Just to be clear, you're seriously telling us that there haven't been any 'meaningful' updates to CPU's in ... FIVE YEARS?
If that really is the case - and it's debatable at best - then why update now? If the newest Mac models are so much faster than previous models, what is the difference?
I haven't said there haven't been ANY improvements in that time; clearly there have. But considering the sales of the Mac Pro and Mac mini, and the massive cost and resource-sucking of both the R&D process, and quite frankly, even more annoying, the Agency Approvals for a gazillion countries (each with their own agendas and procedures), the numbers just didn't "add up" (no pun).
But now, there really HAVE been some more significant improvements in Intel's CPUs and GPUs, and changes in I/O trends. And so it is starting to make sense. Not to mention that, as a practical matter, it's probably getting kind of hard to source some of the parts, like FireWire controllers, and I wouldn't be surprised to learn that Intel and/or AMD have maybe even EOLed critical components such as the CPU or GPU used in those machines.
But obviously, Apple isn't taking the easy way out (which they might not be able to do with the Mac Pro; but which certainly could be done with the mini) and just update the internals a little. So, IMHO, it will be quite interesting to see what rabbits are going to be pulled out of Apple's hat...
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Useless analogy: Cars don't have mechanical components that double in effectiveness every 18-24 months. Computers do have CPUs and components that double in speed every 18-24 months. Also cars have a completely different set of purposes from computers.
Wrong.
CPUs USED to follow Moore's Law (to which you are making a side-reference); but then, a funny thing happened: Physics got in the way.
Desktop CPUs haven't enjoyed a Moore's Law "curve" for nearly 10 years now. The performance gains year-over-year are marginal, at best.
I'm not saying we're "done" with CPU power increases; but at this point, we're scratching pretty hard at that ground to get even one new seedling to sprout.
And at some level, cars and computers are both means to an end; not an end unto themselves. They are both TOOLS. Nothing more; nothing less.