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4K 60Hz possible on Mountain Lion with AMD 7850?
Greetings. I have a perfectly functional installation of Mountain Lion, however I am having difficulty in getting it to output 4K at 60Hz via DisplayPort 1.2 with my AMD Radeon Hd 7850. 4K at 30Hz works perfectly but as soon as I switch the monitor to DisplayPort 1.2 mode and reboot for 60Hz...