I have 2007 Mac Pro with 2GB I'm looking to increase the RAM but am not sure how much to get and in what quantity. The 2GB I have at the moment are created from 4, 512MB sticks. This leaves another 4 slots that I can stick RAM into. I've checked out the Crucial website and was looking around. What I'm thinking about is the amount I should get, how many sticks it is and if I'll need anymore in the future. Any advice would be great.