I'm considering the 3.8 GHz as opposed to the 3.5 GHz, but if that causes the fans to kick in- or throttle considerably more often than the 3.5 GHz then I'll go for the 3.5 GHz. Intel puts both i7-4850HQ and i7-4960HQ at 47 W max TDP. I know from a friend who has the 3.5 GHz with the nVidia 750M that for low usage like internet browsing the laptop is silent, the fans are off - he has the model with the nVidia card. Anyone can comment on temperature differences between the two models? What about battery life? Many thanks in advance, Alex.