I am getting a Mac Pro from Apple with 1GB(2 x 512MB) of memory and I am also getting 3GB(2 x 1GB & 2 x 512MB) from DMS to install. I have read that when you install memory you need to put the largest in the first slot down to the smallest. I also read somewhere that you need to leave the apple supplied memory in the first slot or it will void your warranty. I am very new to all of this so any help would be appreciated.