So I'm trying to buy a new laptop w/ a discreet video card, and I've been told to stick w/ Nvidia because of Optimus. Not sure if there's a similar technology with AMD GPUs, as that would open up more options. But anyways, here's my understanding of current Nvidia options in the mobile space and it would be great if someone could tell me what is their equivalent performance to desktop GPUs. GTX 675m = GTX 580m rebadge - top of the line single GPU (not counting the new 7990m) GTX 670m = GTX 570m rebadge - second in terms of performance GTX 660m = Kepler GPU - slightly less performance than 670m due to Kepler cores GTX 650m = Kepler GPU - uses GDDR3 instead of the GDDR5 in GTX 660m . . . and not really interested in anything below a 650m.