I am a Civil Engineering student and will be using AutoCAD. I already have a RMBP 2.6GHz 512GB 16GB on order but now I am wondering if I should have went for the 2.7GHz processor.
It really wont make a reasonable difference. Don't sweat it, keep the 2.6. You are a student, a lot of other students get by with lesser processors. The i7, is as good as it gets for a laptop and 0.1 GHz difference wont matter.
To answer your question, no, you'll be fine with the 2.6GHz processor. You won't ever see a major difference in performance, other than getting a few extra points in a benchmark.
I think the answer still applies in the sense that your real-world realization of the bump in processor speed would be so minor that I would go for resolution, especially since the resolution would be great for ACAD.
I also study civil engineering (Bauhaus Universität Weimar) we are using Revit (the 3D-Version from AutoCAD using BIM).
I think as student you don't need the 2.6, 2.3 should be enough.
Actually I use a 2.66GHz C2D 2009 MacBook Pro and it can handle Revit and AutoCAD very well. (a lot better than the PCs from the university)
So when you have ordered a 2.6/16/512 - stick with that one, it will be great!
I am a Civil Engineering student and will be using AutoCAD. I already have a RMBP 2.6GHz 512GB 16GB on order but now I am wondering if I should have went for the 2.7GHz processor.
The main factor between going for the 2.3 vs the 2.6 would be the larger SSD- that's why there's such a huge price delta between the base and 'top' trim models. If you don't need the larger SSD, don't get the 2799 config solely for the slightly faster processor.