To use all the Alienware M17x R3, R4, R5 & M18x R1, R2, R3 video adapter(s), it is required that you to switch the computer to Discrete mode. When the Alienware M17x R3, R4, R5 (Running an ATI Discrete Video card) & M18x R1, R2, R3 running SLI / Crossfire (Dual Discrete Video cards) or Single ATI GPU, mobile system is running on Integrated graphics card mode, Windows' Device Manager will only show the Intel HD Graphics as the Alienware Mobile current video adapter. It is automatically set, whenever the computer is started in battery mode (not connected to a plugged AC Adapter) and systems equipped with nVidia Optimus Technology (Integrated gpu + 1 Nvidia Discrete gpu).Pressing + (for Alienware M17x R3, R4, M18x R1, R2) and + (for Alienware 14, 17, 18) in the Windows desktop, and restarting the computer when requested.
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