A lot of people have been wondering if Hackintosh works on the X99 Platform. I have successfully setup Yosemite on my GA-X99-UD4 build with dual GTX 970s - both being recognized - along with a 5820k, SSD, 16GB DDR4 of RAM and more.
What's working: Full CPU performance (no power step though), Ethernet, both GTX 970s are recognized with full hardware acceleration (and CUDA support on both GPUs), App store/iMessages etc, all USB ports, all connected storage devices (3 SSDs, 2 hard drives.)...
[SUCCESS] i7-5820k @ 4.3ghz, 2x GTX 970, GA-X99-UD4 Yosemite Hackintosh!
What's working: Full CPU performance (no power step though), Ethernet, both GTX 970s are recognized with full hardware acceleration (and CUDA support on both GPUs), App store/iMessages etc, all USB ports, all connected storage devices (3 SSDs, 2 hard drives.)...
[SUCCESS] i7-5820k @ 4.3ghz, 2x GTX 970, GA-X99-UD4 Yosemite Hackintosh!