First off let me give a brief run-down of these basic features so you can better understand what they mean, and how they could potentially effect your buying experience and PC performance. For starters PC3200 means the same as DDR 400 and 200MHz memory. It is all the same thing, just different nomenclature (which really didnt become popular until pc2100 when the bandwidth doubled etc etc it is a long story, just learn to use these terms interchangeably). Personally I would rather them call the memory by its rated MHz, but they wouldnt do that because 3200 sounds FASTER than 200MHz...