Thank you for providing these specs, @suslik21. I've verified against our system requirements for Assassin's Creed Valhalla that your system meets them, so you shouldn't be encountering any compatibility issues at the very least.
We have been seeing increased reports of crashes with NVIDIA GPUs lately however, so I'm wondering whether you have tested rolling back your drivers and/or performing a clean installation of the latest drivers? You can download them for your GPU from NVIDIA's website here if not, and I would ask that you try this. Could you also let me know whether climbing a different high point in another area of England / Norway has the same effect on your system, or if it is only this one high point at Black Peak?
If it is just the one high point, a video showing the issue and the crash you are seeing would be helpful, if one can be captured using screen recording software. You could also record a video on your mobile phone or another device, so long as the details on-screen are visible.
Thank you in advance for any additional information and/or resources provided, and I hope that you have been having a nice weekend so far!