Hello After using the search I am still a bit confused about RAM upgrades. I have bought a 2010 Mac Pro Quad Core (base model) and it came with 3x1 GB RAM. I then bought 2x2 GB RAM from Crucial. Now I'm unsure how to proceed. I know that the 2x2 GB should be in the top riser (Riser A) in the first two slots. But what about my old 3x1 GB sticks? Where to put them to get best performance? Many thanks in advance!