I have been running Forza Horizon 4 on my PC in 4K mode have have noticed a noticeable frame decrease of the last few Nvidia driver release on my 1080 Ti card.
I downloaded the 457.51 driver from the Nvidia page to get back to my previous 70 FPS that it previously was. I am not certain if the new drivers are optimized for the 2000/3000 series cards and this affects the 1000 level hardware cards only.
Hi there!!! In my situation i have a MSI Armor GTX 1080 Ti, i have the latest drivers, version 460.89, and i have no problems, the framerate does not decrease
Thanks for your feedback. I am still having issue of the frame rate dropping to 20 fps with the latest driver in 4K mode. Perhaps the next driver update will resolve this issue.