4090 and OLED TV (LG C1 but I don't believe it matters) here as well but I feel like it's not related to the card. It's not that there is odd behaviour or anything, the option just seems to not do anything.
I maxed the brightness in Game Optimizer mode in SDR and it's spectacular either way. Loaded up the XBOX Series S and, even though it has Dolby Vision and it might be slightly brighter in some places (more about the dynamics and diff in bright and dark, but subtle differences), the resolution detracts from the benefit that HDR could provide. And it's smooth, but it's not 100+ FPS smooth. I'll still take PC without HDR over console with HDR, but we shouldn't have to choose for a $90 game. Patch 1.04 didn't seem to fix it.
I did update the VBIOS on the card (which actually seemed to fix the very seldom frame drops I was getting, super buttery smooth now).
The gameplay experience is quite great, imo the best NFS in 10 years or more. Welcome back, Criterion. But please fix HDR on PC!
