[citation][nom]__-_-_-__[/nom]Most notebooks have 2 sodimm slots but there are several ones that allow 4 slots or even 6 slots. and you are just limited by the graphic card. nothing more. you can upgrade everything else.[/citation]
you you can upgrade most parts in a laptop, but the companies that make them often glue the sections of the plastic case together (like the top and bottom of my laptop are melded together somehow, probably plastic cement or something) so its a pain in the ass to upgrade them and when you do the cse doesnt fit together as snugly.