1080 gtx issue

i was using a 1060 6gb previously with no problem my psu is a 650w i checked the psu requirements and it says 400 will do it my mb is a asus p6t and my ram is ddr3 1600mhz 24gb 3x8gb im gonna try a few things but if anyone has any idea help is appreciated

Has anybody tried replacing the cooler on an iChill 1080 Herculez (or whatever fancy name they've given it)? One of the fans has had it's bearings give out and it's triggered some strange behaviour in the GPU - the other fan now constantly spins at full whack and is reporting 0 RPM on any...