Sub sampling miss Mach I had a gtx 980 it would only do 4k@30hz on a vizio hdmi2.0 port you need a tv with chroma 4.4.4 ( Samsung LG ) visit rtings.com they have info on what tvs support that chroma
I think you’re right ,I had a similar problem with gtx 980 over hdmi 2.0 on a vizio m4k could only do 4k@30hz because of the subsampling
it doesnt WOrk with Vizio tvsĀ you can only get 30hz at 8 bit color depth
Accornding to Club3d website The adapter does support 4k@60hz at 4.2.0http://www.club-3d.com/index.php/products/reader.en/product/displayport-12-to-hdmi-20-uhd-active-adapter.html
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