dp 1.4

What is the max resolution that Display Port 1.4 (not dp 1.4a) can handle at HDR, 10 bits, at 60 hz? Can it handle 2160p UHD resolution at those specs too? I also want full RGB 4:4:4 chroma sub sampling

Greetings, Suddenly my monitor (LG27GN950) had a black bar on the bottom of the screen. This is how it starter. Did some testing and I found out that the bar vanishes instantly if I lower Hz to 120 or 60. My secondary monitor has no issues (caps on 60Hz anyway). I did change DP cables between...