If you are on a budget like most are and you cannot pass up a “grab bag” or “misc bin” of used laptop ram at the electronics recycle or used electronics place here is a way to do a quick and dirty sort. Notice the notch locations on the ram in the picture ? From top they are PC3, PC2, DDR and just to make make sure you’re paying attention…PC133. My trusty tape measure gives you a size reference in the measuring units of your choice! Use the human tendency to see patterns to your advantage!
The Laptop Attic 