With both the older NVidia 9400m/9600m, and the newer Intel/NVidia 330m systems, the discreet GPU is the one that is forced on when booting into Windows or Linux.
Some (non-Apple) Hybrid notebooks also work that way. A few even have a BIOS setting to allow the owner to choose (what a concept!). But battery life is bad when running exclusively on the high-power Nvidia GPU.
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