In general, do programs make appropriate use of available RAM? Let me explain... I have a mac pro with 4GB of RAM and almost never see any "Page Outs". I think this tells me that I have sufficient RAM. Now, say I go out and get another 4GB. Will my programs find a way to make use of the additional RAM and run faster or will be just be another 4GB that sits there and never gets used? It seems like there's actual memory usage and VM usage witch is always GB's above actual. If I added another 4GB (2 x 2GB) would VM go down as it makes more use of the additional physical RAM?