Gears of Wars 5 running in 8K is too much even for the most expensive gaming GPUs out there. While 4K @60 fps is starting to look "doable" these days, running Gears 5 in 8K at 30 fps is already an impossible task for GPUs like the Titan RTX. 8K displays are not exactly mainstream either, so we might see GPUs properly handling the monstrous resolutions in 2-3 years.
https://www.notebookcheck.net/8K-gaming-we-there-yet-Gears-5-running-in-8K-brings-Titan-RTX-GPU-to-its-knees.435303.0.html