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Re:Metal – Apple’s new graphics API by modeless on Monday June 02, 2014 @09:27PM (#7837638)
> you can't replace the GPU

You can't replace the GPU on any current Mac either.

> Apple has full source code to the driver stack (and probably wrote most of it themselves

That's pure speculation, and I doubt it.

Re:Metal – Apple’s new graphics API by av500 on Tuesday June 03, 2014 @05:58AM (#7839068)
we worked with TI OMAP3 and 4 and we had the full source code of the driver stack, it was available under NDA. I am sure Apple has access to the same