Can anyone with a 3090 Ti confirm their highest resolutions possible as a result? Looks like I can max out at 768 by 512 on my 2080 Ti. Any examples would be appreciated.
I have a 3090 TI and I was actually going to ask about the same thing in the comments. For some reason it won't use more than like 13 gigs of vram out of my 24, and if I make the resolution bigger than 512 by 768 or something around that it gives the "ran out of vram error" 
Like it says that it tied to allocate 3.7 more but it also clearly says I have 7.9 available.
But honestly 512 by 768 is good enough for me just playing around I don't really mind that much.
Thanks for confirming. Shortly after I ended up reading a ton of articles and it appears it wouldn't matter much anyways, as they were trained at 512x512 resolution to begin with, which makes sense as to limits and images tending to overlap or duplicate when you set the output higher. And you're right, 768x512 is really perfectly fine, I was just curious but knowing more now realize that there wouldn't be much benefit of a 3090 Ti over a 3080 Ti... at least, yet.
2 years ago(+1)
I can do 1080x1080 on the updated version of the GUI using my 8GB 2070 Super, and still have enough VRAM left over to fiddle around in Blender while the GUI does its work.
It's kinda annoying that they're paywalling such big updates, I hope they plan to update the Itch version soon so people don't have to pay $10 a month for access to a bunch of different services they probably wont use, just to get the bugfixes, content, and optimization of the newer versions of the GUI.