If Apple did in fact make a bigger can, with room for regular GPUs, wouldn't that ruin the design?
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The nMP is all about the design, you could never fit 2 regular cards, and have the video (TB) ports laid out like they are now, with such a clean design. And this is in fact something I really love about the nMP actually.
Out with all the legacy ports and "normal" stuff, start with a clean slate.
Sure it makes upgrades almost impossible, but this an Apple machine, you're not supposed to be messing around it's insides
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If you don't mess around with it, it won't (hopefully) brake on you, controlled ecosystem.
Before you come down on me, I'm not saying this is how it's supposed to be, but I must confess that my days of building rigs and overclocking are gone, I now prefer something stable, quiet and cool looking as a plus.
But I do agree Apple should then have another machine that can be easily upgradeable, for those who want or need to. Too bad this is not, or I believe ever was, the Apple way, even with the cMP I don't think they want you messing around those as well.