winjer
Member
Here is BG3. Max settings and 1080p and max settings 720p in Lower City in Act 3. It's 100% CPU limited there. RTX 4090+i9 13900K+32GB DDR5 6000MHz.
Absolutely no difference in performance whatsoever. Resolution has no impact on CPU unless there are specific aspects of the rendering tied to it as winjer mentioned. I still don't understand how PSSR will alleviate CPU bottlenecks, but I guess we'll have to wait and see if @PaintTinJr is onto something or not.
I have a suggestion. Use RTSS, and enable the CPU monitoring, per core.
That way we can see exactly the CPU usage at each resolution. On that scene, where the frame rate is identical, regardless of resolution.
My bet is that CPU usage will be very similar.