I'd think that apple would be definitely considering and trying as many options as possible. The GPU is a significant source of heat and size, as it's like another processor. So, I'm sure apple is on it regarding prototypes and such, and will do whatever it takes. As much as they may want to stay with ATi for whatever reasons, if the Geforce can provide comparable and/or better performance while being smaller and/or producing less heat, then I'm sure apple will try to get it in the powerbook.
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