I have 2 slots of RAM and I'm currently using one of them with 1GB. I tried seeking answers via crucial.com in this is what i got
http://www.crucial.com/systemscanner/viewscanbyid.aspx?id=3FFBD34631D926C3

It says there I have 2 types (DDR2 PC2-5300 and DDR2 PC2-6400)

I only want to buy one RAM to fill up my one extra but I don't know which type I should buy.
I don't even know the difference between PC2-5300 and PC2-6400 like how do i know which one I'm using now so that I know which one I need?