Hmm I wonder if the dual GPU thing plays into the APU rumour, as in there is an APU with a small integrated GPU plus a separate full GPU. With the APU GPU being used for low power (turn off the big GPU when not in use) as well as GPGPU tasks and additional rendering much like the Cell was used for, devs could run physics on it for example.
I don't really see them putting 2 full GPUs in a console.
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