Finally, after good FPS in borderlands 3 for about 3 minutes ( when the card reached around 90C ) and having the framerate at low setting drop at 20 FPS, i reinstalled my 950. without any driver re-install, change of setting, i'm now gaming at 60 fps in borderlands 3.
I will send the card back with a 1 star review and order another one from a different brands.
Thanks Radium_Angel and Whiro for your help