![]() I suspect that was because of an EDID problem that could have been in the monitor or the converter. The Samsung monitor I used showed up in the Display Preferences (and About This Mac) as a native 4096 x 2160 monitor, when in fact it is 3840 x 2160 TV/monitor. I used a Kanex KIADAPT4KW,, which accepts DisplayPort 1.2 and outputs HDMI 1.4b compatible 297 MHz pixel rate signals. It can be tricky distinguishing an ACTIVE converter from a passive converter, because some passive converters say they support 4K (they do, but not from an HD 5770 video card), and some ACTIVE converters are not marketed as ACTIVE. It will not output 4K at 60 Hz.Īll that's required is a $30 (perhaps less) ACTIVE Mini Display Port to HDMI converter, and possibly depending on your monitor or converter, SwitchResX, which can be downloaded for free unless you want to pay for some of its additional features. The HD 5770 will output 3840 x 2160 at 24, 25, or 30 Hz with excellent results. I'm not interested in playing video games, just in using a 40" Samsung 4K TV as a monitor for CAD work and viewing some 4K video. For the benefit of anyone else interested in doing it, I'm posting my results here that it does. I'd read conflicting reports about whether it would output 3840 x 2160 4K video, or not. ![]() I wanted an inexpensive way for my 2010 Mac Pro with original stock Radeon HD 5770 video cards to drive a 4K TV as a computer monitor.
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