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They could do this, but their market isn't typically gamers (even though plenty of games run well on OSX these days), and it'd probably be a viable alternative to having a Mac Pro and a quad-core rMBP.

So, their reasoning is probably similar to why Intel doesn't do it in the first place: it would eat into the sales of other more niche products. Lame.

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That said, Apple has demonstrated they're not averse to new product lines eating into other existing ones, as with the iPhone 6 taking some sales away from the iPad family, and in turn, the iPad mini away from the full-size iPads.

I doubt anyone expects them to actually come through with an external GPU option, of course, but it'd certainly be of interest to me, given Second Life's stiff requirements for long draw distances with all the lighting options enabled.

I doubt a gamer would buy a Mac Pro for a gaming rig.

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