I know this may sound lame, but I really am not sure. I have a Toshiba Satellite L45-54687. It came loaded with 1024MB DDR2 SDRAM and says that both memory slots may be occupied. Maximum capacity 2048MB. I want to buy some more memory to put into the second slot but not sure how much I can buy. Does this mean I can only buy 1024MB more (1G) or can I put a 2GB memory card in the second slot? Thanks for the help cause as you can see, I really need it!