You should even be able to do the course on a 1080!
My advice is stick to linux (I’m still running 18.04 and its solid) and you should be in more than good shape doing the course on your 1080Ti. One of the great lessons I got from fastai is how to do more with less … as a matter of fact, I built my open source library and compete on kaggle using a single 1080Ti myself.