Not so fast on the 8k display. Tried it this weekend on my video wall setup (4 x 4096 x 2160 50" displays in a 2 x 2 grid, giving a 100" TV, dual Arc 770LEs). The video cards have no problem whatsoever with doing it. Started out with my standard 8192 x 2160 window, everything ok. Stretched the window to cover half the upper row of screens, giving 8192 x 3290, still no problem. Went for 8192 x 4320 - ran into a “sanity check” that is in place to force the sim to run at 4k and CPU - only rendering. I figure it’s there to prevent Xbox users from having problems if they ever plug their xbox into an 8k display, since they will NEVER be able to do 8k on an Xbox X. And CPU-only rendering is useless at that resolution. Until they fix it to allow the PC version to run 8k AT 8k, the only way to run at 8k will be to lower your video resolution, which kind of defeats the purpose of having 8k in the first place.
Bug report filed earlier today. I doubt many other people have hit this particular bug, since they seem to run at less than 8k x anything.
In the meantime, 8k x 2k is still gorgeous - it’s a wide-screen view that covers twice the normal viewing angle horizontally. Can’t wait to try 16k x 2k when my two 65" side screens are shipped to my supplier, hopefully next week. Then I’ll post screenshots comparing the two - if the sim is capable of 16k output.