Hi All, Perhaps I can borrow your collective genius. Last year I took the plunge and bought a Mac Pro 5,1 and separately purchased a non-flashed (PC version) GTX 1080. After some jiggery-pokery I got everything running just fine on Sierra 10.12.6. All has worked basically pretty well since then. I don't have the boot screen, but it's a great gaming machine under Windows and a decent 2nd workstation under OS X. I am now wondering about upgrading to High Sierra (10.13) but I remember hearing about some caveats/problems with that process. Can anyone give me any advice about the practicality of this upgrade?