I actually experienced the exact same issue with my Windows 8 install on an ASRock CoreHT 252B Mini PC, which acts as my HTPC. Probably the same or similar as you, I'm outputting both video and audio ...
A new workaround has cropped up in Nvidia's latest drivers for Kepler GPUs that allows the cards to output to 4K TV displays at 4K@60Hz over HDMI 1.4. This is instead of the 4K@30Hz that they were ...
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