Is there much speed difference between the iMacs?

Just wondering, if there is any noticeable performance difference between the 1.83 - the 2.0 and the 2.16?
I'd be surprised to learn that there was (and also, keenly interested to learn).
My experience is that a dual processor is noticeably more capable than a single processor (regardless of minor increments at the end of the processor number).
Anyone?

You are right that it is more about futher differentiating the models than anything else. The speed difference is negligible, but a nice plus is you choose a larger display. Typically you also get a larger standard HD and maybe a better video card and if you add all those things up, the price difference is worth it.

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