Only works on AMD builds (disabled on intel chipsets, I don't recall why) and only on GF8200/8300 integrated graphics chipsets. The AMD 780GM chipset can supposedly do it as well, but it is meant for laptops - the only boards I ever found in my research that had the 780GM were a few MSI's, but I remember calling MSI and they stated the GPU switching (from discrete to integrated and back) was disabled at the BIOS level.
I'll try to find the old build log thread i had about this... ill post back when i find it.
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