I have been asked to look into upgrading the memory on the G5's we use at work. There are 4 of them all of which currently have 3g each but they are all different models. Not sure exactly what's what...we have been pretty busy lately so getting time to look at someone else's machine takes some planning haha but 2 of them currently have have 2x 512 and 2x 1g (BUT only have those 4 slots - I think these are dual 1.8's?) PC3200 Another one has 8 slots with 4x 256 and 4x 512's. All PC3200. The last has a bunch of open slots. Only has 2x 512 and 2x 1g. PC2-4200 So, my question is... Is it worth it for us to upgrade the memory on all these machines? We are using CS3 now and some things to be slowing up. Also - prices seem all over the place...can older memory be used in the more current machines or does it work the other way? Thanks a lot!