How do i know what memory i need for computer right now it has pc133 but dont know if i need different type or are they all the same and it doesnt say on memory. sodimm, sdram, non ecc not sure . or can i change from pc133 to to pc3200 etc
If you have pc133 right now chances are quite good that you need pc133. You can't just put in pc3200 or anything else.
If your board does support 2 RAM standards you can't use both at the same time. CPUz is a good way to see what you need if you aren't 100% sure it's PC100/133