Hi, Im getting soon a 15"macbook pro, the 330M with 512mb version. I was told that the GPU changes automatically from the intel integrated to the 330M, but I was wondering if I could use JUST the 330M, I mean, to switch off the intel integrated completely . And if I can, can you guys tell me how much of my battery life I will lose ? I am asking this because I went to an Apple store and tried a few 15" new models, and the intel integrated is all way sluggish and choppy. Thank you in advance!