Ok for starters just pretend I'm referring to a PPC mac. I say this because this forum is where all my knowledgeable friends hang out, and anywhere else the most help you'll get is a rude suggestion to buy a new computer. My Mac Pro 1,1 as delivered reported 4GB ram total, 2GB modules in slots B1 and B2, but in fact there were 3 2GB ram modules the odd one in slot B3. I've added 2 more 2GB modules in slots A1 and A2, and also removed the 3rd module from slot B3. Now my system correctly reports 8GB total. My question is... What can I do with the single 2GB leftover module? I think the answer will be to purchase another similar module and install the pair, really just looking for some confirmation on this. BTW this MP1,1 is a really sweet machine, I just love the modular design, the way HDD's just plug in like drawers, and just how almost silent it is when running.