We've always known what PPC was good for. The problem with it wasn't that it wasn't powerful, it was that it used too much power and ran too hot to put in laptops.
That and IBM was favoring Microsoft, Sony, and Nintendo over Apple. Intel actually bent over backwards to land Apple (giving them new chips first/pretty far in advance). It was a combination of the PPC not being great at mobile and the AIM alliance finally completely falling apart. If it was just about mobile Apple wouldn't be using ARM for their iOS devices.
Well, I think that the dynamic changed a lot when GPU makers started providing generic tools. Even Apple who was behind quite a bit managed to get CoreCL out the door ~3 years ago.
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The only company that can make 'current generation desktop-class' CPUs and GPUs is AMD. Intel is usually a couple generations behind on their GPU tech, and NVidia doesn't have any desktop CPU experience. NVidia's track record on portable SOCs says they care more about specific high-performance platforms.
Eh, my crummy memory thought Intel bought someone to make their GPUs slightly less bad.
Speaking of Apple, is there any word if they're giving OpenGL more attention in 10.8?