I've also installed Yosemite successfully (only using -x) on a Gigabyte Z87MD3h with an Nvidia GTX660 and 16Gb ram BUT I have NO network OR Sound. neither are detected and i've tried just about every boot option,along with reinstalling and customizing each time according to suggestions in the guide.
It's becoming quite tedious as I don't seem to be getting anywhere.No matter what i try,nothing seems to work, then after a while I get little green squares all over the screen and it freezes. Obviously a graphic issue. I appreciate all the trouble that's put inot an "easy" installation process and it is, compared to past itterations. There's still issues though and it's quite beyond my capabilities.
Any more help would be greatly appreciated