I purchased a Mac Pro two years ago and had additional ram installed at COMP USA (had an APPLE dealer in the store) The ram upgrade gave me a total of 9 gig. When I check (About This Mac) it confirms the 9 gig of ram. I was setting my preferences in Adobe CS 4 and when allocating the percent of ram to be dedicated to CS4 my choice was centered around 3 gig. Same as my Mac Book Pro. I elected 70% of 3 gig of ram. Any ideas from other CS4 - Mac Pro users as to what I can do, if anything, to confirm whether my computer is actually taking advantage of all installed ram? Is this an APPLE thingie or an Adobe thingie is my question? Thanks for all and any help on this.