I would actually like to take issue that the Mac OS did not support
multi processors. I seem to remember several machines that were multi
processor from the 603e era, including one with 4 processors, if
memory serves, made by one of the clone manufacturers and I believe
the 8600 and 9600 were available with dual processors. These systems
ran from system 8.1 to 9.2.2 with multi processor support.

On Sep 9, 2:30 pm, John Niven <sense...@yahoo.com> wrote:
> --- On Wed, 9/9/09, ah...clem <boneheads...@gmail.com> wrote:
>
> > Bruce Johnson wrote:
> > > Len and Andreas clearly have more recent experience
> > than I on this
> > > subject; I'd go with their recommendations and stick
> > to the Dual 1 Gig.
>
> > i can only add my personal experience.  i do not use
> > the apps you
> > mention.  i do use apps (gaussian and spartan) that do
> > very CPU
> > intensive tasks, that can take hours, days, weeks, or
> > months to
> > execute a single instruction.
>
> I find this thread rather surprising. If you research the web, this used to 
> be a popular Mac question: should I buy the dual or the single? The answer 
> used to be that you would see no difference unless you were using one of the 
> few multiple processor aware apps (i.e. Photoshop). Indeed I understand that 
> DP macs were Apples desperate answer to the lack of faster processors from 
> their suppliers. The thing is these are all referring to the days of Classic 
> Mac OS which did not support multiple processors at all. Only when OSX came 
> along did you start to see any widespread benefit.
>
> Nowadays everybody has multi-core processors. This is because the designers 
> have given up trying to make them faster. So the future is multiple 
> processing.
>
> If you open "Activity Monitor" and select the "cpu history" window it shows 
> you the level of activity for each cpu. I was just watching a video on-line:
>
> http://www.guardian.co.uk/travel/2009/sep/09/cycling-tour-of-britain-...
>
> and it maxed out BOTH cpu bars. So I rather fancy that I'd prefer a slower 
> dual than a faster single.
>
> Or is "Activity Monitor" lying to me?
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