Each time I try to render high resolutions, like here 11500x2160 or 15k, I have a glitch where border are darker (like in the right of the image in red), or buggy and kinda reflect what is around the scene? (left in blue).
Are you running out of memory? When you get near the top of your card, UE will offload things from memory, for better or worse, in an effort to prevent crashing. What high-resolution settings are you using?
Also are you shutting off all screen space effects like lens flares, lumen screen traces, vignettes, auto exposure, local exposure, etc…
I’ve tried to desable those, but sadly still have the same problem.
Regarding memory, (I had a 3090 with 24) and now a 5090 with 32 go. I’m using them all + half of the 32 go of shared memory.
However with a resolution of 7680x2160 things are working fine, also with the 32 go of dedicated fully used and a 8 of 32 go used for the shared.
It’s a very important project for me, still trying to find a solution.