The GPU performance state APIs are used to get and set various performance levels on a per-GPU basis. P-States are GPU active/executing performance capability and power consumption states.

P-States range from P0 to P15, with P0 being the highest performance/power state, and P15 being the lowest performance/power state. Each P-State maps to a performance level. Not all P-States are available on a given system. The definition of each P-States are currently as follows:

    P0/P1 - Maximum 3D performance
    P2/P3 - Balanced 3D performance-power
    P8 - Basic HD video playback
    P10 - DVD playback
    P12 - Minimum idle power consumption

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