Hello friends, I am using Nvidia GeForce GT 555M and using optimus feature then it is not at all worth. Whenever I am trying to work it but not working properly for me and getting fail it with it and if I am trying to work out with old drivers which was been available during time of purchase of laptop. If I am downloading new drivers of the card then it is creating more problems. So I have came to conclusion that optimus is really worth or not. What you people have to say about it and are there anyone who is thinking that it worth then please do tell me about it. Thank you.