I just ordered a 2.8GHz Intel Core 2 Extreme with 2GB memory. I noticed you could upgrade to 4GB of Ram....for an extra 700 dollars! Is there only 2 ram slots available? Do I know have to get rid of my old 2GB(2x1g) and buy another 4GB (2x2g)? Why is it that apple charges an extra 700 dollars just for 2 GB of ram? I'm kind of confused and wondering why there's such a ridiculous price for something you can get at 1/4 of the price? PS: Are there any good Canadian sites for Ram?