I have a Mac Pro Xeon 2.66 Quad Core and I like to get people's opinion on how long before my MP will be obsolete. The reason I am asking is because I can't decide if I should upgrade RAM to 4GB x 3 = 12GB or 8GB x 3 = 24GB. I read some Intel MacBooks can't upgrade to Mountain Lion. If my MP will soon be obsolete, perhaps in a 2-3 years, then I would just get 12GB of RAM to hold me over until I get a new MP. I video edit with Final Cut Pro X, use Motion, Aperture, Dreamweaver, use After Effects sometimes, Photoshop sometimes.