Hi i just want to know the difference between different RAM types. for example pc800,pc2100 or whatever what does it mean? coz i have a pc with 2 64mb pc800 RAM, i dont know if SDRAM or something else. i like to upgrade as you can see 128 MB RAM is really low when running an XP o.s. what RAM can i use other than pc800? or pc800 is the only memory i can use.