I've been browsing around the web for quite some time and have been under the impression that the 7457 G4 is already utilized in the new 1.43 Ghz machines but just learned that that may not be the case after reading a little about the chip around the web. What chip is in the 1.43 Ghz machines and when do people expect the 7457 to be implemented into the newer machines (excluding upgrade manufacturers)?