<< the thing is, my comp is in a diff country, and i wanna buy ram in the states. So if i buy a stick of 256 pc100, will it work with a pc133 motherboard? Also, will I notice a considerable difference in performance IF my motherboard is pc133? >>
If you buy pc100 you will have to overclock your ram if you own a pc133 mobo. This may not work. But then again it could work. Best bet would till be pc133.