Pardeep
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Citing the example of a Hybrid car, nVidia explains that as a hybrid car switches between the gas powered and the electric car engine on-the-fly and uses the most appropriate engine, Optimus Technology does so with a graphics processor. It transfers the workload to the most efficient GPU for that particular task. When the user is playing 3D games, watching videos or any other GPU-based task, the notebook will make use of the discrete 3D card. While doing basic stuff like web browsing, word processing, email; the integrated graphic processor in the laptop is used. nVidia claims this help in increasing the battery life by up to 2 times.
Of course, none of this is new -- laptops such as the Sony Vaio series have been offering hybrid solutions for quite some time now. The nVidia Optimus tech just brings it under a marketing umbrella.
Notebooks with nVidia technology will start retailing shortly. The first few notebooks with the Optimus technology are Asus UL50Vf, N61Jv, N71Jv, N82Jv, and U30Jc notebooks.