Hey! Finally on the road to make everything work on my Mac Pro 5.1 in windows 8.1 at the moment. One thing that is different is of course that you have to install separate SSD drivers compared to OS X. I got two samsung 850 evo's in my system OS X formatted as HFS+ In terms of setup I learned that "TRIM" is pretty important and that you have to manually turn it on in OS X and WIN so that is accomplished. I installed "Samsung Magician" and to my surprise new options showed What are your opinions on "AHCI Mode" and "RAPID Mode" ? ? ? - Are these two functions enabled by default in OS X ? ? ?