Many reasons: * Intel vs nVidia legal battles have hurt Apple for sure. * Delays in new mobile chips. * Price * Apple hoped Larrabee would be a hit and intr

Many reasons: * Intel vs nVidia legal battles have hurt Apple for sure. * Delays in new mobile chips. * Price * Apple hoped Larrabee would be a hit and introduced Grand Central Dispatch etc. only to have Intel cancel it. Did Intel communicate early enough that Larrabee was not going to be feasible? * nVidia is not doing very well in the graphics department with their new Fermi parts being power hungry and slow compared to AMD/ATI's chips.