As the owner of an Acer X27 (Acer variant of this monitor), I paid £1750 and it has been worth every penny. A single 2080Ti has been ample to run games at 4K in excess of 100fps. Just depends on the game and how demanding it is. I might be the only one, but I'm voting this hot. It's a fantastic, top of the line panel.
Not at 144hz . Bandwidth required is too much. The next hdmi 2.1? Should be able to
4k is possible yes
Can you even hit these resolutions yet. Even with 2 gpus