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
1 Club 3D USB-C to DisplayPort Adapter No Signal with Dell XPS 13
2 CAC-1335 1440p 240hz Flickering
3 CSV-1585 only works with < 4k 60Hz
4 Club 3D CAC-1510-A USB C to Dual Link DVI-D Adapter HDCP Off not working
5 Is there a DP2.1 to HDMI2.1 Adapter supporting 4K@144Hz with VRR support?
6 Cheapass Crash Cart Monitor
7 CSV-1583 power managment laptop
8 Mac Pro 2019 (7,1) and Apple Cinema 30
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