Yep, I've given up! I built a new PC a few months back AMD 5800X CPU, Tomahawk B550 MB, new 3600mhz RAM, new 1440p 240hz monitor etc but still can't play quite a few new games as I've only got a GTX 960, at least it's a 4GB model!
So yeah, this GPU can't even support the latest display port...