I just bought more crucial ram and I received one 512 pc2100 that looked different from the old ones that I had. Instead of having an empty spot in the middle the modules were larger and the empty spot was gone. The serial # on this stick was CT6464Z265.16T3 I was wondering if there's any difference between 16T-16T3. I have 2 16T's and 1 16T1 with a 16T3. All sticks have Micron modules. Is one better than the other? Thanks