Thanks for your answer. But as I wrote before I have all the drivers updated 🙂
The problem is that I can't have these FPS problems so low with the same settings I used for the GTX1070
Low FPS problems are often because your system is throttling itself, due to some problem that is overtaxing it. Are your FPS problems right from the get go?
Good to know your drivers are all up to date, but there might be a driver in the works for you (not sure though). In my case very recently I was getting sudden restarts until Asus released a new chipset driver--which solved the problem. This was with a rig with 2080s in it. I was also having no problems running the same game on an older rig with 1070s in it (two in SLI). Also, the same new rig was crashing prior to this on the release of a new game patch (Wow 8.3) that a Windows reinstall fixed (reinstall via Windows refresh tool).
Also, you are having a temperature issue--you mentioned 80 degrees. Is that the temperature of your north bridge or something like that? What are your CPU and GPU temperatures like? Your new card might be structurally different vs your older card. Some cards, like the Asus Turbo cards push heat out the back of your rig, while other ones dump heat into your case. If you are having a heat issue, there are lots of things you can do.