Hey Guys !
I've tried what you said.
It was none of that, it was just a heating problem.
I think my gfx is on safe mode while heating grows.
I tried to open my case and it seems to do the trick.
I've tried that because at the beginning it seems to be working at ultra settings and 10 minutes later, drop of fps.
So the settings on ULTRA 1920x1200, AA 8x are ok !
The temperature raised up to 100°C while playing.
Maybe that can help someone !
Anyway thanks guys
