Volgens MacOS Rumors kunnen we in 2000 dual en quad versies van de PowerMac G4 verwachten. Apple wacht met de release totdat MacOS X op de schappen ligt. Het huidige MacOS 8.x bakt niet veel van multi-threading en dan heeft SMP uiteraard ook weinig zin:
Apple sources have confirmed that Apple does indeed plan to develop and ship dual as well as quad-processor G4 machines. These will be introduced in the next-generation desktop Mac, which should be introduced at next year's Macworld New York.
This remarkable machine, sometimes referred to (incorrectly) as "Shark," will be the first of the second-generation UMA Macs, and will sport a 133MHz main bus. The machine will also reportedly have several improvements -- including, if reports are to be believed, two processor sockets, each of which can contain a single or dual-processor card. Third parties might even be able to put quad-processor cards in each slot!
Apple's primary prerequisite for shipping multiprocessor G4 machines is not the hardware, but the software. Apple wants to have Mac OS X released and fully SMP (Symmetric Multi Processing) enabled before it ships MP hardware. This, of course, is because the company wishes to provide the best possible incentive for migration to OS X. If Apple were to ship an MP machine now, Mac MP would be poorly rated by the "experts," and there would be far less ammunition for the company to use when it has a fully SMP operating system.