Just doing the usual obsessive digging, trying to justify a 2009 vs. a 2008 mac pro, and I arrived at this web link at Digital Arts Online. Posted below are small entries of the article, and an especially eye-opening number for a comparison test with CS4. The difference in finishing the task is a significant 210%. (ahem). Digital Arts Online review "Photoshop is a very RAM hungry application, despite it being a 32-bit application that can access only 4GB of our Mac Pros 6GB of RAM -- 3GB for main app and 1GB for plug-ins. The new Mac Pro shot through our core Photoshop CS4 test, which applies 25 actions on a 500MB image -- including smart filters and 3D transformations. The Nehalem Mac Pro took 16 minutes 26s to complete the test -- compared to 34mins 32s for the older base dual-chop model. "