I want to buy an ibook, but I'd like to get more than the 256MB of memory. Can someone explain to me how memory works in the ibook? Crucial says there is 1 slot in the comp. This means I would replace the stock ram with a larger dimm. But Apple says on their BTO page: "Standard memory on iBook is 256MB of DDR266 SDRAM built-in. Expand memory up to 1.25GB of RAM by using the SO-DIMM slot, which can accommodate up to one 1GB SO-DIMM memory chip." This makes it sound like their upgrade is in addition to the standard 256 chip. 1 GB+256MB= 1.25 GB What's the deal?