Ok first of all I have a Toshiba Satellite 4090xDVD. When I got it, it didnt come with any memory. I know its gonna use SO-DIMM but what I dont know is what kind like how much (512, 1g) it can take and all will fit this laptop. I looked on Toshiba's website but couldnt find no info on what type of mem to use. If anyone could tell me I would really appreciate it. Thanks in advance.