As you can see from the title, I am here to make somehow the R7 260x gpu work with OS X Yosemite.
So I need someone who has more experience in this than me to help me somehow to make this card work.
I am also here to test everything you guys suggest to me, and also to test your kexts and files.
In my first attempt I had put my device id to the AMD8000Controller.kext and AMDRadeonX4000.kext.
This gave me 'grey' screen with the mouse showing and I could move it, and the resolution has changed too. But nothing showed up only that grey screen. (now keep in mind, I was using Chameleon Bootlader, becouse this is the only Bootloader that worked for me so far.)
--------- Info about my PC -----------
Motherboard: Gigabyte 970A-DS3P
CPU: Amd FX-6300 3.5Ghz 6 Core
RAM: 8 GB 1333Mhz
GPU: PowerColor R7 260x 1GB GDDR5 OC Device Id: 0x1002 0x6658