Any RTX 3080 Dlsss 5 user ?

I have a RTX 3080 and tried on assassin's Creed 2 and brotherhood and FPS is very low. On 1080p it's 30fps and in 4k is 12 fps.

There is anyway to combine with dlss classic (upscaled) in order to get more FPS ?

What's your experience with RTX 3000 on DLSS5 ?