Its a MAC, its not supposed to be upgraded, they want you to go spend another $2000 and buy another one
They started using Intel chips in their systems
If the MAC does what you want it to do, then I'm happy for you. I will always be a PC man though, the simplicity and stability of MACs are a plus where as PCs may require more fine tuning due to the Micro$loth operating system/Wide variety of components available for them which don't always gell perfectly. I do like being able to upgrade components to my hearts content and the PC is perfect for that, plus custom cases which give you all the room/cooling in the world to do what you want to do. Audio has become a higher priority now so the PC will stay as it is for as long as possible, it has more than enough balls to run the latest games/video edit/sound edit and does so very fast, nothing slows down the solid state hard drive and massive 16 gigs of ram it has.