Lenovo G485 Notebook - Manual (Page 34)

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Chapter 2. Learning the basics
About NVIDIA
®
Optimus
TM
(on select models) - - - - - - - - - - - - - - - - - - - - - - -
Optimus is a GPU switching mechanism which automatically switches the
active GPU to perform image-rendering tasks. If no graphics-intensive
programs are running, the integrated GPU will be selected as the active GPU
to preserve battery life; if you start high-definition movie playback or a 3D
game, the image-rendering task is automatically switched by Optimus to the
discrete GPU to produce high graphics performance.
When Optimus is enabled, switching between integrated and discrete GPUs
is performed automatically without user intervention.