I have a Mid 2007 iMac. It is going to be 8 years old this August. It shipped with OS X Tiger and is running Yosemite.
The 2.0 GHz Core 2 Duo in it benchmarks at less than half of what the new MacBook's Core M does. It also has half the RAM installed.
And you know what, it still does work. Granted, I did put an SSD in it.
I'm pretty sure the new MacBook will at least last 5 years into the future as I expect
ANY new mac to do. Integrated graphics have vastly improved from where they were (GMA 950/X3100 I'm looking at you), and the architecture is pretty much the same as any other Intel chip capabilities wise. I don't think it will be an issue going forward.
Compare my 2007 iMac to my 2005 iBook G4. Both shipped with Tiger, one only got a single OS X upgrade to Leopard, and the other is still going 8 years later.
With the current tech out there, I'd expect nothing less than 5 years of OS X updates. Hopefully more like 6-7. 8 Just seems like a bonus, but why stop there? I'd love to see our iMac get the next OS X, if possible. Yosemite runs quite smooth and fluid for the age of the Mac. And especially for something that has ran
7 versions of OS X.
There are some benchmarks for the 1.1 GHz Core M out there. Here's a quick chart comparing it with the CPU in my iMac and rMBP I'm using (Late 2013). It isn't
that much worse than the i5, but also over 2x faster than the iMac, as it should be. Keep in mind this iMac runs Photoshop, Aperture, iMovie, Office/iWork, web browsers, iTunes and the like perfectly fine. I used to use FCP on it too. If this ancient iMac can handle it, I'm sure the new MacBook will be alright. But it's not quite so likely to be used for heavy lifting in the first place.
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