This allows the GPU to always use the minimum amount of power required to run a given application, and can allow even older 3D games to run in lower power modes if the game does not require full 3D performance. The default behavior in R190 drivers ("Adaptive") is for the graphics card to monitor GPU usage and seamlessly switch between modes based on the performance demands of the application. To provide end users with more control over the power management capabilities of the graphics card, NVIDIA has added an option to the control panel to allow users to set preferences for how the driver will switch between these performance levels. These modes can include different GPU/memory clocks for the Windows Desktop (idle), video playback, and 3D applications. Many NVIDIA graphics cards support multiple performance levels so that the PC can save power when full graphics performance is not required.
NVIDIA Control Panel Feature: Manage 3D Settings - Power Management Mode
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