[ubuntu] How to enable Nvidia GeForce GT 630M (Switchable) Graphics Card on ubuntu 12.04LTS?

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http://ubuntuforums.org – Hi guys, I got an acer aspire 5755G with Nvidia GT630M optimus technology and want to make use of it as that is my last job to get my acer to a complete ubuntu laptop. As I did some research on it and found that there is no official way to do that and came to know that there are some third-party things to make it work. At present I am only using integrated graphics (Intel HD 3000) and I wanted to check this NVIDIA. As If I did my ubuntu install with integrated graphics, so I didn't get any additional drivers. And also please let me know the PROS & CONS of force using NVIDIA. Could you (Hardware)