Is there a way to put 32GB of memory in a PM G5 Quad? I don't have enough money for a Mac Pro, and I am just curious if that were possible. Also, is the card that I have in mine (Quadro FX 4500) the best card available for the PowerMacs? One more question... does anybody see a realistic speed difference between the 16x Superdrive and the new 18x in the Nehalem MPs? I would like to keep my powermac for as long as possible (even though its outdated) and put the best upgrades available in it.