I've got a 2 gHz MBC2D and it blows my 1.07 gHz iBook out of the water. I've got a 160gb Seagate 7200.2, and 3gb of ram. My iBook has a 160gb Toshiba 5200 and 1.25gb of ram. When I maxed out the ram and added the faster drive to my MB, I got a lot more performance out of it. Without, it seemed to drag.