I am using the Gigabyte Z97X UD5H Rev 1.0 ( old model and) and it is has some gold color, not like the BK all black.
I am also using the nNvdia Driver ( Nvidia GTX 690 X 2 ).
For Ethernet i have selected Intel>AppleintelE1000E V3.2.4.2
I also installed
PCI ethernet TP link TG 3269 some recommend, since in older OS X worked out of the box
this word fine in Yosemite, but not in El Captain.
So i Used Kext Wizard and applied with one file, now it is working fine. in 10.11.5
my build is here that i upgraded to El Capitan 10.11.5
http://www.tonymacx86.com/threads/yosamite-10-10-5-i7-4790-z97x-ud5-gtx-690-tp-link.174761/
If you need to use the Ethernet Killer™ E2200 you need to find a Kext file called
Killer ALXEtherent V1.0.2 ( see attached from Multibeast of My old Yosemite 10.10.5)
I build my PC on Oct 2016, Running Great, not many people use this , only sound issue when you put into sleep mode ( i keep it on all time on)
Again i really appreciate your help ...