Hi, I'm ready to upgrade my mac pro after a year with the factory 2GB's (2x1GB). I'm wondering what's the best way to install the new 2x4GB sticks and why? I'm excited and quite sure I won't notice the speed difference anyhow but it's a nice feeling to know that it's optimal! I've heard that the 4GB sticks should go first? As in A1, then B1, and then the 1GB sticks should be in A2, and B2? Is that correct? A=top riser B=bottom riser Oh yes! I have the early 2008 model.