Originally Posted By: drakino
Interesting, thats the opposite of how it works on a Mac with dual graphics. 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.

Thats because its not using Optimus. The Mac is using the older system where there is a hardware mux that decides which GPU to use. When you're using Optimus, the integrated GPU is always on no matter what. If the nVidia GPU is turned on then it routes the output through the integrated GPU over the PCIe bus. It doesn't have a direct connection to the output at all.