I'm thinking about buying a 24 inch imac but there's something I'm not understanding about the RAM options. I'm on the apple Canadian store on their website and I have selected the 24 inch imac and I'm at the page where I can customize whatever options I want. For the RAM we have three options. By default it's set to 1GB. Then there's the upgrade to 2GB or ram which costs an extra $165 and after that there's the upgrade for 4GB which costs an extra $935. I'm not understanding how, when you upgrade from 1GB to 2GB, it only costs $165 for an extra GB but when you add an extra 3GB it costs about $311.67 for each additional GB. I don't know too much about the price of ram but it seems to me now that a GB of ram should be about $50 to $100. So why then would I not buy an imac with 1GB of RAM and then spend at most $300 for three additional GB of ram and just install it myself?