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Thank you for kindly reply my post. I forgot to mention that the screen display after apple logo boot i saw such as horizontal line transition...i knew that the GPU not recognize properly.

Hi thank you for sharing. I am now running MacOs Sierra 10.12.6 without any major issues with HIS ATI RADEON R7 370 256bit 2GB. I have ever tried on High Sierra but the graphic card memory only 7 MB detected. Do you think it is going to work with your solution? ....many thanks

I solved my ATI- Graphic problem on Sierra using AMD Radeon GPU injector: http://www.insanelymac.com/forum/files/file/413-amd-radeon-gpu-injector-tool/

GA-H170-HD3 DDR4 updated without any issues :thumbup: