I just thought that in general since current white macbook look identical to all previous generations of macbook, it has the same motherboard properties. So the question is, can I replace my 3rd generation MB's motherboard- x3100 graphics- with current mother board that has GeForce 9400m? I checked out ebay, and it has motherboards for MB, but I'm not sure if graphics card is intergrated into motherboard, and thus is sold with motherboard.