Hello, I finally fixed my pc ! I don't know where the problem came from but I had to redo a full reinstallation. All of those are with the last model, now the problem is I'm pushing my pc to the limit. I have 12 Go of VRAM and 64 Go of RAM and I'm using almost all of it. I'm gonna invest into a new card for christmas I guess but until now I'm sticking with this :)
Hope you like it !