"Just weeks ahead of its public launch, Apple Inc. has updated the minimum system requirements for its next-generation Leopard operating system to exclude 800MHz PowerPC-based Macs."

Apple "had long stated in developer documentation that the software would require 'an Intel processor or a PowerPC G4 (800MHz or faster) or G5 processor."

But, "engineers for the company recently determined that Leopard installs on 800MHz PowerPC G4 systems ran 'too slow. Leopard will now require Macs with 'an Intel processor or a PowerPC G4 (867 MHz or faster) or G5 processor.'" Read