seems a bit slow. Here is the link to the ram specifications http://docs.info.apple.com/article.html?artnum=86814 and here is the link to the ram i'm going to buy http://www.compusa.com/products/prod...06218&pfp=cat3. This is my first mac. Is it a good idea to buy normal DDR for this thing, it says it's compatible.