A:AnswerYour cable is a DP 1.4 cable, and those are backwards compatible with 1.2 devices, so you should have no issues (also no benefits) to using it over a 1.2 cable.
A:AnswerYou obviously don't understand how resolution works. There is HD (720p) Full HD/FHD (1080p) QHD/2k (1440-1700p) and UHD/4k (2160+). The peak resolution of the monitor is 1440p, which is 2k. It is not capable of 4k. It also will not down convert to 1080p as most blu-ray players will recognize 1440p, but it will down convert to 1440p because the monitor is not capable of 2160p.
A:AnswerIt's a little tricky.. Attach base first, and slide the tabs in. Use the packaging material for stability, because you may need a little force.
A:AnswerI have no idea. My son hasn't taken out of box yet to set it up to his ps5. We are building his room downstairs and wanted to wait until he had the room to set his gaming system up down stairs. I will let you know soon.