Re: GTX 1070 TI FTW2 fan problem
I have this card , on the main bios the Fans don't spinup to 60°c is reach , so I switched it to the slave bios on which the GPU Fan (only) spins at about 15-20% RPM = +/- 600rpm at all times even when not loaded , which just feels "safer" to me especially with high Summer ambient Temps. ( it also allows 130% power target on the Voltage).
However at 80-90° they should both be running hard, so it sound like you need a bios flash at a minimum.....
Asus X99-A II MB with a 5820K at 4.4GHz
32GB Corsair Vengeance Ram @3200mhz
EVGA Nvidia GTX 1070Ti FTW2
Win10 Pro on (3) 32" BenQ BL3200PT Monitors