So what's the problem? Full RGB is superior to 4:2:0.
Yea.. but I got 4:2:0 in 'standard'. Just need to switch HDMI with computer on, to another one. Then I get full RGB 4:4:4
Also after 'sleep' mode back from 4:4:4 (after HDMI switch) to 4:2:0.
So main problem is, that I got 4:2:0 instead 4:4:4 (this mode don't even display in option). Before I switch HDMI port on 'live'.