Hello, I have a 17" Powerbook G4 1.67ghz with the ATI 9700 128mb video card and 1600x1050 screen. I am running Leopard 10.5.8. I love the computer but the video playback on it is terrible. Even youtube videos are choppy. I can watch standard definition video files but not 720p. It there anything I can do or it is just a limitation of the G4 chip and time to upgrade to an intel? Thanks!