My uncle got the newest pimped out 3.2 GHz mac pro. It came with 2 GB of RAM, 2x1gb i believe. He just got some more RAM in, 4x2GB. It seems that the sticks should be matched to the same slot on each board. So should I keep the original 1 GB sticks in slots 1 on each board, or should I bump them to the third slot in each board when I install this RAM for him? Thanks for your help, the guide wasn't this specific.