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Nvidia 580 series of drivers will be the last to support GPUs based on the Maxwell, Pascal, and Volta architectures.
(forums.developer.nvidia.com)
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The 980Ti as stated by the Dirk's comment use Maxwell architecture, I'm not able to find any end of support date on the site, so I'm not sure when they will drop support.
Unfortunately you don't need to wait to see this happens, because it's already happening right now, indeed dx12 games have a lot of problems running on this older cards on linux, and I myself experienced this with my 1060 first with cyberpunk 2077 and after that with resident evil 2 remastered.
As even stated by doitsujin (dxvk creator):
Source: https://github.com/HansKristian-Work/vkd3d-proton/issues/465#issuecomment-744092867
Ah thanks for the reply. That is a shame about DX12, i must have not tried any of these cos i've found all games i pick run great (i mostly play 2D non intensive indie games). I did play some Death Stranding and was very surprised by how well it ran!
I'll go for AMD if i can next time (i've been doing well getting hand me downs from friends who love getting the latest stuff for themselves!)