For 4k i would advice to go for the 3080Ti instead of the regular 3080.
The performance benefits from the 3090 vs the 3080ti are almost 0. The 3080ti is significantly cheaper.
I have a 3090 myself, but it’s only advantage is really the 24gb vram. Wich no game will ever use. I use mine for 3d rendering so it makes sense. Otherwise i wouldn’t know why anyone would buy it just for gaming.
Just google 3080ti vs 3090 and you’ll find lot’s of info about it👍
The money saved with buying the 3080ti would be better to invest in some proper fast nvme ssd with lot’s of space for your games.