You might need to install this fix http://www.tonymacx86.com/threads/black-screen-with-macpro-6-1-or-imac-15-or-imac-17-system-definition.183113/ to get it working under 17,1. That's what I had to do with my 970, otherwise I was getting no signal going to the monitor.
Jerivalu, just wanted to stop by a say thanks for the guide.
I picked up the UD5 TH and a 6700K on Monday and managed to install 10.11.5 without a problem using your guide tonight. Only extra things I needed to do were to update the bios to F5, and use the AGDPfix.app fix due to me running an...
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