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On the latest boards you can have it so it runs the discrete cards on low power and use the cpu graphics in low demand cases, such as windows and browsing.
HOWEVER, power saving is minimal as it never truely powers down your add in cards and its glitchy and crashes a lot.
So I wouldnt bother, turn it off.
3.1 i-Mode
i-Mode provides user with Intel Sandy special features and power saving options when no 3D gaming is used.
To use Lucid VIRTU solution in i-Mode, display must be always connected to Sandy Bridge motherboard video
output.
Note: Display can be also connected to IPG VGA output instead of IPG DVI output.
3.2 d-Mode
d-Mode is provided for demanding 3D gamers to achieve uncompromised 3D performance of discrete GPU
installed in the system. In this mode, Virtu allows user to utilize Intel special features such as trascoding, while
display is connected to discrete GPU.
Note: We recommend you use d-Mode for better 3D performance unless you use Intel Insider feature or the
power saving i-Mode.
If you use Lucid VIRTU solution with SLI / Crossfire feature, please select d-Mode.
We recommend you use d-Mode for Lucid VIRTU solution if your graphics card is equipped with dual
GPUs.
To use Lucid VIRTU solution in d-Mode, display must be connected to discrete GPU installed in the system.
This is missleading, and wrong actually.