question regarding 8850m gddr5 and 3D applications

substance-r2d2

New to this forum
Hi,
I am planning to buy dell15r 5537. It has an amd 8850m ddr5 gpu. I am mostly going to work with 3d applications like maya , zBrush and unity3D game engine. I have heard that amd gpu only kicks in when a game is being played and will use intel on board graphics rest of the time. So my question is will I be able to use the GPU for rendering i.e will it switch to the amd GPU???

Also if you have a better recommendation for laptop under 65k it will also be appreciated. :)
 
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