Got myself a RX550 to go with a LG 27UL550 monitor. The monitor is a 4K 60HZ 10bit HDR10 Freesync monitor. I can not run 4K 60hz on RX550, not matter on 8bit or 10bit, 30hz is fine. Borrowed a 5700xt and a RX590, and 4k 60hz works fine on 5700xt but RX590 shows the same problem. My system configuration is as follows:
CPU: Ryzen 3600
OS: Windows 10 19041450 up to date
monitor: LG 27UL550-W
link: DP 1.4
Feels like this could be a driver problem, cuz the bandwith is not the problem. could use some help here.