There is basically 3 lines of desktops, 2 lines of notebooks. The desktops all have G4 cpu's and the powermac desktops (tower case) have AGP, DDR RAM, and most other modern technology. sadly the macs have been lagging, speed wise behind the PC for some things. That should change very soon when Apple announces new hardware based on a new CPU... Check out Apples site for details on the current macs.