I just got a new Mac Pro. I got the baseline quad and looking to upgrade the ram, but I am unsure about whether I need to do it in pairs, 3s or it doesn't matter. I am getting some conflicting opinions on it. The apple.com guy said he had no specs on it and theorized that I had to do it in 3s. Crucial told me it didn't matter ( I could do it in pairs, 3s or whatever I want). Does anyone have any definitive answers? Thanks a ton.