Good news! My R9 270 work in Hackintosh! Maybe my HD7750 not work beacase it not support GOP EFI 。
When Cover EFI Bootloader Start after select OSX drive , VGA output cursor will blink ,wait about 2 min , will enter Desktop。
new EFI file here
MediaFire
I success boot Windows10 ,and can boot Hackintosh of 10.14 too! this is my configuration file EFIC6220.zip
But there is something not perfect, my gtx750ti/HD7850 has no output ,only AST3200(on board) dose. my CPU E52670 locked on 2.6Ghz.
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