Asus V9999 Series - Manual (Page 47)

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HyperDrive Modes
1. 3D Game mode - In 3D Game mode, ASUS SmartDoctor
automatically sets the GPU clock to its highest possible value when
playing 3D games for better 3D performance. It reverts to its normal
GPU core clock after playing 3D games.
2. CPU Load mode - When set to this mode, ASUS SmartDoctor
dynamically adjusts the GPU core clock depending on the Central
Processing Unit (CPU) work load. ASUS SmartDoctor increases the
GPU core clock when the CPU is busy and decreases it when your
CPU is idle.
3. GPU Temperature mode - In Temperature mode, ASUS SmartDoctor
smartly adjusts the GPU clock according to its temperature. If the GPU
temperature increases, ASUS SmartDoctor automatically decreases
the GPU core clock, and vice versa.