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Hi, My Sapphire r9 290 Dual X works very well on Yosemite but just in 1080p with DVI and HDMI on a native SONY 4K TV. I have patched the kernel kext with clover according to dumps , chose the Baladi Framebuffer and use the ATI fake Id to R9 290X, all done thanks to clover and your advice On Windows 8 I can obtain native 4K resolution using an HDMI cable. Is it normal ? Can I obtain a 4K resolution with DP HDMI adapter using the DP from the graphic card? Thanks