Originally posted by hvfsl
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I expect Apple to only do dual PPC970 Macs because it is alot harder to code Apps for 4 chips than 2.
Actually, for some applications, it isn't.
Take a web browser. each browser window (or tab) could be running in it's own thread. Therefore it has the possibility of using a lot of processors.
Take iTunes - right now it plays music and can burn a cd at the same time. That's two threads. It also responds to the mouse and jkeystrokes, including letting you update the MP3 tags on tracks.
Who knows what an application like iDVD could do with a 4-way system.
But to go back to your [incorrect] theory about coding difficulty - lets say an application could only take advantage of two processors. Well, what do you have running? Mail, iChat? Safari? iTunes? iPhoto or Photoshop? etc... This sounds like to me even with applications that were limited to two processors heavy users could make use of a 4 processor system.
What about a system used for DVD creation? That can easily use multiple processors.
And do remember, this was suggest for a professional level workstation. The applications that this was suggested for would be very likely be coded to use as many processors as were available.
Remember not everyone needs two processors either. I think a 4 processor Mac is a good idea for Apple to pursue.