Dual display chips/cards - why?

That's my education only. I see many mfgrs. using both an Intel HD display chip and an nVidia or AMD/smart card. I also see this configuration causing problems with certain Adobe products. My question is, why do double/card configuration smart? For what purposes?

Thanks in advance for the educational responses,

Hunt

Switchable NVIDIA Graphics version is called 'Optimus '. Basically, it works like this the NVIDIA autour drivers sit and wait for an application that use the GPU. Then once an application request 'help' or sending a call siginal for NVIDIA drivers, he wakes up and starts making the required elements. This basically saved way work the battery life as John mentioned and in many cases allows to save a bit of autonomy.

If you really want in depth and easy to understand explanation however I recommend reading this article de.com

vidia-optimus-technology/2 http://www.AnandTech.com/show/4839/mobile-GPU-faceoff-AMD-dynamic-switchable-graphics-vs-n

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