New GPU with same memory is OOM

HI,

I replaced my old 1080 TI 12 GB with a 2080 Ti 12 Gb.

But now my GPU (2080ti) is out of memory on the same task my 1080ti was able to do (even if the memory was almost full on the older GPU). And they have the same VRAM.

How can we explain this ? Is there a way to solve this problem ?