Hi broiler010,

When choosing 3840×2160 at 60HZ 4:4:4 the color depth need to go down to 8Bit otherwise the signal gets bigger than what HDMI2.0 has bandwidth for (18Gbps)…
In 4:2:2 the max color depth is 12Bit and in 4:2:0 you should be able to do 16bit