As far as I can tell from the Intel website, quite literally the only difference between the two is the base and turbo frequency of 0.4. Everything else is identical. What I'm trying to decide is whether or not the $300 price bump for 0.4 difference is worth the cost. I'm currently using a Macbook Air mid 2013 with a 1.7GHz i7 and 8GM of ram. For the most part I only use Sublime Text, Java for building and running applications, and run an old 3D game that uses the CPU instead of GPU (Oldschool RS if anyone is familiar with it). For the most part I don't tend to experience any significant "lag" with my Macbook Air, however most of the time when compiling source code things tend to run slow for a few seconds. I usually have Safari open with 1-8 tabs. My fan also runs the majority of the time I use it. Also forgot to mention that the reason for considering the NTB is that as you can see from the apps I use, the touch bar would rarely serve a purpose for me. Also the ~10% larger battery and the general online input that the NTB model seems to pull much better battery life than any of the TB models is a pretty big plus for me, and since I already use a Macbook Air as it is, I'm used to the weaker 15w chips.