this is from my experience. may b there r better ways. 1. refer to the computer device list. that came with the computer usually it lists. or 2. you can open the computer and look @ the reading on the RAM installed on the PCI slot of the motherboard. IT TELLS you whether it is SDRAM, RDRAM. It also tells u whether it is 168 pin or 184 pin. or [ usually INTEL PROCESSORS USE ONE OF THE FOLLOWING] PC66, PC100 or PC133. any who hope this helped.... ==================================================== as i used 2 say what do i know (o: